At present, all tuna farming is based on wild capture and feed lotting. The impounded tuna are fed on a diet of small pelagic fish such as sardines, mackerel and herring. The manufactured feeds developed thus far have focused on moist and semi-moist feeds, which produce a soft-textured product, however dry feeds have also been trialed. Farmed tuna are generally fed for 3-6 months before harvest. Feed intake can start at more than10 per cent of body weight per day (bw per d) for raw fish feeds, stabilising to less than 5 per cent bw per d nearer to harvest. FCR (dry feed weight) values range from 3-6:1. Cumulative SGR's of 0.5-0.6 have been achieved.