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On September 17th, 1998 the Ithaca Journal ran its first "Ask A Scientist!"
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Previous Week's Question Published: 5 December, 2001 Next Week's Question

Do fish see in color?
Question
Do fish see in color?
Ask your own question!

Question
There is not just a single answer to this question since not all fish have
been tested for color vision. However, the common goldfish certainly sees
in color and many more at least have the necessary nervous system elements
for color vision to be present. Color vision is the capability to see and
recognize objects based not on how bright they are, but on how well they
absorb, reflect or


Source: www.ccmr.cornell.edu/education/ask/?quid=295


can fish see color


Vision in fishes - Wikipedia, the free encyclopedia

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** Vision in fishes **

From Wikipedia, the free encyclopedia
Jump to: navigation, search
An oscar, /Astronotus ocellatus/, surveys its world

Vision is an important sensory system for most species of fish. Fish eyes
are similar to terrestrial vertebrates like birds and mammals, but have a
more spherical lens. Their retinas generally have both rod cells and cone
cells (for scotopic and photopic vision), and most species have colour
vision. Some fish can see ultraviolet and some can see polarized light.
Amongst jawless fish, the lamprey has well-developed eyes, while the
hagfish has only primitive eyespots.^[1] The ancestors of modern hagfish,
thought to be the protovertebrate^[2] were evidently pushed to very deep,
dark waters, where they were less vulnerable to sighted predators, and
where it is advantageous to have a convex eye-spot, which gathers more
light than a flat or concave one. Unlike humans, fish normally adjust focus
by moving the lens closer to or further from the retina.^[3]

Fish vision shows adaptation to their visual environment, for example deep
sea fishes have eyes suited to the dark environment.

*Contents*

· 1 Water as a visual environment
· 2 Structure and function
· 3 The retina
· 4 Accommodation
· 5 Ultraviolet
· 6 Polarized light
· 7 Double cones
· 8 Adaptation to habitat
· 9 Colouration
· 10 Barreleyes
· 11 Sharks
· 12 Other examples
· 13 Distance sensory systems
· 14 See also
· 15 Notes
· 16 References
· 17 Further reading
· 18 External links

*Water as a visual environment[edit]*

Fish and other aquatic animals live in a different light environment than
terrestrial species. Water absorbs light so that with increasing depth the
amount of light available decreases quickly. The optic properties of


Source: en.wikipedia.org/wiki/Vision_in_fishes

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