The fish identification key for the Tracy Fish Collection Facility (TFCF), Tracy, California, jointly prepared by Bart W. Bird and Paul F. Raquel for the U.S. Department of the Interior, Bureau of Reclamation and the U.S. Fish and Wildlife in 1977, was revised for this report. This revised key will assist employees at TFCF to identify the different species that are captured in 10-minute collection samples used for estimating salvage. The key covers 56 species from 22 families salvaged at the TFCF. The key has a secondary purpose in that it serves as a reference for biologists working in the southern region of the Sacramento-San Joaquin Delta.