Sea fish are increasingly exhausted due to the hot sea

More than half of the important fish groups with marine food networks can die because global warming reduces the amount of dissolved oxygen in seawater in many areas.

That is the judgment of scientists working at Scripps Institution of Oceanography (USA) after analyzing data collected in 1951 about plankton and fry serving the sardines industry.

The team led by Tony Koslow led the study of 86 fish species records and found that the proliferation of 27 species depends heavily on the amount of dissolved oxygen in the water at a depth of 200-400m. For every 20% reduction in oxygen, the number of fish decreased by 63%.

Marine fish will be increasingly exhausted.

According to global climate models, 20-40% of oxygen at a depth of 200-400m will disappear in the next century due to the rising temperature of the Earth. The main reason is because the water mixes with oxygen by mixing with surface water, Koslow said. The lighter, warmer surface waters are less likely to mix with heavier, colder waters below.

Of the 27 species of fish most affected by low oxygen levels, 24 daytime species live in deep, dark waters of less than 200 meters to avoid predators, for example, eye-catching prey species. There are about 10 billion tons of such fish worldwide; they are important food for other fish, seabirds and mammals.