Ocean ranching: Release of farm-raised juveniles into the wild to supplement wild fisheries. The release of the captive-reared individuals is common in areas where stocks of fish are depleted due to overfishing, habitat destruction or pollution. The term ranching is also used to refer to the aquaculture practice of capturing juvenile fish from the wild and rearing them in cages. The fish are kept in cages and are fattened up until harvested at their optimal size and weight. This practice is common in Australia and the Mediterranean with bluefin tuna.