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About AnimalsHow The Puget Sound Region Are Reckoning With Disappearing SalmonThe median fins, dorsal and ventral, reduce the sideways thrust of the swimming routine and also reduce the tendency to roll backward and forward. The paired fins help to steer the fish upwards or downwards during the water and contribute to turning and braking. The paired fins of elasmobranches are held in rather rigid positions while those of teleosts, with their bendy jointing to the body, are more versatile in their routine and might often be seen moving gently to maintain the fish in a gentle place. In the teleosts, there’s a swim bladder. An elongated, air filled sac just below the vertebral column. This air bladder keeps the fish buoyant and stops it from sinking when it stops swimming.