https://www.siliconvalley.com/2021/04/05/pacific-waters-off-the-west-coast-showed-improved-productivity-says-noaa/

Ocean waters off the West Coast showed signs of improved productivity in 2020 after several years of warm water and poor fisheries conditions, according to the most recent California Current Ecosystem status report released by the National Oceanic and Atmospheric Administration.

The transition last year from an El Nino to La Nina climate pattern, paired with a strong upwelling of cold water from the deep ocean, created ideal conditions for nutrient-rich plankton to proliferate, according to the report. These tiny organisms provided food for larger marine animals, and their abundance helped grow populations of fish, birds, and mammals such as sea lions higher up the food chain.