In bony fishes, the swim bladder is used for

(A) adjusting the weight of the fish when swimming at different levels.
(B) extracting oxygen from water which enters the mouth of the fish.
(C) equalizing fluid pressures between the fish and the surrounding water.
(D) absorbing more water when the fish is about to descend to a lower level

Ans:

(A) adjusting the weight of the fish when swimming at different levels.