Class 11 Biology Animal Kingdom Class Osteichthyes

Class Osteichthyes

  • Members of class Osteichthyes have four pairs of gills which are covered by an operculum on each side.
  • Air bladder is present which regulates buoyancy.
  • Heart is twochambered and they are cold blooded animals.
  • Sexes are separate, fertilization is usually external,they are mostly oviparous and development is direct.
  • The body is streamlined.

Examples- Marine – Exocoetus (Flying fish),

Freshwater – Clarias (Magur)

Aquarium  – Betta (Fighting fish).


Fig. flying fish


Fig. Magur



Fig. Fighting fish

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