Write the general characters of the class Osteichthyes.

Question

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Answer

They are marine or freshwater fishes.
They have a bony endoskeleton.
The body is spindle-shaped.
The skin is covered by ganoid, cycloid or ctenoid scales.
Respiration is by four pairs of gills covered by an operculum.
The air bladder is present which helps in gaseous exchange (lungfishes) for maintaining buoyancy.
They have two-chambered hearts.
They have mesonephric kidneys and ammonotelic.
The lateral line sense organ is present.
External fertilization is seen and most forms are oviparous e.g. Labeo and Catla.

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