Huon Aqua

Booker Prize-winning author Richard Flanagan's 2021 book "Toxic: The Rotting Underbelly of the Tasmanian Salmon Industry" produces a range of allegations against the Tasmanian salmon sector - relating to feed ingredients, pollution and political skullduggery. These include the use of poultry by-products in feed, as well as the addition of ethoxyquin, which he says is potentially carcinogenic, to stabilise the feed.
Source: The Fish Site (2021)

Huon Aqua operate salmon farms in Tasmania. GoodFish, Australia's Sustainable Seafood Guide recommends you 'say no' to farmed Atlantic salmon (Red rating). It's website states: produced in sea cages; carnivorous species that is dependent on wild caught fish that is manufactured into fish feed. While the amount of wild caught fish in feed has been reduced over recent years, the amount of wild-caught fish used in feed is currently more than the weight of salmon produced; localised impacts from salmon farming effluent are minor and short-lived; impacts of the industry on a broader ecological scale are less well understood; producers have reduced the use of antibiotics.
Source: GoodFish (2020)