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Climate Change May Shrink the World’s Fish

A new study suggests warming sea temperatures could result in smaller fish sizes.

August 22, 2017 — Warming temperatures and loss of oxygen in the sea will shrink hundreds of fish species—from tunas and groupers to salmon, thresher sharks, haddock and cod—even more than previously thought, a new study concludes.

Because warmer seas speed up their metabolisms, fish, squid and other water-breathing creatures will need to draw more oxygen from the ocean. At the same time, warming seas are already reducing the availability of oxygen in many parts of the sea.

A pair of University of British Columbia scientists argue that since the bodies of fish grow faster than their gills, these animals eventually will reach a point where they can’t get enough oxygen to sustain normal growth.

“What we found was that the body size of fish decreases by 20 to 30 percent for every 1 degree Celsius increase in water temperature,” says author William Cheung, director of science for the university’s Nippon Foundation—Nereus Program.

These changes, the scientists say, will have a profound impact on many marine food webs, upending predator-prey relationships in ways that are hard to predict.

“Lab experiments have shown that it’s always the large species that will become stressed first,” says lead author Daniel Pauly, a professor at the university’s Institute for the Ocean and Fisheries, and principal investigator for the Sea Around Us. “Small species have an advantage, respiration-wise.”

Still, while many scientists applaud the discovery, not all agree that Pauly’s and Cheung’s work supports their dramatic findings. The study was published today in the journal Global Change Biology.

Read the full story at National Geographic

Indigenous peoples of the world’s coastlines are losing their fisheries — and their way of life

December 5th, 2016 — The world loves seafood. According to some estimates, people consumed about 102 million tons of it last year.

A new study released Friday by the Nippon Foundation-Nereus Program, based at the University of British Columbia, shows that indigenous people who live on the world’s coasts are definitely hooked. They consume 15 times more seafood per capita than people in other parts of the world, about 2.3 million tons, or about 2 percent of the global catch, the study said.

They don’t simply catch and eat fish and other seafood. It’s the heart of communities, the center of culture and religion, a gift from the heavens. Seafood is crucial to the cultures of coastal indigenous people in the Americas, Asia, Africa and the Arctic, among other places, and overfishing and the ocean-wide movement of fish due to climate change could wipe those resources out.

On the coast of Africa at the equator, huge commercial ships are starting to encroach on native fishing areas as ocean stocks diminish. In places such as Madagascar, the stocks of community fisheries have been nearly lost.

“These big industrial fisheries are chasing the fish. In West Africa, larger vessels are moving closer and closer to shore,” said Andrés Cisneros-Montemayor, research associate at the University of British Columbia and an author of the study published in PLOS One. “A lot of these indigenous communities, all they have are dugout canoes.”

Read the full story at The Washington Post 

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