Physiological Evolution of Fish
The anatomy of a typical fish adapted from Moyle, P.B., & Cech, J.J. (1982).
How fish has evolved physiologically to become suited to its environment
Fishes have been around for utmost 500 million years during which time they have managed to adapt to any type of aquatic habitat. Physiologic features the fish posses that make them more adapted to the environment they live in are not universal to all the species of fish. Some fishes may have elongate bodies where as others may have greatly shortened bodies. In others, the bodies may be flattened while others may have laterally compressed bodies. Other fish species may have elaborately extended fins that form intricate shapes while others may have reduced or even lost fins. The positions of the eye, the mouth, the nostril, and even the gills also differ in different fish species. Some fishes are cryptically colored. Their colors match their environments. Some fish have light producing organs. Some are capable of living in shallow thermal springs and others beneath the ocean surface. This paper seeks to explain how fish has evolved physiologically to become suited to its environment (aquatic or marine).
Almost all fish species have streamlined bodies that enable...
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