Abstract
A highly specific and multipotential disinfectant, Aquagerm, was designed for using in aquatic farms by Research Group of Fazel Derakhshan Company (Tehran, Iran). Its effect on water pH, survival rate and behavior changes of fish as well as therapeutic effects on saprolegniasis and sterptococcosis were studied. This disinfectant reduced water pH to 2-4 units below the basal level at 1?100 and 1?200 dilutions during 30min of treatment. However, by 1?2000 and 1?2500 dilutions, pH reduction was only one unit at the same period. Interestingly, at recent dilutions pH was in optimum range which is suitable for cultivation. Furthermore, 1?2000 and 1?2500 dilutions did not cause any disorder in fish survival and behavior. This compound has bacteriostatic effect on Saprolegnia spp. in fish hatcheries. Our investigation showed that 1?2000 and 1?2500 dilutions made 82- 85 % survival of eggs in rainbow trout hatcheries. However, these dilutions were not suitable ones for reducing Streptococcus spp. to 108 bacteria per milliliter. It should be mentioned that these dilutions are too high for being used at farm condition.
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