Recycling of slaughter by-products into aquaculture feed is standard practice in Australia. Use of animal byproducts is a public health issue given a number of food crises in the recent past including BSE in Europe. For safety reasons most abboitar byproduct materials have been subject to severe restrictions for use in feeding farm animals in the European Union, and the U.K.
Meat and bone meal (MBM) of ruminant animal origin, which was at the base of the BSE crisis has not been allowed back into feed ingredients.
The European Commission established stringent guidelines banning the use of ruminant processed animal proteins into aquaculture feed starting from 1 June 2013, while not allowing by products from chickens and other animals.
Tasmanian salmon farmers can feed their fish pellets containing animal and ruminant abattoir by products. An average of 8% of the ingredient listing of salmon aquaculture feed has been found to contain mammal byproducts including cattle and sheep.
Huon Aquaculture provides some basic information on the composition of the feed it uses. Though it does not detail where their fish meal and fish oil products are sourced from, how much of the animal product is mammal or chicken, or what sorts of crops and vegetable materials are being used in its various feed types. It is doubtful that feeds made for juvenille fish, sick or heat stressed fish, or pre-harvest salmon that are traditionally given more fish meal are getting exactly the same feed ingredient profiles.