Tribe, groups vow to sue to guard rare fish The Confederated Tribe of Goshutes and two conservation organizations filed notice Wednesday that they plan to sue the Interior Department for not responding to a petition to put a rare Utah fish on the federal list of threatened or endangered species. The least chub, a small minnow found only in Utah's Bonneville Basin, now lives in just six fragile wild populations, three in the Snake Valley. Along with the tribe, the Great Basin chapter of Trout Unlimited and Wild Utah Project claim the Southern Nevada Water Authority's plans to tap Snake Valley groundwater to feed Las Vegas growth threatens the least chub's survival. The groups filed their petition to protect the fish in June 2007. Under the Endangered Species Act, federal officials should have responded with a finding of whether the petition's claims were sufficient to warrant further consideration within 90 days. A decision on whether to list the fish then should have come within a year....