Effect of formalin treatment on saltwater tolerance in Caspian roach (Rutilus rutilus caspicus)
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2012, Vol 3, Issue 5
Abstract
The effect of formalin exposure on subsequent saltwater tolerance was investigated in Caspian roach (Rutilus rutilus caspicus). Fish were subjected to 0 (control), 10, 15 and 25 ppm formalin over 0 (control), 12, 24 and 168 h (4*4 treatments; 6 tanks per treatment) as well as 25, 50,100, and 150 ppm formalin over 0.5 and 1 h 4*2 treatments; 6 tanks per treatment). Thereafter, half of each treatment's tanks (3 tanks) were subjected to formalinfree freshwater and the rests were subjected to formalin-free saltwater (12 ppt NaCl) and mortality was recorded at 0, 72 and 168 h exposure. Results showed decrease in saltwaterinduced mortality with increase in formalin exposure from 12 to 168 h, particularly in fish exposed to 25 ppm formalin. However, increment in formalin exposure from 0.5 to 1 h caused increase in saltwater-induced mortality, particularly in formalin concentrations of 100 and 150 ppm. Increase in saltwater tolerance after 168 h formalin exposure might be due to adaptation mechanisms development or suppression in stress induced by formalin exposure. Decrease in saltwater tolerance after 1 h, compared to 0.5 h, formalin exposure might be due to cumulative effect of the two stressors (formalin and saltwater exposure).
Authors and Affiliations
Melika Ghelichpour| Department of Fisheries, Faculty of Fisheries and Environment, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran., Soheil Eagderi*| University of Tehran, Faculty of Natural Resources, Department of Fisheries, Karaj, Iran, P.O. Box: 31585- 4314.Soheil.Eagderi@Ut.ac.ir
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