Effects of acute exposure to bifenthrin on some haematological, biochemical and histopathological parameters of rainbow trout (Oncorhynchus mykiss)

Abstract

: The effect of the pyrethroid, bifenthrin, on rainbow trout (<I>Oncorhynchus mykiss</I>) was assessed based on biochemical, haematological and histopathological examination of fish exposed to Talstar 10 EC pesticide preparation (active substance 100 g/l bifenthrin) at a concentration of 14.7 &mu;g/l. There was a significant (<I>P</I> < 0.01) decrease in plasma ammonia, and significant (<I>P</I> < 0.01) increase in glucose, creatine kinase, alkaline phosphatase and lactate dehydrogenase. Haematologically, fish showed a significant (<I>P</I> < 0.01) decrease in mean erythrocyte volume, erythrocyte haemoglobin, and band neutrophil granulocytes compared to controls. Degeneration of hepatocytes was observed histologically. The bifenthrin-based Talstar 10 EC pesticide preparation was therefore classified as a substance strongly toxic to fish.