Respiratory Characteristics of the Blood of Labeo Umbratus (SMITH) and Labeo Capensis (Smith)

Abstract

Various respiratory characteristics of mudfish blood were investigated. Oxygen and carbon dioxide contents of mixed venous blood were 1,17±0,53 and 11,35±1,65 vol. % respectively. Blood oxygen dissociation curves showed P₅₀ values of 11,84±3,1; 13,77±2,0 and 18,05±4,7 mm Hg at CO₂, concentrations of 0-1%, 4-5% and 9-10%. A marked Bohr effect of —0,59 was observed and the Haldane effect was found to be relatively low. No differences could be observed between the characteristics of L. umbratus and L. capensis blood.