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Characterization of the fishes

Characterizes the fishes in accordance to the examples of representing beings, skin, basic morphology, respiration, circulation, thermal control, nitrogen waste and types of reproduction?

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a) Examples of representing beings: rays, sharks, sardines, tuna, salmons.

b) Basic morphology: hydrodynamic body, fins;

c) Cartilaginous skeleton in the chondrichthyes, bony skeleton in osteichthyes.

d) Skin: with scales in the osteichthyes and placoid scales in chondrichthyes.

e) Respiration: branchial.

f) Circulation: incomplete, closed, heart with two chambers.

g) Nitrogen waste: urea in chondrichthyes, ammonia in osteichthyes.

h) Thermal control: heterothermic.

i) Types of reproduction: sexual, internal fecundation in chondrichthyes, external in osteichthyes.

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