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Live Canadian lobsters are mysteriously turning up in U.K. traps, and British fishermen and biologists suspect that the imported crustaceans are being illegally “liberated” into the North Sea.

“I really hope Canadian lobsters don’t become established here,” said Magnus Johnson, a marine biologist at the University of Hull, in an email to the National Post.

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Canadian lobsters are faster, stronger and more aggressive than their Old World counterparts, meaning the foreigners could cause widespread ecological damage if they are allowed to get a toehold in British waters.

On Monday, U.K. fishing authorities came upon a female North American lobster in a holding tank in Hartlepool, a town on England’s northeast coast. Earlier this year, another foreign lobster showed up across the North Sea in Gullmar Fjord, Sweden.

“They are found occasionally near Bridlington [a shellfishing port on the coast of Yorkshire],” Mike Cohen with the local Holderness Fishing Industry Group told The Telegraph.