If you don't like eating fish, you might be a fan of global warming. Warming oceans are changing fish stocks around the world.

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Haddock in the North Sea are among the climate change "losers" as a result of warming ocean temperatures.
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▼ Most know that climate change is  changing the world today and will  change it more tomorrow. But what’s not always as well-examined is how much it’s altered already. A new studyout of Rutgers University gazes back at shifts that have taken place since the 1930s in global fish stocks, finding losses of 4.1 percent—1.4 billion metric tonnes of fish—since that time.
“Much of the work on climate change and fisheries is forecast into the future,” says study author Chris Free, now at the University of California, Santa Barbara.
Free did the research with Rutgers when he was a postdoc. He and his colleagues wanted to figure out what changes had already taken place, both to gain a better understanding of historical climate change and to better forecast what trends may emerge when we look back at today. Fish stocks are a vital measure of the health of the oceans as a whole, but they’re also an important indicator of long-term food and economic security.
Although the health of global oceans affects everybody, the impacts from declining stocks are especially felt in tropical countries, which rely more on fish as a food source and fishing as part of the economy, says Rashid Sumaila, director of the University of British Columbia’s Fisheries Economic Research Unit.
The researchers relied on maps of historical ocean temperature and the most comprehensive database  available of historical catches.  (▪ ▪ ▪)

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