Fishing groups and tribes have filed a lawsuit challenging new endangered species protection guidelines for the Klamath River. The suit targets the biological opinion, which is an assessment of how the Bureau of Reclamation manages river flow, irrigation water and levels in Upper Klamath Lake to ensure protection of coho salmon and two species of sucker fish. The newest opinion was finalized earlier this year. The lawsuit filed by the Yurok Tribe, the Pacific Coast Federation of Fishermen’s Associations and the Institute for Fisheries Resource says the biological opinion is too permissive, allowing irrigation withdrawals at the expense of fish.