Impacts of pesticide on the physico-chemical variables and zooplankton abundance of argulus sp. müller infected brood carp pond

Kaniz Fatema, Mohammad Mamun Chowdhury, Abu Tweb Abu Ahmed

Abstract


The study describes the impacts of organophosphate pesticide sumithion on physico-chemical variables and abundance of zooplankton of a commercial brood fish pond where the pesticide was used at monthly intervals to control the infection of Argulus sp. Compared to a control brood fish pond, notable differences were found in the monthly range of transparency, DO, free CO2, hardness, ammonia nitrogen, nitrate-N and in monthly abundance of rotifers, nauplius, copepods, and  cladocerans of the treated pond. The monthly range of transparency, pH, DO, free CO2, alkalinity, hardness and ammonia nitrogen  and nitrate-N varied from 15.5 to 29 cm, 7.5 to 9.5, 4.3 to 5.8 mg/l, 12.9 to 20.6 mg/l, 65 to 120 mg/l, 81 to 126 mg/l and 0.4 to 1.5 mg/l, 0.01 to 0.08, respectively in the treated pond, while in the control pond they varied from 22.1 to 30.1 cm, 7.2 to 8.5, 5.9 to 8.3 mg/l, 8.2 to 12.5 mg/l, 102 to 245 mg/l, 159 to 216 mg/l, 0.2 to 0.7 mg/l, 0.02 to 0.04 mg/l, respectively. The monthly abundance of rotifers, nauplius, copepods, cladocerans and ostracods varied from 425 to 1255 indiv/l, 10 to 100 indiv/l, 15 to 55 indiv/l, 5 to 40 indiv/l and 30 to 50 indiv/l in the treated pond, while they varied from 925 to 4320 indiv/l, 150 to 450 indiv/l, 50 to 260 indiv/l, 55 to 220 indiv/l and 20 to 200 mg/l in the control pond. The physico-chemical status and zooplankton abundance of the control pond indicate that the pesticide application considerably deteriorated the quality of water and decreased the zooplankton abundance of treated pond.


Keywords


Pesticide impact, Sumithion, Physico-chemical variables, Zooplankton abundance

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Dhaka University Journal of Biological Sciences ISSN 1021-2787 (Print) 2408-8501 (Online)