Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 20, Issue 4, 2018; Page No.(1200-1208)

TOXICITY AND BEHAVIOURAL CHANGES IN THE FRESH WATER COMMON CARP CYPRINUS CARPIO EXPOSED TO PERMETHRIN A SYNTHETIC PYRETHROID OF CLASS I TYPE

R. BALAKRISHNA NAIK, N. GOPALA RAO AND G. SRINIVASARAO

Abstract

Acute toxicity tests are conducted to the fish Cyprinus carpio employing both static and continuous flow through tests in the laboratory, using the toxicant Permethrin, a synthetic Pyrethroid of class I type. The tests are conducted for 24 hrs, 48 hrs, 72 hrs and 96 hrs and the values are respectively 4.2 μg/L, 3.75 μg/L, 3.01 μg/L in static renewal and 2.7 μg/L, 3.09 μg /L, 2.7 μg/L and 2.74 μg/L for technical grade in continuous flow through system. Using Permethrin 25%EC, a commercial formulation, the values are 6.30 μg/L, 5.3 μg/L, 4.43 μg/L and 3.72 μg/L in static renewal system and 5.3 μg/L, 4.36 μg/L, 3.54 μg/L and 2.73 μg/L in continuous flow through system respectively. Loss of equilibrium followed by drowning to the bottom, chromatophores decolourisation and mucous secretion are some of the behavioural changes observed as indices of toxicity.

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