has strongly decreased in the North Sea , and fisheries yields have also decreased in the Celtic Sea, attributed primarily to warming and secondarily to long-term exploitation . Conversely, fish species diversity and overall productivity have increased in the Gulf of Maine, even with warming . Fisheries yields have decreased in the Yellow Sea, East China Sea and South China Sea partially due to overexploitation , with warming exerting more influence on the yield of cold-water species than on temperate- and warm-water groups . The combined effects of exploitation and multi-decadal climate fluctuations make it difficult to assess global climate-change impacts on fisheries yields .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report