American Seafoods and affiliated shipping companies "changed their business model to trim even more costs from their operation, flouting the law in the process," attorneys representing the US Customs and Border Protection (CBP) agency told an Alaska federal court on Friday.

In court documents filed in connection with the ongoing dispute between the agency and Alaska pollock producers and shipping companies over alleged violations of the Jones Act related to how the firms ship product from Dutch Harbor, Alaska, to customers on the US East Coast, the CBP said that in April 2017 it received a letter from a third party alleging potential violations of the Jones Act and began "evaluating the matter."