Giant jellies invade Gulf of Mexico threatening shrimp fishery

Giant "jellies" - up to two feet in diameter - have taken up residence in the northern Gulf of Mexico causing swimmers and fishermen to do a double take when they first spy them. Known as the "Spotted Jellyfish, " these creatures don't threaten swimmers because their sting is mild compared to native jellyfish like the Sea Nettle. However, the jellies' threat to the area's ecosystems is yet to be determined. Similar alien jellyfish have caused major disruptions in marine fisheries in Europe - in some cases driving out other marine life.

"One of the biggest worries is that these jellies will feed directly on the eggs and larvae of the area's fish, shrimp and crabs. And doing so could have a serious effect on the commercial fisheries on the coast," says Monty Graham, senior marine scientist and Mississippi-Alabama Sea Grant-funded researcher at the Dauphin Island Sea Lab in Alabama.

Gulf of Mexico shrimp are the nation's second most valuable fishery, trailing only Alaska salmon. And the Gulf's commercial fisheries landings account for 40% of all U.S commercial landings.

Native to Australian coastal waters, the Spotted Jellyfish (Phyllorhiza punctata) have been migrating to the Caribbean for the past two decades, but have not been seen this far north. Their coastal invasion began in early June when it is believed the jellies, caught in the "Loop Current" that circulates through the Gulf, broke off the Loop into an eddy south of Alabama and the Florida panhandle. Satellite imagery from the Naval Research Laboratory at the Stennis Space Center confirms this.

At the present time the jellies seem to have taken up residence and spread out across the Mississippi Sound and along the Louisiana and Texas coasts to the west side of the Mississippi River. Arial surveys have shown that these jellyfish congregate in large patches - in some cases more than 2,000 jellyfish clustering in an area the size of a football field.

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Contact: Ben Sherman
National Sea Grant College Program

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