EVERYDAY SCIENCE

Detailed explanation-1: -When the swim bladder expands it will increase in volume and therefore displace more water. This increases the fish’s buoyancy and it will float upward. When the swim bladder deflates the fish’s buoyancy decreases and it will sink as it displaces less water.

Detailed explanation-2: -Swim bladder or air bladder provides buoyancy to the fish. It is present only in bony fish. It is a gas-filled organ that helps the bony fish to control its buoyancy in water without sinking.

Detailed explanation-3: -Osteichthyes (bony fish) use swim bladders that are filled with oxygen taken in by their gills. The more air in the swim bladder the more buoyant the fish and the less air in the swim bladder the less buoyant the fish. The swim bladder is similar to human lungs in the way that it expands and deflates.

Detailed explanation-4: -Air Bladder is a sac-like outgrowth from the dorsal wall of the esophagus of bony fishes. Ballast organ: It helps fish to maintain their depth by balancing buoyancy forces without sinking below or floating above. Enables it to maintain the proper level and balance in the water.

Detailed explanation-5: -The pressure affects the gases in the fishes’ bodies, decreasing the volume occupied by the gases with each increase in depth. Conversely, as a fish rises in the water column, the decreasing pressure causes the volume of the gases in the body, primarily the swim bladder, to increase.