Alaska's snow crab collapse was likely caused by climate change, and cannibalism
.” The population boom continued into 2018 and 2019, creating what Jones says was the largest recruitment event on record. Jones is something of a local piscine historian. He can quote fishery statistics going back 30 years in the same way a Red Sox fan might quote batting averages.
between 2017-2019. Unlike mammals, who use less energy when temperatures rise, cold-water fish and crustaceans speed up their metabolism. The faster the crabs grow and expend energy, the faster they have to replace it, says Jones. Some of the crabs may have headed north into cooler Russian waters, but most seem to have stayed put. “All of a sudden you had this huge number of little crabs coming up, eating themselves out of house and home,” says Jones.
Snow crabs are only the latest victim of climate change up in the Bering Sea area. For years, the fishing industry has reported lower-than-usual catches of certain species. But rising temperatures don’t necessarily lead to a steady decline into obsolescence. Just as likely it leads to unpredictable boom and bust cycles for climate change winners and losers that have unanticipated consequences for creatures up and down the food chain.
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