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Fishes showing greatly geographic distribution can live almost wherever water exists. It is possible to come across to fishes in the Antarctic water (-2 °C), tropical water (37–38 °C, moreover 44 °C), freshwater, marine whose salinity changing up to the amount of %0142. They are found at elevations up to 4.000 meters (water lightening by sun and flowing rapidly) and below the surface of marine 11.000 meters (water is extremely peaceful and predominating pure dark). Fishes living in so much different habitats show anatomical differences distinctly than other Vertebrates. To do scientific investigations concerned with fishes, researcher has to learn Fish Anatomy primarily. In all studies relating to fishes, evaluation of data obtained depends on how much we learn Fish Anatomy, also.

Body shapes and parts, cavities, fins, skin structure, scales, color; dermal skeleton, aksiyel skeleton, appendicular skeleton; muscle kinds, active and passive locomotion; digestive system organs and nourishment; gills, formations connected with respiratory; heart, artery, vena and lymphatic system; central and peripheral nervous system; organs of sight, odor, taste, balance, hear; endocrine glands; kidney structure and excretion; osmoregulation and retia mirabilis; gonads, sexual mature, growth and reproduction.