Salmon farms are this species’ main extinction threat. But have the farms changed – or just kept going?

Two alarms were sounded last year over the extinction threat that salmon farms posed to a endangered species of ray that only lives in a harbour on Tasmania’s west coast.

But there are fears that not enough has changed since, and the farms are effectively continuing as they were.

The first alarm was in May, when an Institute for Marine and Antarctic Studies (IMAS) report found that Maugean skate numbers had declined by 47 per cent between 2014 and 2021.

This was put down to reduced dissolved oxygen levels, with salmon farms considered a main source of the problem.

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