fish are kept in cages in the sea to stop them using as much energy swimming about
the cage also protects them from interspecific predation
they are fed a diet of food pellets that is carefully controlled to max the amount of energy they get - the better the quality of food - the quicker and bigger the fish will grow
young fish reared in special tanks to ensure as many survive as possible
crucial to keep young fish separated from bigger fish and provide regular food - make sure big fish don't eat little ones - intraspecific predation - organisms eat individuals of the same species
fish kept in cages - more prone to disease and parasites - one pest is sea lice - which can be treated with pesticides that kill them - to avoid pollution from chemical pesticides - biological pest control can be used instead
fish can be selectively bred - produce less aggressive and faster growing fish
