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Generally speaking fish have both rods and cones within their eyes, so many are know to have the ability to see colors such as those colors we can see, however they also can see the ultraviolet spectrum; as such, they see colors that we humans do not. Their visual perception may vary depending on conditions, such as depth of water, bottom structure, reflective factors... and their perception of what is seen may be vary different than what we see, given the same conditions.
Greg brings up some good points, and I'll add that light wave lengths travel much slower underwater than they do in air which is likely related to amongst other things, those things Greg brings up.
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