Toxic effects of disyston and furadan on the bimodal pattern of oxygen consumption in the climbing perch, Anabas testudineus (Bloch) |
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Authors: | R Bakthavathsalam Y Srinivasa Reddy |
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Affiliation: | Department of Zoology, Annamalai University, Annamalainagar-608 002, Tamilnadu, India |
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Abstract: | A significant change was noted in the aquatic (vO2), aerial (VO2) and total [(v + V)O2] consumption of Anabas testudineus (Bloch) exposed to 4.0 and 10.5 mg l−1 disyston and 0.56 and 1.56 mg l−1 furadan. After 1 h of exposure to all the concentrations significant decreases were noticed in the (v + V)O2. Though significant increases were noted in all the measures of respiration after 3 h of exposure in both the pesticides, their effects vary from one exposure period to another. The fish held in 4.0 mg l−1 disyston and 0.56 mg l−1 furadan concentrations resumed normal pattern of bimodal respiration after 120 and 96 h respectively. Further the pattern of changes in (v + V)O2 closely followed the changes observed in VO2 rather than vO2 indicating that the fish held in pesticide medium predominantly relied on aerial respiration. A direct correlation was noticed between the VO2 consumption and the surfacing frequency of the fish exposed to disyston and furadan. Relatively furadan is more toxic than disyston to Anabas testudineus if their effects on O2 consumption are taken into consideration. |
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Keywords: | toxicity bimodal respiration air-breathing disyston furadan Anabas testudineus |
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