Study notes - Chondrichthyes & Osteichthyes - Anatomy of fishes and a list of the functions PDF

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Chondrichthyes & Osteichthyes - Anatomy of fishes and a list of the functions of the vertebrate jaws....

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Week 2 Chondrichthyes & Osteichthyes A list of the functions of the vertebrate jaws     

Eating Grabbing the whole prey Taking bites of a large prey Crushing Chewing

The fish presented above has forked caudal find which means this is a frequent swimmer and most active fish. This fish has homocercal caudal fin like most of the Osteichthyes class. In homocercal tail the top upper fork is the same size as the bottom lower fork. Due to its pointed pectoral fins this fish can swim fast.

These are surface-oriented fishes because they are quite small, they have flattened heads as well as mouths that point up, their eyes are quite big, and finally these species have dorsal fins which are placed posteriorly. Due to these adaptations these species can feed on small insects, plankton and some smaller fish which are located at the surface of the water.

Bottom dweller like mullet have elongated body and they are a bit flattened along its sides. It can also be seen that they have got small mouth and two barbels which they used for tasting and touching. Due to this adaptation these fish can feed on small sea creatures such as shrimps or small fish which are located at the surface of the water. Other bottom dwellers like clingfish with flattened heads are characterized by a suction disk which is placed on the undersurface. It is formed by the pelvic fins as well as fold of flesh. Due to the adaptation of containing the sucking disk this fish lives on the bottom as it can hold on the surface....