This paper describes fish remains included among the archaeological materials recovered from the Karlo site (CA-Las-7), Lassen County, California, during the summer of 1955 by Francis A. Riddell and his associates, of the University of California Archaeological Survey (Riddell 19566:63, 1960^:3). In using this designation rather than Las-7, which was used for the Karlo site by Riddell (1960a:2), I follow Heizer (1968).