In an action that influences how water will move through the Sacramento-San Joaquin Delta, federal fisheries agencies have issued new biological opinions to guide operation of federal and state water projects. Representatives of farmers and water districts said the opinions released last week promise to enhance the flexibility of the California water system. The U.S. Fish and Wildlife Service and NOAA Fisheries determined that the proposed long-term operations of the federal Central Valley Project and State Water Project do not jeopardize the continued existence of protected salmon and delta smelt in the bay-delta watershed.