I recommend having a read about Macquarie harbour and what happened ..
https://www.abc.net.au/news/2017-06-08/how-salmon-farming-got-to-push-macquarie-harbour-to-the-limit/8349342?nw=0
Nothing to see here, move along..
https://www.abc.net.au/news/2020-11-03/scathing-comments-about-fish-farm-review-panel-revealed/12840010
Déjà vu
https://www.abc.net.au/news/2021-02-05/huon-objects-to-petuna-salmon-farm-licence-over-biosecurity/13124248
Now we have
https://www.abc.net.au/news/2021-02-13/salmon-producer-tassal-fish-deaths-long-bay-port-arthur/13145572
Make up your own minds, there are more articles I have not listed, just follow the trail of dead fish etc, it all makes for interesting reading..