The vertebrate eye contains about 125 million "rod" cells which distinguish between light and dark and close to 6 million "cone" cells which distinguish colours.
Each cone cell contains a visual pigment which absorbs light of a particular wavelength, generally between 400 and 700 nanometres (nm); the range of visible light. Wavelengths between 300 and 400 nm make ultraviolet (UV) light.
Yes.....it was from an artical on the web.....there are many you can do a search for "fish sight" or similar. Here's another one for you .....interesting stuff
Many fish have color vision but some colors do not penetrate deeper water - blue is better seen at depth than red or yellow. Fish color vision is probably very different from ours. Contrast betweeen the color of the foreground and the background is important for their sight.
Wasajigifying -[ was - a - jig-i-fy-ing] - the concept of not knowing what the hell your saying.