Compound hydrological and thermal extremes: A nonstationary risk modeling approach for riverine ecosystems

Salmon lice from aquaculture reduce marine survival of Atlantic salmon.
Studies show that salmon farms increase lice infestations, which reduce the survival of wild Atlantic salmon.
This review of trials in Ireland (2001–2019) found that untreated salmon were 18% less likely to return as adults, and higher farm lice levels meant lower survival for all salmon.
This confirms that lice from aquaculture pose a real threat to wild salmon, highlighting the need for stronger lice control to meet conservation goals.