Question

Briefly describe the class pisces with examples. [5 Marks]

Answer 1

Class: Pisces:
Fishes are poikilothermic (cold-blooded), aquatic vertebrates with jaws. The streamlined body is divisible into head, trunk and tail. [1 Mark]

• Locomotion is by paired and median fins. Their body is covered with scales. (1 Mark]
• Respiration is through gills. The heart is two chambered with an auricle and a ventricle. [1 Mark]
• There are two main types of fishes.

(i) Cartilaginous fishes, with skeleton made of cartilage. Example:Sharks, Skates. [1 Mark]
(ii) Bony fishes with skeleton made of bones. Example: Carps, Mullets. [1 Mark]