Acute toxicity of potassium permanganate to Caspian roach Rutilus rutilus caspicus in two size classes and under different aeration conditions |
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Authors: | Seyyed Morteza Hoseini Ali Jafar Nodeh |
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Institution: | 1. Faculty of Fisheries and Environment, Department of Fisheries , Gorgan University of Agricultural Sciences and Natural Resources , Gorgan, Iran seyyedmorteza.hoseini@gmail.com smh8160@yahoo.com;3. Faculty of Fisheries and Environment, Department of Fisheries , Gorgan University of Agricultural Sciences and Natural Resources , Gorgan, Iran |
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Abstract: | Caspian roach, Rutilus rutilus caspicus, might experience potassium permanganate (PM) toxicity, because it is common and widely used disinfectant in fish rearing and propagation centers in Iran. Thus, acute toxicity (24-h-LC50) of PM was determined on Caspian roach in two size classes (small and large groups), under aerated and non-aerated conditions, using static non-renewal system. 24-h-LC50 for PM in Caspian roach was 3.2, 3, 3.2, and 2.8?mg?L?1 in large-aerated, large-non-aerated, small-aerated, and small-non-aerated groups, respectively. Results indicated that aeration was led to decrease in PM toxicity, regardless of size class. However, large fish showed more tolerance to PM toxicity compared to small ones, under non-aerated condition. It is concluded that aeration could decrease the toxicity of PM that seems to be due to the increase in PM degradation, derived from increase in water turbulence. It is suggested that 96-h-LC50 may be more suitable to determine the effects of fish size on PM toxicity than 24-h-LC50. |
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Keywords: | potassium permanganate Caspian roach toxicity LC50 |
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