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Characterization of fishes

According to illustrations of representing beings, how are fishes characterized, fundamental morphology, skin, circulation, respiration, nitrogen waste, thermal control and kinds of reproduction?

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Illustrations of representing beings: sharks, sardines, rays, tuna, salmons. Fundamental morphology: hydrodynamic body and fins; cartilaginous skeleton in the chondrichthyes and bony skeleton in osteichthyes. Skin: with scales in osteichthyes or placoid scales in chondrichthyes. Respiration: branchial. Circulation: closed, in-complete, heart with two chambers. Nitrogen waste: urea in chondrichthyes and ammonia in osteichthyes. Thermal control: heterothermic. Kinds of reproduction: sexual, internal fecundation in chondrichthyes and external in osteichthyes.

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