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How does a fish operate? Buoyancy

Unique part of the fish, the air bladder (buoyancy). Similar in function to the ballast tanks in a submarine, varying the inflated volume of the sack the fish can adjust its degree of buoyancy.

Very few fish can handle sudden changes in pressure when hauled up too quickly from deep water (cease to struggle in the fight, gas bladder distended and protrudes through the mouth).

For fish that come up from deep water with their air bladder in their throat, take along a hypodermic type needle to insert in the bladder to relief the pressure in the bladder before releasing.

Fish without air bladder live a life of constant motion to prevent them from sinking or adapt to bottom living.

How does a fish operate? Respiratory