Gingerich, W. H., Pityer, R. A., and Rach, J. J., 1987, Estimates of plasma,
packed cell and total blood volume in tissues of the rainbow trout (Salmo
gairdneri): Comparative Biochemistry and Physiology A, v. 87A, no. 2, p.
251-256.

Abstract: 

Total blood volume and relative blood volumes in selected tissues were
determined in non-anesthetized,  confined rainbow trout by using 
super(51)Cr-labelled trout erythrocytes as a vascular space marker. Mean  total
blood volume was estimated to be 4.09  plus or minus  0.55 ml/100 g, or about
75% of that estimated with  the commonly used plasma space marker Evans blue
dye. Relative tissue blood volumes were greatest in highly  perfused tissues such
as kidney, gills, brain and liver and least in mosaic muscle. Estimates of tissue
vascular  spaces, made using radiolabelled erythrocytes, were only 25-50% of
those based on plasma space markers. The  consistently smaller vascular volumes
obtained with labelled erythrocytes could be explained by assuming that 
commonly used plasma space markers diffuse from the vascular compartment.

Keywords: 

blood-circulation, volume, Salmo-gairdneri