SSC MTS EXAM

Detailed explanation-1: -The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ that contributes to the ability of many bony fish (but not cartilaginous fish) to control their buoyancy, and thus to stay at their current water depth without having to expend energy in swimming.

Detailed explanation-2: -The swim bladder is made up of two sacs in some and one in other species of fish. It is surrounded by a tough outer membrane and located in the dorsal cavity lying just under the spinal cord in the coelomic cavity portion of the fish.

Detailed explanation-3: -Final answer: Swim bladder in fish is an organ for buoyancy.