Q. 155.0( 2 Votes )

What are pisces? Classify and explain two different kinds of fishes by the help of suitable examples.

Answer :

Pisces: These are fish. They are exclusively waterliving animals. Their skin is covered with scales. Pisces are cold-blooded animals and have two-chamered heart. They obtain oxygen dissolved in water by using gills. The body is streamlined, and a muscular tail is used for movement.

Superclass Pisces is classified into two classes:


(i) Chondrichthyes – The cartilaginous fishes


(ii) Osteichthyes – The bony fishes


(i) Chondrichthyes – The cartilaginous fishes


(Gr; chondros = cartilage + ichthys = fish)


● They are marine animals with streamlined body and have cartilaginous endoskeleton.


● The skin is covered with minute placoid scales.


● Mouth is located ventrally.


● Notochord is persistent throughout life.


● Gill slits are separate and without operculum (gill cover).


● Air bladder is absent.


● Sexes are separate.


● Examples- Scoliodon (Dog fish), Pristis (Saw fish), Torpedo (electric ray), Trygon (Sting ray).


(ii) Osteichthyes – The bony fishes


(Gr; osteon=bone + ichthyes=fish)


● It includes both marine and fresh water fishes with bony endoskeleton.


● Skin is covered with cycloid/ctenoid scales.


● Mouth is located mostly terminal.


● They have four pairs of gills which are covered by an operculum on each side


● Air bladder is present which regulates buoyancy.


● Sexes are separate.


● Examples-Exocoetus (Flying fish), Hippocampus (Sea horse); Labeo (Rohu), Catla (Katla), Clarias (Magur).


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