In a complaint filed in U.S. District Court in Seattle on Tuesday, the tribes argue that the Coast Guard has failed to consult with the National Marine Fisheries Service over the impact of the tanker traffic it regulates on the killer whales.

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The Tulalip and Suquamish tribes are suing the Coast Guard, alleging a failure to protect endangered orcas from the risk of oil spills associated with tanker traffic in the Strait of Juan de Fuca.

In a complaint filed in U.S. District Court in Seattle on Tuesday, the tribes argue that the Coast Guard has failed to consult with the National Marine Fisheries Service over the impact of the tanker traffic it regulates on the killer whales. The tribes say the risk has increased significantly since the Canadian government approved the expansion of the TransMountain pipeline last November. That decision is expected to increase tanker traffic in the Strait of Juan de Fuca seven-fold.

Chief Petty Officer David Mosley in Seattle said the Coast Guard is reviewing the complaint.

The tribes are represented by the environmental law firm Earthjustice. They seek an order requiring the Coast Guard to avoid harm to the whales until the agency consults with the fisheries service.

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Individual Puget Sound orcas are identified by unique black and white markings or variations in their fin shapes, and each whale is given a number and a name. The Center for Whale Research on San Juan Island keeps the federal government’s annual census on the population.

Three families — the J, K, and L pods — are genetically and behaviorally distinct from other killer whales. They use unique calls to communicate with one another and eat salmon rather than marine mammals.

Their numbers have fluctuated in recent decades as they have faced threats from pollution, lack of prey and disturbance from boats. They were listed as endangered in 2005.