Gingerich, W. H., Pityer, R. A., and Rach, J. J., 1990, Whole body and tissue blood volumes of two strains of rainbow trout (Oncorhynchus mykiss): Comparative Biochemistry and Physiology A, v. 97A, no. 4, p. 615-620. Abstract: Estimates of apparent packed cell, plasma and total blood volumes for the whole body and for 13 selected tissues were compared between Kamloops and Wytheville strains of rainbow trout (Oncorhynchus mykiss ) by the simultaneous injection of two vascular tracers, radiolabeled trout erythrocytes ( super(51)Cr-RBC) and radioiodated bovine serum albumin ( super(125)I-BSA). Whole body total blood volume, plasma volume and packed cell volume were slightly, but not significantly greater in the Wytheville trout, whereas, the apparent plasma volumes and total blood volumes in 4 of 13 tissues were significantly greater in the Kamloops strain. Keywords: volume, racial-studies, Salmo-gairdneri, Oncorhynchus-mykiss, serological-studies, blood, fish-physiology