Abstract
1. 1. The multiplicity of soluble esterases in Barbus tetrazona (tiger barb), B. conchonius (rosy barb), B. sachsi (gold barb) and B. titteya (cherry barb) have been compared utilizing polyacrylamide (vertical) gel electrophoresis. 2. 2. Eight separable zones of esterolytic activity were observed from liver and intestinal extracts of B. tetrazona, B. conchonius and B. sachsi, and nine separable zones in B. titteya. 3. 3. Tissue esterases within each species showed a specific profile, with species sharing common geographic origins displaying esterases with similar properties. 4. 4. Esterases were classified by employing eserine sulfate, DFP and sulfhydryl-group inhibitory agents.
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