the gas that released by fish is a carbon that the fish can live at the water without a air. and the fish can not live if without small amount of air. and process by breathing with amount of air that all the animals and humans can breath.
the gas is may be another chemical that the fish can breath at the surface an can help to make the fish can breath at small air and big water.
yes they swallow water and expel the used water out their gills.
Fish respire in water through gas exchange in their gills.
When water splits, hydrogen gas and oxygen gas are formed.
Fish,oil,gas,propane,water
That would be oxygen
Water must flow with some regularity across the gills of fish for gas exchange to take place. This is essential if the fish is to stay alive. Oxygen is taken from the water by the gills, and carbon dioxide is put into the water. The gills of fish serve essentially the same function as the lungs of people.
Fish have an gas-filled, internal swim bladder, whose buoyancy they regulate to keep from sinking or rising in the water.
C. Hydrogen
Fish are able to stay afloat due to their swim bladders, which are gas-filled organs that help regulate their buoyancy. By adjusting the amount of gas in their swim bladders, fish can control their position in the water column. The overall shape and composition of a fish's body also contribute to their ability to stay afloat and move through the water efficiently.
A fish actually excretes ammonia dissolved in water. At the temperature and pressure that fish are normally found ammonia is a gas.
Water is released in the atmosphere as a gas.