Most fish have a range of wavelengths which they respond to (e.g. see electroretinography studies by researchers at the Virginia Institute of Marine Science):
http://www.vims.edu/people/latour_rj/pubs/rjl_Horodysky_et_al_2008a.pdf
Some fish have two regions (bimaxwellian) of peak response within the range of wavelengths that they respond to, while most seem to only have one (a Maxwellian distribution). I suppose this has to do with evolution and how they have adapted to their habitat (e.g. standing/flowing fresh vs salt water, depth of preferred temperature), predators and prey, etc. I am a physicist, but interested in both physical and biological explanations, preferably with references, not just speculation.
Best regards and thank you for your contributions in advance!
Dear Alex
Your question is very interesting, I advice you to read the paper; **Behavioral responses of two deep-sea fish species to red, far-red, and white light**, and interesting book in this link. Thank you for your consideration, good luck for your research.
Fatima
https://www.google.it/search?tbm=bks&hl=it&q=fish+response+within+the+range+of+wavelengths
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