Aug. 7 - WorldCatch News Network - Scientists fear millions of Australian spotted jellyfish invading the Gulf of Mexico will threaten coastal sea life from Florida to Louisiana.

"I can't remember seeing any marine organism in concentration like that," said Vernon Asper, a marine science professor from Biloxi, Miss., after seeing hundreds of thousands - maybe millions - of the jellyfish while flying over the Mississippi Sound.

"I've never seen a school of fish that was that big that had that much biomass.