PORTLAND (AP) — Sweden isn’t giving up on a long-running battle with the U.S. and Canada over lobsters that have turned up in Swedish waters.

Officials with Sweden told the Associated Press that their country is working on a new proposal about how to deal with American lobsters. A controversy about whether American lobsters are invasive in Swedish waters has simmered for almost a year.

Sweden had wanted the European Union to consider a ban of imports of U.S. lobsters. That call came after Sweden said it had found 32 American lobsters in its waters.

European Union officials turned away that request in October after American and Canadian scientists and politicians raised concerns about a lack of evidence that the lobsters warranted such a sweeping ban. But Swedish officials told the AP that the country remains concerned that American lobsters could interfere with European lobsters, which have economic value.

“We are preparing a new proposal on national and regional measures on the American lobster that will be presented for the Swedish government this winter,” said Sofia Brockmark of the Swedish Agency for Marine and Water Management.

Brockmark and other Swedish officials did not provide more specifics about the upcoming proposal, other than that it will address invasive lobsters with countrywide and regional measures as opposed to an international ban.

Maine is the biggest lobster fishing state in the U.S., and the New England lobster industry dug in against Sweden’s proposed ban. America sends about $150 million in lobster to the European Union annually. Canada also sells the same species of lobster to Europe.

Beth Casoni, executive director of the Massachusetts Lobstermen’s Association, said her organization is working with others in the industry, as well as American and Canadian government agencies, to help prevent American lobsters from escaping into the wild in Europe.