Give the characteristics of the following with examples :
Class Pisces

Explanation

(i) They are cold blooded (Poikilotherms) aquatic animals living in marine and fresh waters.
(ii) Body is spindle shaped to minimze water resistance.
(iii) They have paired and unpaired fins for swimming. Tail fin is useful as a steering organ while swimming.
(iv) Exoskeleton is in the form of scales and endoskeleton is either cartilagenous or bony.
(v) Respiration is carried out with the help of gills. e.g. Rohu, Scoliodon, Pomfret, Sea horse, Electric ray, Sting ray, etc.