Size Of Fish Shrinking From Overfishing

FILE - An Atlantic salmon leaps out of the water at a Cooke Aquaculture farm pen on Oct. 11, 2008, near Eastport, Maine. A New Hampshire group wants to be the first to bring offshore fish farming to the waters off New England by raising salmon and trout in open-ocean pens miles from land, but critics fear the plan raises environmental concerns. Blue Water Fisheries wants to place 40 submersible fish pens on two sites totaling nearly a square mile about 7.5 miles off Newburyport, Massachusetts, according to federal documents from June 2022. (AP Photo/Robert F. Bukaty, File)

Fish are shrinking. The average body weight of nearly three-quarters of marine fish populations sampled dropped between 1960 and 2020, a recent study suggests.

The change threatens the food supply of the more than 3 billion people who rely on seafood as a source of protein, The Washington Post reported.

Overfishing is known to reduce fish sizes — fish are larger in protected marine areas — but climate change seems to play a part as well: Researchers found that trout reared in warm water tanks were on average less than half the size of those raised in colder ones.

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