Abstract
The aim of this study was to assess the effect of deltamethrin on rainbow trout ( Oncorhynchus mykiss). Control and experimental group of fish were exposed to Decis EW 50 pesticide preparation (active substance 50 g/l of deltamethrin). The acute semistatical toxicity test lasting 96 h was performed on rainbow trout juveniles. The 96hLC 50 value of Decis EW 50 was 0.02 mg/l. Examination of haematological and biochemical profile and histological tissue examination was performed on 1–2-year-old rainbow trout after 96 h of exposure to Decis EW 50 in a concentration of 0.02 mg/l. The experimental group showed significantly lower values ( p < 0.05) of plasma glucose, alanine aminotransferase, cholinesterase and significantly higher ( p < 0.05) values of erythrocyte count, haemoglobin content, haematocrit and plasma total protein, albumins, ammonia, aspartate aminotransferase, creatinekinase and calcium compared to the control group. The deltamethrin-based Decis EW 50 pesticide preparation was classified among substances strongly toxic for fish.
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