EFFECT OF DIRECT AND PULSED DIRECT CURRENT ON BEHAVIORAL RESPONSE OF NILE TILAPIA (Oreochromis niloticus) | UTTAR PRADESH JOURNAL OF ZOOLOGY
We studied the behavioural reactions of Oreochromis niloticus when it was subjected to direct current (DC) and three low-frequency pulsed DC (PDC) (1 Hz, 3 Hz, 6 Hz). The goal of the research was to determine the threshold current densities (A/mm2) for electric field perception, galvanotaxis (involuntary movement towards the electrode), and narcosis (loss of equilibrium, unconsciousness). The effects of electrical exposure on opercular motions have been widely researched before and after. In comparison to PDC, the threshold values for all three responses were shown to be greater in DC. The threshold values for all three reactions (perception, taxis, and narcosis) were lowest in PDC 6 Hz and greatest in PDC 1 Hz, followed by continuous DC and PDC 3 Hz, among three forms of PDC (1, 3, and 6 Hz) used in the studies. In both DC sharp rise and PDC 3 Hz, anodal galvanotaxis was most efficiently demonstrated in 90% of test subjects. Due to the low current required, PDC 3 Hz is recommended over DC. In the case of DC, fishes restored opercular movements immediately after the current was removed, whereas in the case of PDC, fishes regained opercular movements 20 seconds to 1 minute after exposure. Although recovery after exposure in PDC was delayed by up to one minute, this can be overlooked because there was no fatality in this trial. As a result of the lower power usage, PDC 3 Hz may be a more sustainable solution than DC sharp rise.
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