Most fish have little salt in them. Sharks, however, have meat as salty as the ocean they live in.
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Most fish can see in color and use colors to camouflage themselves or defend themselves and their territory. Most fish have the best possible eyesight for their habitat and can most certainly see you peering at them in a fish tank. Some fish can see polarized and ultraviolet light.
A fish does not add new scales as it grows, but the scales it has increase in size. In this way, growth rings are formed and the rings reveal the age of a fish.
Fish that have thin fins with a split tail indicate that they move very quickly or may need them to cover great distances. On the other had, fish that live among rocks and reefs near the ocean floor have broad lateral fin and large tails.
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