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Toxicity of organophosphorus pesticide sumithion on larval stages of stinging catfish Heteropneustes fossilis

Chinese Journal of Oceanology and Limnology 2017年第1期35卷 109-114页

作者： Md.SHAHJAHAN Md.Farajul KABIR Kizar Ahmed SUMON lipi rani bhowmik Harunur RASHID Department of Fisheries Management Bangladesh Agricultural University Mymensingh 2202 Bangladesh Sado Marine Biological Station Faculty of Science Niigata University Sado Niigata 952-2135 Japan Department of Aquatic Ecology and Water Quality Management Wageningen University Wageningen University and Research Centre P.O. Box 47 6700 The Netherlands Science and Math Program Asian University for Women Chittagong 4000 Bangladesh

Sumithion is widely used to control brittle in paddy fields and tiger bug in fish larval rearing ponds. The objective of this study was to elucidate the toxic effects of sumithion on larval stages of stinging catfish Heteropneustes fossilis. Larvae were exposed to two concentrations(150 and 250 μg/L) of sumithion with one control in three replicates of each. Larvae samples were collected at 20- and 24-h intervals followed by observation under a digital microscope. Exposures of stinging catfish larvae to sumithion produced deformities including irregular head shape, lordosis, yolk sac edema, body arcuation, tissue ulceration, etc. The mortality rates of larvae were significantly increased in response to increase in sumithion concentrations. Furthermore, around 30% of the total adult stinging catfish reared in sumithiontreated aquaculture ponds were found to be deformed permanently. These findings highlight that exposure of stinging catfish to sumithion at the critical and sensitive stages in their life cycle may significantly reduce the number of returning adults. Therefore, the use of sumithion for crop protection needs to be considered carefully and alternatives to sumithion should to be developed for controlling aquatic insects in aqua-ponds during larval rearing.

关键词： environment organophosphorus pesticide fish toxicity

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