A) star fishes
B) bony fishes
C) carp fishes
D) all of these
Correct Answer: B
Solution :
Swim bladder or air bladder lies in the body cavity but outside of coelom in bony fishes such as Rohu (Labeo rohUa) it is an elongated, white, thin walled sac. filled with air. Swim bladder functions like a hydrostatic organ. It regulates specific gravity of body by secretion or absorption of gas in the air bladder.
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