Scott & Jeanette Johnson, Kwajalein Unterwater
Info
Palaemon pacificus, Stimpson, 1860
Palaemon pacificus has certainly been observed by many tourists, as it likes to stay in quite shallow waters of up to one meter, the maximum recorded water depth is 25.6 meters.
The shrimp inhabits coastal reefs and brackish water zones and has numerous brown lines and white spots on its body.
This is a separate-sex shrimp species. The sex of adult animals can be recognized by their size - males 3 - 4 cm and females 5 - 6 cm.
Can be kept as a group, preferably one male shrimp with several females. There is a ratio of 1 to 6 females that are continuously pregnant.
Mating always takes place shortly after moulting. After mating, the eggs are clearly visible and the fertilized eggs are released into the open water within 8 days. The gestation period increases or decreases depending on the water temperature. It is not known whether the sexes also develop differently due to different temperatures.
Spring protection
If the shrimp is kept together with fish, it can happen that the shrimp jump out of the tank during feeding because of the fish. If there are no fish in the tank, the shrimps are usually on the bottom. Even smaller gobies from 3 cm cause the shrimps to seek out the upper areas of the aquarium.
Breeding information:
The larvae hatch* after 8 days of this shrimp are approx. 400 µm in size. Large females carry several hundred eggs**. Best way to catch them is with an airlift - LED lamp - filter socks with 200 µm.
The small larvae grow very quickly.
Shrimp larvae swim backwards and mostly vertically from day 1 to day 10
From day 10, the first attempts at bold swimming can be seen.
Day 1 - 400 µm
Day 4 - 3 mm
Day 10 - 8 mm
Day 12 - 10 mm - transformation from larva to shrimp
Day 15 - 10 mm - 12 mm
Day 25 - approx. 15 mm
Density
The shrimp larvae are quite insensitive to density fluctuations - between 1,020 and 1,024 are possible during a water change without major losses. It is only important that the fresh seawater is added very slowly, preferably drop by drop.
Food in the larval stage = Artemia nauplii
Food after transformation = smallest frozen food (lobster eggs and crushed Artemia)
Food from day 20 - frozen food
Synonyms:
Leander okiensis Kamita, 1950
Leander pacificus Stimpson, 1860
Palaemon pacificus has certainly been observed by many tourists, as it likes to stay in quite shallow waters of up to one meter, the maximum recorded water depth is 25.6 meters.
The shrimp inhabits coastal reefs and brackish water zones and has numerous brown lines and white spots on its body.
This is a separate-sex shrimp species. The sex of adult animals can be recognized by their size - males 3 - 4 cm and females 5 - 6 cm.
Can be kept as a group, preferably one male shrimp with several females. There is a ratio of 1 to 6 females that are continuously pregnant.
Mating always takes place shortly after moulting. After mating, the eggs are clearly visible and the fertilized eggs are released into the open water within 8 days. The gestation period increases or decreases depending on the water temperature. It is not known whether the sexes also develop differently due to different temperatures.
Spring protection
If the shrimp is kept together with fish, it can happen that the shrimp jump out of the tank during feeding because of the fish. If there are no fish in the tank, the shrimps are usually on the bottom. Even smaller gobies from 3 cm cause the shrimps to seek out the upper areas of the aquarium.
Breeding information:
The larvae hatch* after 8 days of this shrimp are approx. 400 µm in size. Large females carry several hundred eggs**. Best way to catch them is with an airlift - LED lamp - filter socks with 200 µm.
The small larvae grow very quickly.
Shrimp larvae swim backwards and mostly vertically from day 1 to day 10
From day 10, the first attempts at bold swimming can be seen.
Day 1 - 400 µm
Day 4 - 3 mm
Day 10 - 8 mm
Day 12 - 10 mm - transformation from larva to shrimp
Day 15 - 10 mm - 12 mm
Day 25 - approx. 15 mm
Density
The shrimp larvae are quite insensitive to density fluctuations - between 1,020 and 1,024 are possible during a water change without major losses. It is only important that the fresh seawater is added very slowly, preferably drop by drop.
Food in the larval stage = Artemia nauplii
Food after transformation = smallest frozen food (lobster eggs and crushed Artemia)
Food from day 20 - frozen food
Synonyms:
Leander okiensis Kamita, 1950
Leander pacificus Stimpson, 1860
