WUWT
"‘Fish thermometer’ reveals long-standing, global impact of climate change....... Me, I think it is just that the fish go where the food is, and cold water upwelling tends to make more food available. From NOAA:
The ecological effects of upwelling are quite diverse, but two impacts are especially noteworthy. First, upwelling brings up cold, nutrient-rich waters to the surface, which encourage seaweed growth and support blooms of phytoplankton. The phytoplankton blooms form the ultimate energy base for large animal populations higher in the food chain, including fish, marine mammals and seabirds."
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