By end of century, North American fish biomass, catch potential and revenue are ~9% higher under RCP2.6 than RCP8.5 and differences are greatest for US fisheries  and to depth decrease access to shellfisheries in CA-QC and subsistence species in CA-BC , with impacts increasing north to south and under RCP8.5 as compared with RCP2.6. Climate change  shifts the relative percentage of catch and profits for the USA-Canada transboundary stocks under RCP8.5 ; decreases in biomass of historically large fisheries in US-NA and CA-QC, and US-AK and important subsistence species in CA-WA and CA-BC, while some increases in the North Atlantic. Declines are greater under RCP8.5 relative to RCP2.6. In EBS , community biomass, catches and mean body size decreases by 36, 61 and 38%, respectively, under RCP8.5 . Climate change causes declines in global marine aquaculture production under RCP8.5 with impacts greater for bivalve than finfish and with significant disparities among regions in direction and magnitude of changes; greatest declines for finfish aquaculture expected in northern regions , and large declines for bivalve production  for Canada. Declines become more probable by 2050-2070.
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report