The Fish

Osteichthyes-Bony fish
(eg.Tilapia sp.)
Most bony fish belong to the group of ray-finned fish called Teleostei. Most food, sport and aquarium fish belong to this group. About 30000 species and sub-species are known.
Habitat
Bony fish occur in seawater, fresh and estuaries.
External characteristics
The body is divided into head,trunk,and tail.On the head are a mouth, two large eyes, two external nostrils for smelling and an operculum(a bony plate which covers the gill-slits)one each side of the body.
The trunk is bilaterally flattened and covered with dermal scales. …