The Mechanism Whereby Buoyancy Is Achieved in Different Kinds of Fishes

Multiple Choice

The mechanism whereby buoyancy is achieved in different kinds of fishes is

A) through the presence of a large,oily liver when a swim bladder is not present.
B) through the presence of a swim bladder that is kept filled as the fish periodically swims to the surface and gulps air.
C) through the presence of a swim bladder that is regulated internally by structures that add or remove gas from the bladder by capillary beds.
D) All of the choices are methods for achieving buoyancy.
E) None of the choices is correct.