ACUTE TOXICITY OF DELTAMETHRIN (A SYNTHETIC PYRETHROID PESTICIDE) TO FISH
Dr. J. Chandra Sekhara Rao*, Pushpa Latha Manda, Anjali T. P. and Hema Sowjanya P.
ABSTRACT
In Ecotoxicology, acute toxicity tests are generally conducted to measure or evaluate the toxic effects caused by
various pollutants that reach aquatic ecosystems and show their impact on one or more species. In aquatic
ecosystems in general and freshwater ecosystems in particular, fish is a non-target species for the toxic impact of a
xenobiotic chemical and has been extensively used as a biological indicator to evaluate the degree of the impact of
the pollutant. Dose of a particular toxicant that is not high enough to kill an aquatic organism like fish are
associated with other changes like physiological, morphological, behavioural and biochemical alterations. Due to
the strict regulations on discharge standards or permissible limits for various toxic chemicals released into the
environment, more attention is being given on toxicity bioassays in recent years. Data obtained on the
concentration of a selected toxicant which is lethal to fish provide necessary information, apart from identifying a
border line limit above which fish is likely to be killed. Hence, in the present review an attempt has been made to
report the acute toxicity values of deltamethrin, a synthetic pyrethroid pesticide to various fish species.
Keywords: Aquatic pollution, Acute toxicity, Deltamethrin, Synthetic pyrethroid, Biological indicator, Bioassay.
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