The National Fisheries and Aquaculture Service (Sernapesca) in the Los Lagos region, Chile, has reported the activation of contingency plans in nine salmon farming centers in the Reloncaví Estuary's Group of Salmonid Concessions (ACS) 1, with six centers also implementing plans for mass mortality. Two farm sites, operated by Chilean salmon farmers Trusal and Caleta Bay, experienced a mass mortality incident linked to a suspected algal bloom on Nov-23. The estimated loss is 486.4 metric tons of coho salmon and trout, approximately 1.62% of the total biomass in ACS 1, which houses 30 thousand metric tons (mt) of fish.