Effect of different sublethal concentrations of Manganese on the levels of cortisol in Garra gotyla gotyla
نویسندگان
چکیده
The objective of this study was to evaluate the possible effects of manganese (Mn) exposure on variations of cortisol levels in Garra gotyla gotyla. LC50 value of manganese after 96 hours was found to be 3.2mg/l for Garra gotyla gotyla. Three replicates of 10 fishes were subjected to three sub-lethal concentrations of manganese i.e. 0.64mg/l, 1.28mg/l and 1.92mg/l (20%, 40% and 60% respectively of LC50value of manganese) for 1, 5 & 9 weeks. Blood samples were isolated from the fish following the exposure to measure the levels of cortisol and compared to the control group. We observed significant increase(p<0.01) in the levels of cortisol of three groups of fish after 1st week of exposure to three doses of manganese as well as significant decrease in the cortisol of three groups exposed for 5th & 9thweek. The rate of decrease in group III (exposed to1.92 mg/l of Mn) was higher than that of group I & II (exposed to 0.64 mg/l of Mn and 1.28 mg/l of Mn).
منابع مشابه
Length-weight relationship of sucker head, Garra Gotyla Gotyla (Gray, 1830) in different rivers of Nepal and the influence of monsoon
Size structure data particularly that of length and weight is very important fisheries management tool, which is also applied to assess the health, habitat and integrity of the rivers. Nepal is tremendously rich in both fisheries and water resource and thus, this analysis is very important. However, this kind of analysis is not common in fisheries studies and hence the size structure informatio...
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