How does the swim bladder function as a respiratory organ?

Question

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Answer 1

Swim bladder is connected to the digestive tract and lies dorsal to the gut.It serves as the organ to confer buoyancy.In some fishes they are connected with the internal ear and related to sound production. In lung fishes however it assumes the function of respiration becoming alveolar. It has the supply of venous blood form the last pair of aortic arch. This is different from the typical hydrostatic organ where the swim bladder receives only arterial blood and gives off venous blood.

Answer 2

Shallow water fish fill their bladder by gulping air from the surface. Fish from deeper water have glands that release lactic acid that forces hemoglobin to release oxygen into the bladder. Fish can indeed use the oxygen in the swim bladder by absorbing it back through the capillaries, where hemoglobin will be available to bind it. Using the oxygen in the swim bladder will not last long though, only a couple minutes.

Answer 3

The swim bladder is not a respiratory organ, it is just used to control the buoyancy of the fish. The gills are what allows fish to breath underwater.