Fish may be vaccinated for some diseases when they are very young. Air is pumped into the water so the fish have enough oxygen to breathe. The water is cleaned and recycled daily. Young fish are fed fishmeal flakes many times a day to help them grow. Older fish eat fishmeal pellets.
Most fish farms have feeders that put food into the water at set times during the day.
Some farms use a demand feeder , which allows fish to eat whenever they want. The fish hit an object in the water and feed drops into the water. Other Could be a few hundred to a few thousand by one female Eats dry flakes of fish meal several times a day. Eats less than 1 gram of fishmeal per day. Fed several times a day.