Southern bluefin tuna farmed by


By-Catch

The Southern bluefin tuna fishery of Australia uses purse seine nets, not hooks, to catch the tuna. Once caught the tuna are then coralled by divers into towing cages. As there are no hooks used, sea birds such as albatross are not caught, and non-target species are also not caught. Longlining, the method used by most tuna fisheries in the world, catches many sea birds and many other species along with the tuna. Furthermore, zero marine mammals such as dolphins are caught by the industry - a claim most "dolphin safe" tuna fisheries can not make.


Environmental Monitoring

In order to monitor the affects of tuna ranching on the environment, organic and inorganic loadings are assessed from both the water column and sediments in and around the cages. Further, the potential environmental affects are assessed not only on a local scale but on and a regional scale as well. Assessments are made based on the strictest environmental standards in the world and new techniques for monitoring environmental health are developed in conjunction with more conventional methods.


The industry is the most closely monitored fishery and aquaculture industry in the world with regular investigations and sampling occuring from the point of capture in the Great Australian Bight to the point of harvest in the Spenser Gulf. Investigations are carried out by industry, government and university scientists and extend from measuring and monitoring impacts not only on the marine environment but also to the interactions between the ranch sites and marine mammals and sharks, as well as the affects on the local sea bird populations. The industry has been given a green zone rating and not only adheres to the strictest regulations in the world but also sets them - such as the maximum stocking density level of 4kg/m3. A level most tuna ranchers half by practice.