When a fish loses control of basic functions, it's usually near the end. Several dfferent kinds of pathogens can bring a fish to these terminal symptoms. When the central nervous system starts to break down, the fish may spin or stagger.
The swim bladder is a gas-filled organ that helps keep a fish weightless in water. Some freshwater fishes have a swim bladder with a connection to the gut. Other freshwater fishes don't. Control of the gas in the swim bladder is one of those basic functions. When a fish can't stop tilting or floating, it's near the end.
The swim bladder is a gas-filled organ that helps keep a fish weightless in water. Some freshwater fishes have a swim bladder with a connection to the gut. Other freshwater fishes don't. Control of the gas in the swim bladder is one of those basic functions. When a fish can't stop tilting or floating, it's near the end.