Comparison of Blood Volume in Animals with Open and with Closed Circulatory Systems

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Abstract
The vols. of circulatory fluids were measured by dilution of the dye T-1824 and of Na thiocyanate in crayfish, fresh-water mussels, frogs and bullheads. In crayfish the specific gravity of the body is approx. 20% higher than that of blood and in mussels 6% higher, hence unlike in vertebrates, the blood vol. as percent of body vol. is larger than as percent of body wt. The dye T-1824 complexes with blood protein in crayfish and mussel. The avg. T-1824 vol. in crayfish is 25.1% and SCN vol. 25.6% of body wt.; that is, the blood vol. is approx. 30.5% of body vol. In mussels the T-1824 vol. averaged 9.5 and the thiocyanate vol. 9.0% of body vol.; these values may be low because of the sluggish circulation. In frogs the T-1824 vol. averaged 7.0% and NaCNS vol. 27% and total blood vol. 8.0% of body wt. In bullheads the avg. T-1824 vol. was 1.25%, blood vol. 1.77% and NaCNS vol. 4.0% of body wt. Apparently thiocyanate and T-1824 measure similar vols. in animals with open circulations and blood vol. is less in closed than in open circulatory systems.

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