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*Archives of Ask A Scientist!*

-About "Ask A Scientist!" -

On September 17th, 1998 the Ithaca Journal ran its first "Ask A Scientist!"
article in which Professor Neil Ashcroft , who was then the director of
CCMR, answered the question "What is Jupiter made of?" Since then, we have
received over 1,000 questions from students and adults from all over the
world. Select questions are answered weekly and published in the Ithaca
Journal and on our web site. "Ask A Scientist!" reaches more than 21,000
Central New York residents through the Ithaca Journal and countless others
around the world throught the "Ask a Scientist!" web site.

Across disciplines and across the state, from Nobel Prize winning scientist
David Lee to notable science education advocate Bill Nye, researchers and
scientists have been called on to respond to these questions. For more than
seven years, kids - and a few adults - have been submitting their queries
to find out the answer to life's everyday questions.

Previous Week's Question Published: 5 December, 2001 Next Week's Question

Do fish see in color?
Do fish see in color?
Ask your own 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


can fish see color

Vision in fishes - Wikipedia, the free encyclopedia


** Vision in fishes **

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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.


· 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


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