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Fish Are Evolving to Be Smaller, Threatening Global Food Supply

Evolutionary changes in nearly 3,000 fish species will reduce global fishery yields by up to 30% under high-emission scenarios, impacting protein availability worldwide.

  • The Science paper found that evolution will reduce global fish yields by one-fifth under current warming and up to 30 percent in high-emissions scenarios, according to the study published today.
  • Warming waters drive fish to grow faster, mature earlier, and decrease maximum size, reducing sustainable harvests despite helping fish persist.
  • In total, the life histories of nearly 3,000 fish species were tested to corroborate the model's accuracy, which projected future yields across 43 major fisheries worldwide.
  • The study predicts reduced protein availability and bigger industry losses, meaning over 1.1 billion meals lost annually and 50 percent higher fishing industry losses, David Reznick said.
  • This evolution is good for fish but bad for fisheries, Professor Craig White said, urging strong climate policy to limit warming to 1.5 degrees Celsius and preserve roughly 18 million metric tons.
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studyfinds.com broke the news in on Wednesday, November 5, 2025.
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