Wednesday, April 10, 2013

Supersized Crabs Bad News for Seafood Lovers

The giant crabs are coming. And they're hungry.

As the oceans absorb significant amounts of atmospheric carbon dioxide, the water becomes more acidic and carbon-rich, and these higher levels of carbon are giving rise to the supersized crabs.
That's bad news for oyster lovers: The shellfish are a favorite food of crabs, and big, ravenous crabs can wipe out an oyster bed in record time.
"Higher levels of carbon in the ocean are causing oysters to grow slower, and their predators — such as blue crabs — to grow faster," Justin Baker Ries, a marine geologist at UNC, told the Post.
Moreover, the fast-growing crabs have less meat in them, making this doubly bad news for fans of seafood.
It's been known for some time that as the oceans become more acidic, the shells of sea creatures — from microscopic plankton to oysters and scallops — are becoming thinner.
Nowhere is this change in ocean water chemistry more dramatic than in the coastal zones of thenortheastern United States. In a 2009 study published in the journal Geology, the UNC researchersfound that Chesapeake blue crabs grew nearly four times faster in tanks containing water with high levels of carbon than in low-carbon tanks. Fast-growing crabs also have insatiable appetites. In a 2011 experiment, UNC researchers placed mud crabs and oysters in a high-carbon tank environment.
The result was "like watching lions tear apart lambs," the Post reports, as the aggressive crabs ripped open oyster shells and gobbled up their insides.
By Marc Lallanilla, Assistant Editor | – 21 hrs ago

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