Parasites on wild pink, chum salmon dropped 96% post salmon farm removal: Morton, Routledge
Sea lice on young pink and chum salmon in the Discovery Islands region dropped 96 per cent after salmon farms were removed in 2020, a new paper co-authored by independent researcher Alexandra Morton concludes.
Between 2020 and 2022, Morton and Routledge counted sea lice on 1,627 pink and chum salmon passing through the Discovery Islands region where salmon farms had been removed. Sea lice are naturally occurring and can get passed back and forth between wild and farmed salmon in open-net cases. “The results of this study demonstrate that the depopulation of the salmon farms in the Discovery Islands area was accompanied by a substantial and highly significant decline in sea lice infection on juvenile pink and chum salmon migrating through the area,” the paper concludes.
While the association acknowledges there was a noticeable decrease in sea lice on wild fish in 2022 in the region in question, it notes that this was the case both before and after the fish would have migrated past open-net salmon farms. “The data shows that the sea lice abundance on juvenile wild salmon in 2022 was about 50 per cent less than in 2020, however, that was the case both before they reached salmon farms and after they passed by salmon farms.
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