How and why would downwelling affect fisheries in coastal areas on the eastern sides of ocean basins?

Downwelling in coastal areas on the eastern sides of ocean basins can lead to reduced nutrient supply from deeper waters to the surface, affecting primary production and thus the food chain for fisheries. This can result in lower fish populations and decreased productivity in those areas. Additionally, downwelling can cause changes in water temperature and oxygen levels, further impacting fish habitat and migration patterns.