Guppy and photo by Igor Dusanic

Same fish but exposed to different source of light,
different camera angle
and only 30 sec. for changing light and shooting!

Guppy and photo by Igor Dusanic

Guppy and photo by Igor Dusanic

Guppy and photo by Igor Dusanic

Guppy and photo by Igor Dusanic

Guppy and photo by Igor Dusanic

For more information on this subject, click on the link down below;

– Guppy Colouration by Mary Jane

COLOR CHANGE

Color change in fishes can be roughly divided into two categories:

• physiological color change
• and morphological color change.

Physiological color change is considered to be more rapid and consist of motile chromatophore responses, while morphological color change consists of the density and morphology of chromatophores changing.

Overall, morphological color changes are considered to be a “physiological phenomena involved in the balance between differentiation [of melanophores] and apoptosis of chromatophores” but are still being studied; that is to say it has to do with the synthesis of pigment. The genetic factors behind natural morph variants of color in fish are still mostly undiscovered. Some hormonal factors of morphological color change in fish include α-MSH, prolactin, estrogen, noradrenaline, MCH, and possibly melatonin. Some of these are also involved in physiological color change. In physiological color change, there is also neurohumoral regulation of chromatophores in fish. Additionally, there have been found to be “differences at the intracellular level where fish chromatophores show smaller, better coordinated, and higher speed of the pigment organelles” in comparison to color-changing frogs.

References;

• Sugimoto, Masazumi (2002). “Morphological color changes in fish: Regulation of pigment cell density and morphology”. Microscopy Research and Technique. 58 (6): 496–503. doi:10.1002/jemt.10168. ISSN 1097-0029. PMID 12242707.
• Heflin, B.; Young, L.; Londraville, R. L. (2009). “Short-term cycling of skin colouration in the blackspotted rockskipper Entomacrodus striatus”. Journal of Fish Biology. 74 (7): 1635–1641. doi:10.1111/j.1095-8649.2009.02200.x. ISSN 1095-8649. PMID 20735660.
• Henning, Frederico; Renz, Adina Josepha; Fukamachi, Shoji; Meyer, Axel (May 2010). “Genetic, Comparative Genomic, and Expression Analyses of the Mc1r Locus in the Polychromatic Midas Cichlid Fish (Teleostei, Cichlidae Amphilophus sp.) Species Group”. Journal of Molecular Evolution. 70 (5): 405–412. Bibcode:2010JMolE..70..405H. doi:10.1007/s00239-010-9340-4. ISSN 0022-2844. PMID 20449580.
• Sköld, Helen Nilsson; Aspengren, Sara; Wallin, Margareta (2013). “Rapid color change in fish and amphibians – function, regulation, and emerging applications”. Pigment Cell & Melanoma Research. 26 (1): 29–38. doi:10.1111/pcmr.12040. ISSN 1755-148X. PMID 23082932

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