Staff from the Aquatic Ecosystem Branch of the New Mexico Ecological Services Field Office, Fish and Wildlife Service, completed a biological opinion for the U.S. Bureau of Reclamation's proposed Pecos River dam operations through the summer 2006.  The project is located on the Pecos River between Santa Rosa and Brantley Reservoirs in eastern New Mexico.  The proposed project is for water deliveries for irrigation districts and Pecos Compact delivery through October 31, 2006.  The biological opinion, a requirement of the Endangered Species Act, analyzed the effects of water operations on the threatened Pecos bluntnose shiner and its designated critical habitat and the endangered interior least tern.  Participation by the New Mexico Fishery Resources Office of the Fish and Wildlife Service, provided valuable data and scientific expertise for the Pecos bluntnose shiner.