"'These organism need to move up and down in the water column in response to changes in light intensity and other factors , so they have built-in mechanism to maintaining buoyancy,' says Hugill. Some have tiny air bladders. others possess the ability to retain air as a means to regulate their position in the water.'They're generally able to adjust to variations in barometric pressure, but a fast change can catch them off guard, making them slightly unstable.'"
Don Johnson in March 2007 "NAF" Rick
