EastMed TECHNICAL DOCUMENTS
10
THE PUFFER FISH
LAGOCEPHALUS SCELERATUS (GMELIN, 1789)
IN THE EASTERN MEDITERRANEAN
FOOD AND AGRICULTURE
ORGANIZATION
OF THE UNITED NATIONS
The Puffer Fish
Lagocephalus sceleratus (Gmelin, 1789)
in the Eastern Mediterranean
Prepared by
Manal R. Nader
Shadi Indary
Layal Ephrem Boustany
Hellenic Ministry of
Foreign Affairs
ITALIAN MINISTRY OF AGRICULTURE, FOOD
AND FORESTRY POLICIES
Hellenic Ministry of Rural
Development and Food
GCP/INT/041/EC – GRE – ITA
Athens (Greece), March 2012
i
The conclusions and recommendations given in this and in
other documents in the Scientific and Institutional
Cooperation to Support Responsible Fisheries in the
Eastern Mediterranean series are those considered
appropriate at the time of preparation. They may be
modified in the light of further knowledge gained in
subsequent stages of the Project. The designations
employed and the presentation of material in this
publication do not imply the expression of any opinion on
the part of FAO or donors concerning the legal status of
any country, territory, city or area, or concerning the
determination of its frontiers or boundaries.
ii
Preface
The Project “Scientific and Institutional Cooperation to Support Responsible Fisheries in the
Eastern Mediterranean – EastMed” is executed by the Food and Agriculture Organization of
the United Nations (FAO) and funded by Greece, Italy and EC.
The Eastern Mediterranean countries have for long lacked a cooperation framework as
created for other areas of the Mediterranean, namely the FAO sub-regional projects
AdriaMed, MedSudMed, CopeMed II and ArtFiMed. This made it more difficult for some
countries in the region to participate fully in international and regional initiatives for
cooperation on fishery research and management. Following the very encouraging experience
of technical and institutional assistance provided to countries by the other FAO sub-regional
Projects,
EastMed
was born to support the development of regional cooperation and the further development of
multidisciplinary expertise, necessary to formulate appropriate management measures under
the FAO Code of Conduct for Responsible Fisheries and the principles of the Ecosystem
Approach to Fisheries (EAF) to ensure rational, responsible and participative fisheries
management
The project‟s longer-term objective aims at contributing to the sustainable management of
marine fisheries in the Eastern Mediterranean, and, thereby, at supporting national economies
and protecting the livelihoods of those involved in the fisheries sector.
The project‟s immediate objective is to support and improve the capacity of national fishery
departments in the sub-region, to increase their scientific and technical information base for
fisheries management and to develop coordinated and participative fisheries management
plans in the Eastern Mediterranean sub-region.
FAO – EastMed Project HQ
Androu 1,112 57 Athens
Greece
Tel: +30210 8847960
Fax +30210 8837600
E-mail: Eastmed@fao.org
URL://www.faoeastmed.org
iii
Publications
EastMed publications are issued as series of Technical Documents (GCP/INT/041/EC – GRE
– ITA/TD-00) and Occasional Papers (GCP/INT/041/EC – GRE – ITA/OP-00) related to
meetings, missions and research organized by or conducted within the framework of the
Project.
Occasionally, relevant documents may be translated into national languages as EastMed
Translations (GCP/INT/041/EC – GRE – ITA/ET-00)
Comments on this document would be welcomed and should be sent to the Project
headquarters:
FAO – EastMed Project
Androu 1,112 57 Athens
Greece
Eastmed@fao.org
For bibliographic purposes this document
should be cited as follows:
Nader M., Indary S., Boustany L., 2012. FAO EastMed The Puffer Fish Lagocephalus
sceleratus (Gmelin, 1789) in the Eastern Mediterranean. GCP/INT/041/EC – GRE –
ITA/TD-10
iv
Preparation of this document
This document is the final version of the FAO EastMed The Puffer Fish
Lagocephalus sceleratus (Gmelin, 1789) in the Eastern Mediterranean compiled by
the FAO-EastMed Project (Scientific and Institutional Cooperation to Support
Responsible Fisheries in the Eastern Mediterranean).
Acknowledgements
The authors would like thank Dr. Hatem Hanafy Mahmoud, University of Alexandria,
Alexandria, Egypt; Dr. Panagiota Peristeraki, Hellenic Center for Marine Research,
Herklion, Greece; Dr. Stefanos Kalogiru, Hellenic Center for Marine Research,
Rohdes, Greece; and Dr. Maria Corsini-Foka, Hellenic Center for Marine Research,
Rhodes, Greece for the valuable information they provided for the compilation of this
review.
Special acknowledgement is extended to the Department of Fisheries and Wildlife of
the Ministry of Agriculture in Lebanon and the FAO Representation in Lebanon for
their essential logistical and technical assistance.
Nader M., Indary S., Boustany L., 2012. FAO EastMed The Puffer Fish
Lagocephalus sceleratus (Gmelin, 1789) in the Eastern Mediterranean.
GCP/INT/041/EC – GRE – ITA/TD-10. Athens 2012: 39 pp.
ABSTRACT
In the Mediterranean region, the fisheries sector has been suffering from the
impacts of migration of aquatic organisms through the Suez Canal. Among the
most devastating species to both fisheries and habitats is the aggressive predatory
puffer fish Lagocephalus sceleratus. The fish bio-concentrates Tetrodotoxin
(TTX), a very potent poison making the fish unmarketable and poses a great risk to
human health if consumed. In addition, L. sceleratus has been recorded to destroy
fishing nets and lines leading to economic losses for fishers. The objective of this
review is to describe the status of L. sceleratus and its commercial applications, if
any, around the world with emphasis on the Mediterranean Sea. Given the lethal
TTX toxicity of L. sceleratus, and the strict regulations passed around the world
preventing its fishing and consumption, coupled with the little knowledge available
about its biology and its bio-concentration of TTX, it is not recommended at this
stage to consider marketing the fish to consumers. Even-though the aquarium and
capture-based aquaculture industries may provide partial solutions, the best option
lies in creating, and in association with pharmaceutical companies,
multidisciplinary laboratories in Mediterranean countries with the main objective
of isolating TTX from puffer fishes including L. sceleratus and investigating the
toxin‟s potential use in the pharmaceutical industry. Such an option would create
many employment opportunities in the region, but more importantly, it will create
a fishery that will yield economic benefits to the fishers and control wild
populations through increased fishing pressure. However, such an initiative
requires many investigative activities about the biology of the fish as well as very
strict permitting and regulatory processes in the countries where such a fishery
might be established.
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Table of Contents
1.
INTRODUCTION ......................................................................................................................... 1
2.
CHARACTERISTICS OF LAGOCEPHALUS SCELERATUS .................................................................. 5
2.1
BIOLOGY OF L. SCELERATUS ....................................................................................................... 5
2.2
TETRODOTOXIN ...................................................................................................................... 8
2.2.1 Origin ............................................................................................................................ 8
2.2.2 Chemistry .................................................................................................................... 10
2.2.3 Toxicity of L. sceleratus ................................................................................................ 11
3.
WORLD FISHERIES OF LAGOCEPHALUS SCELERATUS ................................................................ 14
4.
IMPACTS OF LAGOCEPHALUS SCELERATUS AND TTX ............................................................... 16
4.1
4.2
IMPACT OF L. SCELERATUS ON PUBLIC HEALTH .............................................................................. 16
IMPACT OF L. SCELERATUS ON FISHERIES ..................................................................................... 18
5.
LEGISLATION RELATED TO LAGOCEPHALUS SCELERATUS THROUGHOUT THE WORLD ............. 20
6.
COMMERCIAL APPLICATIONS OF LAGOCEPHALUS SCELERATUS............................................... 23
6.1
L. SCELERATUS AS A FOOD ITEM ................................................................................................ 23
6.2
L. SCELERATUS AS A NON-FOOD ITEM ......................................................................................... 24
6.2.1 Potential medical uses of TTX ....................................................................................... 24
6.2.2 Potential Aquarium Use ............................................................................................... 25
7.
RECOMMENDATIONS .............................................................................................................. 26
8.
CONCLUSION ........................................................................................................................... 28
9.
REFERENCES ............................................................................................................................ 29
Table of Figures
Figure 1. Mediterranean Sea (Ozturk, B. 2010) ...................................................................... 3
Figure 2. Distribution range of L. sceleratus (FishBase 2010) .................................................. 6
Figure 3. L. sceleratus (Kolpostrianta - Rhodes, 5-10-2007, Greece, by Stamatis Stamatellos) 7
Figure 4. Strong teeth of L. sceleratus (Daily Star 2011) ......................................................... 8
Figure 5. Molecular structure of Tetrodotoxin (Chamandi et al., 2009) ....................................
Figure 6. Mature ovaries of L. sceleratus (Photo by Marine Resources and Coastal Zone
Management Program-Institute of the Environment-University of Balamand, Lebanon, 2011)
........................................................................................................................................... 12
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THE PUFFER FISH
LAGOCEPHALUS SCELERATUS (GMELIN, 1789)
IN THE EASTERN MEDITERRANEAN
1. Introduction
Increasingly, the breaking by humans of natural barriers is leading to the
spreading of species into ecosystems to which they are alien. This dispersal can
impact native species and the equilibrium of both terrestrial and marine invaded
ecosystems, leading to evolutionary pathways which are not yet fully understood,
(Golani 2011). Much attention is being given to the problem today since these
introductions are one of the most significant threats to ecosystem biodiversity,
structure, and function (Oral 2010). Evidence shows that invasions lead to a decline in
the number of native species, disturbance of certain valuable processes, economic
losses, and to the introduction of diseases and pathogens. In certain extreme cases,
native species can become extinct due to competition with or predation by the
invasive organisms (Oral 2010). Frequently, invasive species are discovered after they
have already been in the new habitat for an extended period of time making it difficult
to determine how the invasion started and when. Apart from this, a species may fail to
establish a viable population in a certain habitat, and therefore the invasion might
never be accounted for (Golani 2010). Lately, the problem of climate change further
complicated the subject of alien species by its uncertain impact on species
distribution, abundance and behavior (Argüelles 2008; Burgiel 2010).Cases in which
species have migrated due to changing surroundings have already been recorded and
correlated to human induced climate change (IUCN 2000).
The Mediterranean Sea is home to numerous invasive marine species where
some of them have already established prosperous populations. These invasives might
have entered through several routes: the Suez Canal, the Gibraltar Strait, ship ballast
water and accidental release, among others. Nevertheless, the Suez Canal is
considered as the major route of migrating indo-pacific species, also referred to as
Lessepsian species, from the Red Sea into the Mediterranean. The opening of these
two different seas to each other, resulted in very significant consequences which were
1
not accounted for when the canal was built. Marine organisms migrated from the Red
Sea into the Mediterranean in relatively large numbers, although migrations do occur
in the opposite direction but on a lower scale. Nonetheless, the Gibraltar Strait, ship`s
ballast water and accidental release remain an important source for the introduction of
alien species in the Mediterranean. In total, the number of alien species has reached
more than 790 in the Mediterranean Sea, with some of the invaders through the Suez
Canal having been very successful colonizers of Mediterranean marine ecosystems
(Galil & Zenetos 2002; Zenetos 2005; Golani & Azzurro 2007; Golani 2010; Oral
2010).
The Suez Canal between the Mediterranean and Red Seas (Figure 1) is
recognized by far to be the foremost path for invasive species, it was built in 1869 in
order to facilitate the trade between Europe and the Far East by the engineer
Ferdinand de Lesseps, after whom the species that migrated to the Mediterranean
were named. The canal, connecting these two hydrographically and biologically
dissimilar water bodies, extends 162.5 km and is relatively narrow and shallow for
most of its length. In view of the fact that sea surface temperatures have been rising in
the last twenty years, it has been suggested that the Eastern Mediterranean conditions
are becoming more and more suitable for the growth, reproduction, and survival of
tropical species, offering the aliens various advantages when competing with native
species (Golani 1998; IUCN 2008; Bernardi et al., 2010; Maiyza et al., 2010). Today,
more than 300 Indo-Pacific species, including fish, macrophytes, and invertebrates,
have entered the Eastern Mediterranean through the Suez Canal. The relatively
shallow water of the Canal with an average depth of around 10 m is considered as a
major physical barrier for the migration of deep water species. Accordingly, most of
the invasive species can be found at depths of less than 70 m in the Eastern
Mediterranean (Peristeraki 2006; Oral 2010; Torcu 2010).
2
Suez Canal
Figure 1. Mediterranean Sea (Ozturk, B. 2010)
The study of the Lessepsian migration presents many advantages to scientists
as the date of the opening of the Suez Canal is known as is the origin of the invaders.
Therefore, extensive research has been, and is still being carried out to monitor the
arrival of invasive species, study their impact on the marine ecosystem as a whole and
to provide predictions. Given that it is predicted that invasions of species of the
Mediterranean will continue and since changes in ecosystems as well as in coastal
fisheries have already been reported, this becomes an ecological and economic issue
which must be addressed and constantly studied and monitored (Bariche et al., 2004;
Corsini-Foka 2005; Corsini-Foka 2006; IUCN 2008; Oral 2010).
Lagocephalus sceleratus is one of the Lessepsian species which has invaded
the Eastern basin of the Mediterranean Sea. It was first recorded in Gokova BayTurkey in 2003, while the previous 1977 record by Mneimné was a misidentification
of the similar puffer fish Lagocephalus suezensis. L. sceleratus has already
established a population which is colonizing new territories of the Eastern
Mediterranean at a relatively rapid rate. This rapid expansion can be easily observed
as the fish had reached the Aegean Sea in 2006, three years after it was reported for
the first time in Turkey in 2003 (Bilecenoglu et al., 2006; Kassapidis et al., 2007;
Carpentieri et al., 2009; Pancucci-Papadopoulou et al., 2011). Today, it is regarded to
be among the worst invasive species in the Mediterranean Sea with a significant
3
impact on the surrounding ecosystem and on the fisheries sector (Zenetos et al., 2005;
Peristeraki 2006; Streftaris & Zenetos 2006; Ozturk 2010). More importantly, L.
sceleratus is considered to be a serious hazard to consumers since it contains a strong
marine toxin called tetrodotoxin (TTX), which can be lethal to humans.
The purpose of this report is to review the biological and ecological
characteristics of L. sceleratus with a focus on the potential commercial use of this
species.
4
2.
Characteristics of Lagocephalus sceleratus
2.1
Biology of L. sceleratus
Puffer fish, blow fish, balloon fish, toad fish, and globe fish, are all generic
names given to several members of the fish family Tetrodontidae, which includes 187
different species worldwide (West 2009; Homaira 2008).
The German scientist, Johan Gmelin, first identified L. sceleratus of the family
Tetrodontidae in 1789. Around the world, many different scientific names are used to
refer to this species: Fugusceleratus, Gastrophysis sceleratus, Gastrophysus
sceleratus, Gastrophysus scleratus, Lagocephalus scleratus, Pleudranacanthus
sceleratus,
Pleuranacanthus
sceleratus,
Spheroides
sceleratus,
Sphoeroides
sceleratus, Sphoeroides scleratus, Tetraodon bicolor, Tetraodon blochii, Tetraodon
sceleratus, Tetrodon sceleratus (FishBase 2004). For the purpose of this report, the
scientific name L. sceleratus adopted by FishBase and by the CIESM Atlas of Exotic
Species is used.
Commonly known as the Silver-cheeked toadfish, L. sceleratus is a widely
distributed species which inhabits the tropical Indian and Pacific Oceans, from which
it originates (Figure 2). Generally, this species inhabits sandy or muddy substrate
areas near shallow coral reefs at depths reaching 100 m. However, it has been also
found living at a depth of 250 m in the Red Sea (Yaglioglu 2011). L.sceleratus
entered through the Suez Canal and rapidly invaded the Eastern Mediterranean Sea
reaching the western part of the basin (Yaglioglu 2011). Sandy bottoms were found to
be very important for the juveniles of this species, while the adults are more common
in Posidonia oceanica meadows. Its relatively rapid spread throughout the
Mediterranean Sea shows that this fish can adapt easily to new habitats (EastMed
2010b; Kalogirou 2011).
5
Figure 2. Distribution range of L. sceleratus (FishBase 2010)
The puffer fish L. sceleratus is one of the largest members of its family,
reaching 110 cm and 7 kg. It has an elongated body slightly compressed at the sides
and similarly to other puffer fishes, it is capable of inflating its body by swallowing
water (Figure 3). This characteristic is common to puffer fishes, which are relatively
slow swimmers and have therefore evolved this ability in order to appear larger to
predators (Takeda 1996). Scales on the body are absent, while only very small
spinules can be observed on its belly and on its dorsal surface. The lateral lines are
easily visible and the body is dark brown with regular blotches on its back, except for
the belly which is white (Bilecenoglu 2006). It has two strong teeth in each jaw which
are capable of ripping and damaging fishing nets and longlines (Figure 4) giving the
family of L. sceleratus its name (tetras= four; odontos= tooth). In the Mediterranean,
this fish was found to be carnivorous, feeding mainly on shrimps, but also on crabs,
fish including individuals of its own species, squids, and cuttlefish (EastMed 2010b;
Aydin 2011). Studies revealed an ontogenetic diet that shifts to a mollusk diet with
increasing size. This can be explained by the shift in habitat from sandy bottoms
where invertebrates are its main preys, to Posidonia oceanica meadows where the
main food items become mollusks such as Sepia officinalis and Octopus vulgaris
(Kalogirou 2011). In addition, interviews with local fishermen along the Lebanese
coast have revealed the opportunistic behavior of this species as it attacks fishes
captured in the nets and lines and seriously damages fishing gears and catch. This
behavior has also been observed in other countries such as Cyprus and Greece
6
(EastMed 2010b). Furthermore, this species accumulates Tetrodotoxin poison through
its diet, which is a non-protein, organic compound, known to be one of the strongest
marine toxins and being 1200 times more toxic than cyanide.
Figure 3. L. sceleratus (Kolpostrianta - Rhodes, 5-10-2007, Greece, by
Stamatis Stamatellos)
Very high densities of this fish were caught during samplings in the Eastern
Mediterranean and it was found to rank among the 10 most dominant species in terms
of biomass (Streftaris & Zenetos 2006; Kalogirou 2010). L. sceleratus has been
reported to have the ability to quickly spread and exploit resources, competing with
the native carnivores. Therefore, the rapid expansion of this species can affect
diversity as well as the abundance of native species in the near future, especially with
changing environmental conditions through climate change since this is expected to
smooth the progress of its adaptation to the new environment (Kalogirou 2010; Aydin
2011). When compared to the expansion pattern of other invasive species and taking
into account that L. sceleratus was recorded for the first time in the Eastern
Mediterranean in 2003, it can be concluded that it is one of the fastest expanding
Lessepsian immigrants up to now (Peristeraki 2006).
7
Figure 4. Strong teeth of L. sceleratus (Daily Star 2011)
2.2
Tetrodotoxin
2.2.1 Origin
The production of Tetrodotoxin (TTX) by marine bacteria has been
investigated since the 1980‟s, with studies focusing mainly on species belonging to
the genus Vibrio and on a lower scale on bacteria of the genus Pseudomonas. Vibrio
bacteria are a genus of aquatic, comma-shaped, very motile bacteria which belong to
the family Vibrionaceae and which can cause many serious diseases to animals. The
most common source of bacteria associated with TTX production is Vibrio
alginolyticus. For instance, puffer fishes, Chaetognaths, and Nemerteans have been
shown to contain V. alginolyticus. To confirm the bacteria‟s role in the production of
TTX, many screening experiments have been done which revealed that 10 strains of
the Vibrio family produce this toxin. TTX is taken up from the food chain, but the
transfer, accumulation, and elimination mechanisms of TTX obtained via preys
remain unclear.
In the past, TTX was believed to be found only in puffer fishes and it was
controversial whether TTX was produced by the fish itself or was accumulated from
the surrounding environment. Several findings, such as the distribution of TTX
8
among other organisms, TTX production by certain marine bacteria, and the absence
of TTX toxicity in artificially reared puffer fish with non-toxic diets later showed and
proved that the toxin is exogenous. Although TTX has been isolated mainly in puffer
fishes, various other species accumulate it, including parrot fishes, toads of the genus
Atelopus, several species of blue-ringed octopuses of the genus Hapalochlaena,
several starfish, an angelfish, a polyclad flatworm, several species of arrow worms,
several ribbon worms, and many species of xanthid crabs. The toxin is variously used
as a defensive biotoxin to ward off predation, or as both defensive and predatory
venom. All TTX-bearing organisms show extremely high resistance to TTX, and
seem to possess TTX as a biological defense mechanism. Nevertheless, the exact
pathway of TTX in the food chain remains unknown, but since the environments of
animals which bear this toxin have no known common factor other than the presence
of these bacteria, these are believed to be the main source of the toxin (Noguchi 2008;
Saoudi et al., 2011).
Several years of research on TTX revealed that toxicity of puffer fishes shows
significant individual and regional variations (Sabrah et al., 2006; Noguchi 2008;
Arakawa 2010). Most studies reported that the liver of many puffer fish species has a
specific TTX uptake mechanism, and TTX introduced into their bodies is first
absorbed in the liver and then transferred to the skin through the circulatory system.
This inter-tissue transfer and accumulation of TTX are greatly affected by the
maturity state of the fish. An alternative explanation is that the toxin is produced by
symbiotic or parasitic bacteria which the puffer fish accumulate inside their bodies
rather than through feeding. Interestingly, the amount of TTX produced by the
bacteria does not account for the accumulation in the fish, which means that bioconcentration occurs in the predator (Katikou et al., 2009; Kalogirou 2010). However,
the exact TTX accumulation mechanisms are still unclear and debatable. The reason
TTX is produced by the bacteria also remains unknown since it has not been found to
be a by-product of any known pathway. Although for the predators of the bacteria the
toxin serves as a defense mechanism, it confers no protection to the bacteria
themselves. However, evidence also shows that the toxin is an end-product of a
biosynthetic pathway rather than a by-product, which means that TTX must have an
important function for the bacteria that still needs to be discovered (Simidu 1987; Do
1993; Matsumura 1995; Noguchi 2008; Arakawa 2010; Williams 2010).
9
De Sousa (2011) stated that TTX has been usually related to the tropics where
most of the species known to possess it are found. However, due mainly to the
Lessepsian migration, this is no longer the case as TTX possessing species have
migrated into other ecosystems. Furthermore, certain studies have shown that there is
a correlation between water temperature and the uptake of TTX by organisms. This
was tested in 2007 on the puffer fish Takifugu rubripes which uptakes TTX into its
liver faster with the increase of water temperature. Other studies were carried out
subsequently, of which the results agreed that organisms uptake TTX producing
bacteria more efficiently and at a faster rate when temperatures increase. For instance,
in 2001, Lagocephalus lunaris, another species of the Tetrodontidae family, was
shown to uptake TTX much faster during warmer months. Even though more
investigation is needed to confirm the relation between toxicity and temperature, it
can be predicted that as temperatures rise globally and specifically in the
Mediterranean, which is very much affected by climate change, the threats which this
toxin poses might increase. When this is coupled with easy migration routes and
breaking of biological barriers, the need for awareness raising and prevention
measures becomes paramount.
2.2.2 Chemistry
Both the chemistry and the structure of TTX (Figure 5) are well known as
many researchers have studied its chemical properties, origins, derivatives, microbial
source, and mechanisms of actions (Bilecenoglu et al., 2006; Chamandi 2009; De
Sousa 2011).
Figure 5. Molecular structure of Tetrodotoxin (Chamandi et al., 2009)
10
TTX is water soluble, heat resistant, and it can be absorbed through mucous
membranes and the small intestine. It inhibits neuromuscular transmission by binding
to the voltage-gated sodium channel, where six binding sites have been identified.
TTX binds irreversibly to site number one, blocking it and preventing the access of
sodium through this channel. Eventually, this toxin leads to the blockage of nerve
conduction and therefore to muscle contraction. High concentrations can also lead to
cardiac and smooth muscle inhibition. TTX is known to be one of the strongest toxic
substances upon ingestion by humans, since it leads to a series of symptoms,
including gastrointestinal symptoms such as nausea, diarrhea, vomiting, abdominal
discomfort, neurological symptoms such as paresthesia in the face, motor incoordination, and muscle weakness. Other symptoms include hypotension, hypoxia,
slurred speech, and tachycardia. Patients remain lucid during the whole intoxication
period (Gosh et al., 2004; Ferreira 2010). No cures for patients who have ingested the
toxin exist, but a study conducted by Kendo Matsumura (1995), found that
monoclonal antibodies can act against TTX. When limpet hemocyanin was injected
into mice prior to being injected by TTX, it acted as an immunogenic and the mice
showed no clinical signs of intoxication. This monoclonal antibody was highly
specific for TTX and had no cross-reaction to its derivatives such as paralytic
shellfish toxin and crude proteins from various organs of puffer fish.
2.2.3 Toxicity of L. sceleratus
Most of the studies found around the world have targeted other species of
puffer fishes, and therefore publications concerning L. sceleratus in particular are
relatively scarce. Most of the studies related to its toxicity were conducted in the
Mediterranean region due to its negative impact on the fisheries sector. Studies in this
region showed that individuals of L. sceleratus in the premature stage with sizes of
less than 16 cm in length usually do not possess enough TTX to be lethal, but that as
an adult, as little as 200 grams of its flesh are lethal to humans (Sabrahet al., 2006;
Katikouet al., 2009; Ali et al., 2011). These observations suggest that this puffer fish,
just like other species, accumulates TTX as a biological defense agent with time as it
matures (Ahasanet al., 2004; Saoudiet al., 2008; Arakawa et al., 2010; Bragdeeswaran
& Therasa 2010; Noguchi 2008; Ali et al., 2011). TTX was found mainly in the
gonads, liver and intestines of this species, but was also recorded on the skin and
11
occasionally in the muscles (Sabrahet al., 2006; Katikouet al., 2009; Ali et al., 2011;
Aydin 2011). The toxin is also present in spawned eggs protecting them from
predation. The ovaries (Figure 6) are reported to be strongly toxic (>1000 MU/g
tissue), the intestines moderately toxic (100-1000 MU/g tissue) while the liver,
muscles and skin are weakly toxic (10-100 MU/g tissue). Moreover, when the fish
encounters enemies, its body swells and TTX is excreted from the skin as a repellant.
In a study conducted in Egypt in 2011 about the toxicity of L. sceleratus, 57%
of the samples examined were toxic, with toxicity varying with size, between organs,
and between sexes. TTX was found in the muscles, skin, liver, ovaries, testis, and
intestines of the fish, with toxicity reaching its maximum values in the gonads, liver,
and intestines. Furthermore, females were found to be generally more toxic than
males and the highest toxicity levels were recorded in March, which led the
researchers to conclude that toxicity starts to increase as the spawning season
approaches. Even though TTX is more concentrated in certain internal organs, the
study revealed moderately toxic muscle tissue especially in spring and summer, which
further confirms the risk this species poses to public health (Ali et al., 2011).
Figure 6. Mature ovaries of L. sceleratus (Photo by Marine Resources and Coastal
Zone Management Program-Institute of the Environment-University of Balamand,
Lebanon, 2011)
12
A study on the biology and toxicity of L. sceleratus (Sabrah 2006) was
carried-out in Egypt in the Gulf of Suez between 2002 and 2003 of which the results
showed that toxicity increases as the individuals mature and their gonads develop.
The most toxic fish were found to be in their spawning stage during the months of
April, May, and June. Out of all the fish examined, 24% were found not to be toxic,
32% were weakly toxic (10-100 MU/g tissue), 20% were moderately toxic (100-1000
MU/g tissue), and 24% were strongly toxic (>1000 MU/g tissue). A study on the
toxicity of this species held by Katikou et al. near the Rhodes Island in 2009 where
the internal organs, muscles and skin were tested for TTX obtained similar results to
the two previous studies.
13
3.
World fisheries of Lagocephalus sceleratus
Several puffer fish species have been consumed for centuries in certain Asian
countries where they are considered a delicacy and where they are prepared by certain
trained and licensed chefs who know how to serve the non-toxic parts. For instance, in
Japan, there are several different types of puffer fishes, locally known as Fugu, which
are labeled as edible (Takeda 1996). Since not all puffer fishes are toxic while others
are mildly toxic means that they can be consumed safely. Furthermore, toxicity
changes with age, sex, season, and geographical variation (Homaira 2008). The
species which contain toxic organs are consumed in certain countries, where they are
sliced in such a way as to separate the toxic organs and fast enough as to not allow the
toxin to penetrate into the flesh. The chefs who prepare Fugu dishes are required to
obtain a license by passing an official exam which can be taken in Japan (Magina
1988). However, although many species of puffer fish are economically important for
the fisheries of the countries where they are consumed, L. sceleratus in particular, is
not among the commercial species due to its high toxicity. Therefore, it is considered
as a non-edible species and its consumption poses a great risk to the public.
In the Mediterranean, this invasive species, is being caught as by-catch in
relatively significant numbers, has no actual economic value and is therefore directly
discarded at sea (EastMed 2010a). Recently, several studies around the Mediterranean
have been targeting this species given its negative impact on the fisheries sector. For
example, in a study carried out in Cyprus from 2009 to 2010, landings data on L.
sceleratus were collected from artisanal fishers and it was found that it represented
4% of the weight of the total artisanal catches. It was also found that this species
inhabits mainly warmer areas in the South-East coast of Cyprus and that it is not
affected by the seabed bottom type. It was concluded that this fish has been able to
successfully establish itself due to its rapid growth, reproduction at an early age,
adaptation ability, absence of predators and/or competitors, and the fact that it is not a
targeted species. Fishers have had to change their methods and gears of fishing and
even their fishing grounds in order to reduce the negative impacts of this invasive on
their livelihoods (EastMed 2010b).
14
A thorough search for information related to L. sceleratus revealed a lack of
publications and reports that address the fishery of the species. This particular fish
was never a very important subject for scientific research since in its native areas it
possesses no market value and therefore it is of no particular interest. Most of the
articles are about puffer fishes as a group or about a few species of economic interest.
However, this species was put under the microscope recently by scientists around the
Mediterranean where L. sceleratus is a new Lessepsian and is considered as one of the
worst invasives (Streftaris & Zenetos 2006). Several scientists have launched field
assessments to better understand its biological and ecological characteristics. These
investigations that require partnerships with the fishing community are facing a
number of challenges since in some cases, fishermen are not able to accurately
identify this specific species and differentiate it from others. In addition, landing data
is hard to obtain as several countries banned its fishing, landing and trade (Kalogirou
2010).
15
4.
Impacts of Lagocephalus sceleratus and TTX
As previously mentioned, few studies on the biological characteristics,
behavior, and toxicity of L. sceleratus were held worldwide. Since its invasion of the
Eastern basin of the Mediterranean, it has posed a serious challenge from an
ecosystem and fisheries perspective as well as from a health point of view for
consumers (IUCN 2000; Galil 2002; IUCN 2008; Oral 2010).
4.1
Impact of L. sceleratus on public health
There have been many cases of human intoxication due to the ingestion of
several TTX-bearing puffer fish species, mainly in Japan, China, and Taiwan where
they have been historically consumed, and where several victims have died (Arakawa
2010; Bragdeeswaran & Therasa, 2010; Monaliza & Samsur 2011). This risk is now
also present for consumers in the countries of the Mediterranean where several
invasive puffer fish species are now present (Chamandi 2009; Kalogirou 2010). TTX
is not destroyed by heat while cooking the fish and intoxication cases are mainly due
to lack of awareness among consumers, misidentification of species or due to
erroneous traditional conception of detoxification methods. The severity of the
intoxication depends on the amount of TTX ingested and death usually occurs after
six to twenty-four hours in 60% of the cases, but can even occur after seventeen
minutes in certain situations (Aydin 2011). The minimum lethal dose for a 50 kg
individual has been estimated to be 10 000 MU (2 mg of TTX), but this may vary
depending on the age, health, and sensitivity of the person, and therefore does not
apply in all cases. In addition, and since the concentrations of TTX differ among
different fish, it is very hard to determine one standard dose. Immediate gastric lavage
is needed after four hours of ingestion, followed by symptomatic and supportive
treatments, activated charcoal, saline cathartic, and clinical care for some time (Haque
2008; Ferreira 2010). However, there is no fundamental treatment which eliminates
the toxin completely from the body (Arakawa 2010) and no antidotes or antitoxins
exist for TTX. If a patient is seriously intoxicated, the only treatment which is
available is artificial respiration until the body detoxifies itself.
16
In several Asian countries where puffer fishes are consumed, TTX poisoning
is the most commonly reported fish poisoning (Chua 2009). In Japan, even though it
has been known for years that the liver, which is commonly known as „kimo‟, is very
toxic, some individuals dare to consume it. The intoxication cases have been
decreasing with time, with puffer fish poisoning constituting 12.5% of all food
poisonings in 1890, 16% in 1895, 20% in 1900, 12% in 1905, and 4% in the1950s. By
the year 2000, this number had decreased to 2%. The first data published by the
Japanese Ministry of Health was in 1952 when it was recorded that 73% of poisonings
happened at home and 15% in restaurants, with the rest occurring in hotels and even
hospitals. Even today, more than three-fourth of the cases occur at home (West 2009).
These results of frequent cases of poisoning has led the Japanese Ministry of Health
and Welfare (http://www.mhlw.go.jp/english/) to publish a list of edible puffer fishes
in 1983 excluding L. sceleratus. This list was updated in 1993 and 1995, where the
liver of all puffer fish was banned from being sold in the market or served in
restaurants. Regardless of the fact that only trained and licensed cooks have the right
to prepare the fish in Japan, still cases of poisoning occur due mostly to its preparation
by uncertified handlers (Ahasan 2004; Chamandi 2009). A 2002 publicized case in
Bangladesh reported that thirty-seven patients of eight different families were all
suffering from TTX induced symptoms. They had all bought puffer fish from a
market in their village and none of them was aware of the risks. Eight out of the
thirty-seven patients died within a few hours and the cause of death was declared as
respiratory muscle paralysis which led to respiratory failure (Ahasan 2004).
Regarding L. sceleratus, it is listed among the 22 toxic puffer fishes in Japan, where it
is commonly known as Okinawafugu, and where its consumption is completely
banned (Arakawa 2010). Also in Malaysia, where L. spadiceus and L. lunaris are
consumed, the consumption of L. sceleratus is illegal due to several cases of severe
intoxication (Monaliza & Samsur2011).
In the Mediterranean, several cases of poisoning have been recorded as L.
sceleratus is marketed regardless of the risk it poses to public health. Its large size
might be one of the reasons behind this species being sold. There have already been
13 recorded cases of death in the Eastern Mediterranean as well as other cases of
intoxication (Chamandi et al., 2009; Kalogirou 2010). From the time L. sceleratus
settled in the Mediterranean, it is being sold and consumed in Egypt, where it is now
17
considered a delicacy irrespective of its ban by Egyptian law. In Turkey, where
landings have also been banned, fishers still sell it illegally and Turkish fishers readily
consume it (Aydin 2011). Moreover, this species is also consumed in Lebanon by
some fishers and a small number of consumers ignorant of the health threats it poses
where several cases of unofficial intoxication have been reported in that country after
eating L. sceleratus. The only official record was in 2008 when a 68 year old woman
complaining of limb weakness and dyspnea was brought to a hospital in Beirut. The
family revealed after questioning that she had eaten a half-cooked liver of L.
sceleratus (Chamandi et al., 2009). Even though in that particular case the woman
survived, the local media records seven cases of death in the past few years in
Lebanon due to consumption of puffer fishes. As a result, the Lebanese authorities
banned in 2011 the fishing, selling and consuming of all puffer fishes including L.
sceleratus. Fish consumers in the Eastern Mediterranean are becoming increasingly
concerned about the availability of those fishes in the market since it is hard to
separate small-sized individuals from other commercial species of the same size
resulting in accidental consumption.
4.2
Impact of L. sceleratus on fisheries
No real, scientific assessment to evaluate the direct impact of L. sceleratus on
the fisheries sector in the Indo-Pacific region where this species is native was found.
Its damage to fishing gears was mentioned in several un-official reports, but it is
presumed that its impact in those areas is minimal since it is part of the ecosystem.
According to Kalogirou 2010, it is agreed that the socio-economic impact of
this alien species on the local fisheries of the Eastern Mediterranean countries is
significant. Complaints from local fishers have become frequent in Egypt, Lebanon,
Cyprus, Turkey and Greece amongst others where the destruction of nets due to
entangling or to predation by L. sceleratus on already entangled fish is common
(Kalogirou 2010). L. sceleratus is considered a major nuisance by fishers since it
damages fishing gear by attacking fish caught in nets and lines, along with reducing
local stocks of squids and octopus through predation. This species can easily cut lines
and nets using its strong teeth (Figure 4). All of the above is affecting the well-being
of the fishing community by increasing the time spent fishing, the mending and
18
replacing of damaged gears and cleaning nets from puffer fishes and their remains.
One example of this species‟ impact comes from Fethiye Bay in Turkey, where after
five minutes of recreational fishing, three fishing lines were broken, ten hooks went
missing, and a L. sceleratus weighing 1 kg was captured. In one study, 52 long-line
hooks were found in 33 stomachs of these fish and with the time spent to clean the
gears from discarded fish, the negative impact was even higher. Furthermore,
reductions of commercial catches of Sepia officinalis, which can be related to the
presence of L. sceleratus have been observed (Kalogirou 2010).
Fishers in Cyprus have been facing the same problems and have already been
forced to modify their fishing techniques and habits (EastMed2010b). Similarly,
Lebanese fishers are complaining from the damage caused to their gears and their
catch. Some have already started adding a metallic wire at the end of their fishing
lines to prevent the fish from biting through them therefore reducing the loss of hooks
and weights. On the other hand, fishing net material has not yet been modified and it
is not clear if other net manufacturing techniques will reduce tearing. When it comes
to pot users, complaints reveal that this species either eats the catch or keeps fish
away from entering the pots. For all of these reasons, and the fact that it is not
marketable, L. sceleratus has established itself as a major nuisance due to the costs
incurred to replace lost gear, repair existing ones, and to the additional effort required
by the fishers to land a catch of commercial value. These facts call for immediate
action. Already, Turkish, Greek, Cypriot, Lebanese and Egyptian Ministries of
Agriculture as well as others, have banned the fishing and selling of this species.
However, additional measures are needed to develop plans and approaches which
decrease L. sceleratus impacts on fisheries. Preventive measures include fishing in
deeper grounds (>60 m), attaching the hooks to steel lines to prevent their loss to
biting, as well as producing nets with stronger and more resistant material (Kalogirou
2010).
19
5.
Legislation related to Lagocephalus sceleratus throughout the
world
Intoxication due to consumption of puffer fish species is well recognized and
the reasons are known worldwide. Therefore several governments have already
banned or restricted the consumption of any products related to puffer fishes. In
addition awareness campaigns are being launched in several countries to expose the
threat of this species to consumers but illegal consumption still occurs and therefore
intoxication risk still poses a serious threat. Nevertheless, several countries still show
lack of regulation and awareness increasing the risk of exposing their consumers to
TTX.
In Japan, the government collects data about Fugu poisoning from physicians,
who are required to report every case. It was in 1947 that the Food Sanitation Law
#37 was passed, which provided that “No person shall sell, handle, manufacture,
import, process, use, prepare, store, or display with intent to sell any food . . . [that]
contain[s] or bear[s] toxic or injurious substances. . . provided, however, that this
provision does not apply to the cases which are prescribed by the Minister of Health,
Labor, and Welfare as not injurious to human health.” In 1958, another law was
passed which require cooks to obtain a license in order to be allowed to serve Fugu.
Today, the Japanese Criminal Code can provide a fine or up to five years of
imprisonment for serving puffer fish without a license and causing a death or injury
(Noguchi & Arakawa 2008; West 2009; Arakawa et al., 2010). In addition, puffer fish
imported to Japan requires a sanitary or health certificate which food sanitation
inspectors must examine to make sure it complies with the Food Sanitation Law. Fugu
may be imported either unprocessed or gutted (as long as the identification of each
fish is not impaired). Fish must be tagged with an official certificate from the
exporting country identifying it by scientific name, fishing ground, and attesting to the
fact that it received proper sanitary handling. If the fish is frozen, it must have been
deep frozen and stored at a temperature below -10 °C. In addition, each fish should be
individually frozen for easy identification. If this is not possible, fish may be frozen in
blocks, but each fish's back and belly must be visible for species identification. If
20
official certificates are incomplete or detached, or if the cargo is mixed with other
species restricted from import, the cargo may be returned to the exporter. Imports of
the same or other Fugu species harvested in other waters must be negotiated with the
Japanese Government to determine certificates of toxicity, fishing ground, species,
etc. (Ababoush 2005; Noguchi & Arakawa 2008).
In Thailand, puffer fish imports, exports, and production were completely
banned in 2002 after six cases of death in that year due to puffer fish poisoning.
According to the Health Minister Sudarat Keyuraphan in 2003, "differentiating
between properly cleaned puffer fish and toxic puffer fish is too difficult; therefore a
complete ban is the only solution to the problem". The Food and Drug Administration
created teams of people which inspect fish markets and restaurants in Thailand. Those
who fail to comply can be either fined or imprisoned for up to two years. However,
illegal selling of this fish still occurs (The Age 2003).
In 1989, the Food and Drug Administration (FDA) in the United States, after
four years of negotiations, reached an agreement with the Japanese Ministry of Health
and Welfare to allow the import of puffer fish from Japan under certain conditions.
The agreement permitted only the import of the meat, skin, and testicles of tiger
puffer fish (Takifugu rubripes or torafugu), which must be prepared in a specific
facility and certified. In addition, this product can be sold only to restaurants which
belong to the Torafugu Buyers Association. In case puffer fish are imported into the
US by a country other than Japan or by Japanese which are not complying with the
terms of the 1989 agreement, the individuals involved become subject to the FDA
Import Alert #16–20, which allows for their detention. In Canada, imports of L.
sceleratus and puffers of the family Tetrodontidaeare are prohibited by the law for
“Regulatory Requirements for Fish Import License Holders”, section 4.2.1
(www.inspection.gc.ca).
According to Corrigendum Regulation (EC) No 854/2004 of the European
Parliament of the Council of 29 April 2004 poisonous fish belonging to the
Tetrodontidae family are not placed on the market in Europe. This regulation laid
down specific rules for the organization of official controls on products of animal
origin intended for human consumption (http://eur-lex.europa.eu). In Lebanon, the
21
Ministry of Agriculture issued a decree in July 2011 (Ministry of Agriculture,
Lebanon, Decree 676/1) which bans fishing, selling and consuming L. sceleratus. In
Turkey, the Ministry of Food, Agriculture and Livestock issued a ban on the fishery
of L.sceleratus (Bilecenoğlu 2012) and the Egyptian, Cypriot, and Greek governments
have all banned the fishing and selling of puffer fishes (Kalogirou 2010).
22
6.
Commercial applications of Lagocephalus sceleratus
L. sceleratus is considered a highly toxic species and therefore it is not
targeted for human consumption even in the countries where other species of puffer
fishes are being consumed. Consequently, it is not landed on the world markets as a
commercial species and does not have any economic value.
6.1
L. sceleratus as a food item
Puffer fish species have been shown to become non-toxic when their diets are
TTX-free and when they are bred in an environment where the organisms which bear
TTX are not present in the food web. These farmed fish are fed with food composed
of sardines and mackerel considered free of the Vibrio bacteria that is usually found in
their natural diets (Arakawa 2010). Of the tens of thousands of tons of Fugu that are
consumed each year in Japan, many come from farms, where the fish are not allowed
to incorporate the toxin through their diets. The farmed puffer fishes are fed fresh fish
until they reach market size. Aquaculture of several species of Fugu is practiced in
Japan as full-scale farming by artificial insemination but no references to the farming
of L. sceleratus in particular were found. It can be assumed that due to its high
toxicity and absence of any economic value, this species is not among those which are
cultured (Yang 2007; Takeda 1996). In the Mediterranean, farming of puffer fish is
not practiced.
As previously stated, the different internal organs of L. sceleratus and even its
muscles and skin may contain lethal doses of TTX. Nevertheless, several studies have
revealed that younger specimens (Total Length < 16cm) contain low amount of TTX
or even no toxin at all (Sabrahet al., 2006; Saoudiet al., 2008; Katikouet al., 2009;
Simon et al., 2009; Ali et al., 2011). L. sceleratus individuals range from not toxic at
all to strongly toxic and this difference is dictated by size, with smaller individuals
being less toxic than large ones and with toxicity increasing with age (Section 2). As
much as 24% of the individuals studied by Sabrah (2006) belonging to maturity stage
I & II (<16cm) were too young to contain any toxin. Those results were corroborated
by the study held by Katikou (2009) that also showed that individuals of maturity
23
stage I & II were not toxic. Further investigations are therefore needed in the
Mediterranean in order to determine the exact size range at which toxicity becomes
lethal in the various organs. If, and only if, a certain range can be identified as nontoxic, then several initiatives for commercial use can be foreseen. In this way, a
capture based aquaculture industry and/or a fishery can be established where juveniles
are harvested and commercialized.
6.2
L. sceleratus as a non-food item
Based on the Japanese regulations, which are considered as the most elaborate
regarding puffer fish species consumption, L. sceleratus is labeled as a non-edible fish
due to its high toxicity. Nevertheless, this species can have certain commercial
applications mostly due to its characteristic of accumulating high TTX concentrations.
Several initiatives isolated TTX from puffer fish species and evaluated the potential
commercial applications of the toxin. It is assumed that the same will apply to L.
sceleratus.
6.2.1 Potential medical uses of TTX
TTX, which is a particular sodium channel blocker, can play a very significant
role in neurophysiology and in other fields as a research reagent (Bhakuni & Rawat
2005; Noguchi 2008). Several researchers have conducted studies to evaluate the
analgesic activity of TTX for cancer patients. The results showed that TTX can be
used as an effective pain reliever. It relieved severe, treatment resistant cancer pain in
the majority of the patients involved in the studies. In addition, blocking of fast Na+
channels has potential medical uses in treating some cardiac arrhythmias.
Furthermore, TTX has proven useful in the treatment of pain from such diverse
problems as migraines, neuralgia, rheumatism, and heroin withdrawal (Matsumura
1995; Schwartz et al., 1998; Dewick 2002; Sowerbutt 2004; Stummann 2005; Hagen
2007; Matsumoto & Tanuma 2009). Given the proven benefits of TTX in the
pharmaceutical industry, the establishment of laboratories in East Mediterranean
countries by interested companies for the purification and subsequent use of the toxin
in the pharmaceutical industry can be considered. Eastern Mediterranean countries
24
could then establish a fishery for L. sceleratus specifically oriented towards the
pharmaceutical sector. Such an option would create many employment opportunities
in the region, but more importantly, it will create a fishery that will yield economic
benefits to the fishers and control wild L. sceleratus populations through increased
fishing pressure. Countries nevertheless would have to introduce very strict legislation
to ensure that the fish caught is not landed on the market nor consumed in any way.
6.2.2 Potential Aquarium Use
Puffer fishes are commonly used in aquariums all around the world, regardless
of their toxicity. Since they are increasing in number in the Eastern Mediterranean
region and are spreading rapidly, it would be relatively easy for fishers to catch them
in large enough quantities for the aquarium trade. The fish could be caught at any size
according to market demand and would become available for household tanks.
Nevertheless, this is not considered to have a significant impact on the wild
populations of L. sceleratus. As in the pharmaceutical industry trade, strict regulations
and monitoring are necessary to ensure that the public health is not endangered.
25
7. Recommendations
Given the lethal toxicity of L. sceleratus, and the strict regulations passed
around the world preventing its fishing and consumption, coupled with the little
knowledge available about its biology and its bio-concentration of TTX, it is not
recommended at this stage to consider marketing the fish to consumers. Even though
juveniles do not appear toxic, allowing their consumption will pose unnecessary risk
to consumers given the difficulty in monitoring landings an enforcing size limits.
Nevertheless and as extensively described in the report, L. sceleratus poses threats on
several levels in the Eastern Mediterranean countries and therefore potential solutions
to the problem should be explored. Even-though the aquarium and capture-based
aquaculture industries may provide partial solutions, the best option lies in creating,
and in association with pharmaceutical companies, multidisciplinary laboratories in
Mediterranean countries with the main objective of isolating TTX from puffer fishes
including L. sceleratus and investigating the toxin‟s potential use in the
pharmaceutical industry. Such an option would create many employment
opportunities in the region, starting with the fishers, passing through the
chemist/toxicologist to the medical researchers and ending with the use of the toxin in
everyday medical treatment. More importantly, these laboratories will create a fishery
that will yield economic benefits to the fishers and control wild populations through
increased fishing pressure. However, such an initiative requires very strict permitting
and regulatory processes in the countries where such a fishery might be established.
Currently though, much more information is required about the biology and
ecology of L. sceleratus and its bio-concentration of TTX before action is taken.
Based on the reviewed literature, the following is recommended for the Eastern
Mediterranean:
Initiate investigative studies on the biology and population dynamics of L.
sceleratus.
Evaluate the impact of L. sceleratus on ecosystem health and equilibrium.
Establish the concentrations of TTX in the different organs and tissues of,
and according to the size of L. sceleratus.
26
Investigate the mechanisms regulating the bio-concentration of TTX in the
organs and tissues of L. sceleratus.
on the world market.
Assess the economic value and potential of TTX as a pharmaceutical agent
Develop resilient fishing lines and nets to withstand the biting power of L.
sceleratus to minimize economic losses to the fisherman.
Identify the best techniques, fishing areas and period of the year where the
fishers can maximize his/her catch of commercially valuable species and
reduce the by-catch of L. sceleratus.
Create a forum where scientists, fishery managers, fishers and the
community at large can exchange knowledge and share experiences related
to L. sceleratus.
Launch awareness raising campaigns targeting coastal Mediterranean
communities on the identification of L. sceleratus and its risk to public
health.
27
8. Conclusion
L. sceleratus is expected to have significant economic, ecological, and social
impacts on Eastern Mediterranean countries. This calls for extensive attention and
intervention, be that on the scientific, adaptation and/or mitigation levels. The scarcity
of research conducted to date on L. sceleratus requires tackling the issue from a socioeconomic as well as an ecological perspective. Solutions for reducing the negative
impacts of this Lessepsian migrant are available, but a better understanding of the
biology and ecology of the fish including the potential commercial use of TTX is
required. Needless to say, Lessepsian migration is not only expected to continue but
to increase in intensity as a result of climate change. The impacts of such migrations
are expected to increase. Identification and monitoring of invasives at an early stage
will better prepare fisheries managers to come-up with preventive/adaptive measures
and possibly economic uses for the new migrants. Furthermore, an action plan
developed and endorsed by Mediterranean countries should be formulated to
minimize, if not eradicate, the entry of invasive species arriving from the Red Sea
within the Canal itself and before they establish viable populations in the
Mediterranean.
28
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33
Beneficiary countries
Countries with waters included in the GFCM
Geographical Sub-Areas (GSAs) 19-20 and 22-28
Donors
Greece
• Ministry of Foreign Affairs
• Ministry of Rural Development and Food
Italy
• Ministry of Agriculture Food and Forestry Policies
European Community
• Directorate General of Maritime Affairs and Fisheries (DG-MARE)
Hellenic Ministry of
Foreign Affairs
ITALIAN MINISTRY OF AGRICULTURE, FOOD
AND FORESTRY POLICIES
Hellenic Ministry of Rural
Development and Food
FAO – EastMed Project
1 Androu str. 112 57 Athens Greece
Tel: +30 210 8847960 Fax: +30 210 8837600
E-mail: Eastmed@fao.org http: //www.faoeastmed.org
Manal Nader