NOAA says the vanishing of the snow crab appears to be one of the largest reported losses from a marine heat wave in the world.
The vanishing of the snow crab appears to be one of the largest reported losses from a marine heat wave in the world, according to NOAA.
Snow crabs prefer cold water, between 0 and 1 degree Celsius, but 2018 and 2019 brought record-warm temperatures, above 3 degrees Celsius, to the Bering Sea.Their metabolisms increased in warmer waters, which meant they needed to eat more food. However, their habitat got smaller, so they had less room to find that food and had to compete against each other to eat.
Some believed the mass fatality event could have been caused by overfishing. However, most of the crabs that went missing were young and therefore too small for commercial fishing. Data from the study shows water temperatures are almost back to normal for the Bering Sea, but that does not mean it will stay that way.
Researchers are seeing an increase in juvenile crabs now, but it could take years for them to mature to a catchable size. Scientists hope the crabbing season closure will allow the juvenile crabs to adapt and grow.
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