Warming seas and fish
As water warms, many fish shift towards the poles or deeper water, and some stocks shrink.
Also: climate change and fish, marine heatwave
Fish are cold-blooded, so each species lives within a band of temperature. As seas warm, many move towards the poles or into deeper, cooler water. Mackerel in the North Atlantic have spread north to Iceland and Greenland, and some studies report Indian oil sardine and mackerel moving into new areas along India's coasts. Warm water holds less oxygen, and marine heatwaves can kill fish and corals. Changes to monsoon rains alter river floods that carps and hilsa depend on for spawning.