SWIM BLADDER?
The swim bladder is a gas-filled internal organ located in the abdominal cavity of many bony fish. Its main role is to regulate buoyancy by adjusting the amount of gas it contains. This allows the fish to remain at a stable depth without swimming constantly, saving energy.
By changing the amount of gas (mainly oxygen) in its swim bladder, the fish adjusts its buoyancy. If the bladder fills with gas, the fish becomes more buoyant and rises; if it empties, the fish becomes denser and sinks.
Brown meagre
In some species, it can act as a sound resonator for communication (as in brown meagre). In others, it can play a role in hearing and balance.
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