The Fish and Wildlife Service has released it biological opinion concerning the management of the Missouri River. It calls for increased flows from upstream dams in the Spring and the discontinuation of navigation along the Missouri for 3-4 weeks in the middle of summer. The Service says the moves will protect the endangered pallid sturgeon, least tern and piping plover. Brigadier General Carl Strock of the U.S. Army Corps of Engineers acknowledges the changes would greatly curtail navigation and could end the navigation industry on the Missouri. He says the Corps will look at some alternate proposals, but will proceed with the goal of rehabilitating those endangered species.