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We have investigated the detailed behavioral responses of Oreochromis niloticus exposed to direct current (DC) and 3 low frequencies of pulsed DC (PDC) (1 Hz, 3 Hz, 6 Hz). The study was aimed to find out the threshold current densities (µA/mm²) for the perception of electric field, galvanotaxis (involuntary movement towards the electrode) and narcosis (loss of equilibrium, unconsciousness). Effects on opercular movements before and after electrical exposure was extensively studied. The threshold values for all three responses were found to be higher in DC in comparison with PDC. Among three types of PDC (1, 3 and 6 Hz) applied in the experiments, the threshold values for all the three reactions (perception, taxis and narcosis) were lowest in PDC 6 Hz and highest in PDC 1 Hz followed by continuous DC and PDC 3 Hz. Anodal galvanotaxis was most effectively shown in 90% test individuals in both DC sharp rise and PDC 3 Hz. However, PDC 3 Hz is preferred over DC due to low current requirement. In case of DC, opercular movements were regained immediately after the removal of current, whereas fishes regained opercular movements within 20seconds- 1 minute after exposure in PDC. Though recovery after exposure was delayed upto 1 minute in PDC, it can be ignored as there was no mortality in the present study. So PDC 3 Hz may be a more sustainable option over DC sharp rise due to lower power consumption.

Galvanotaxis, narcosis, Oreochromis niloticus, behavioral response, threshold

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CHAKRABORTY, N., BISWAS, K. P., & DE, T. K. (2021). EFFECT OF DIRECT AND PULSED DIRECT CURRENT ON BEHAVIORAL RESPONSE OF NILE TILAPIA (Oreochromis niloticus). UTTAR PRADESH JOURNAL OF ZOOLOGY, 42(10), 1-9. Retrieved from https://mbimph.com/index.php/UPJOZ/article/view/2119
Original Research Article


Halsband E, Halsband I. Electrofishing [English translation of Halsband and Halsband 1975 from German by R.W. McCauley, text only exclusive of reference list]: Canadian Translations in Fisheries and Aquatic Sciences. 1984;5048.

Dolan CR, Miranda LE. Immobilisation thresholds and electrofishing relative to fish size. Transactions of the American Fisheries Society. 2003;132:969-976.

Sharber NG, Carother SW. Influence of electrofishing pulse shape on spinal injuries in adult rainbow trout. North American Journal of Fisheries Management. 1988;8:117-122.

Snyder DE. Electrofishing and its harmful effects on fish, information and technology report USGS/BRD/ITR-2003-2002: US Government Printing Office, Denver, CO. 2003;149.

Ellis JE. Electrotaxic and narcotic responses of channel catfish to various electric pulse rates and voltage amplitudes, Prog. Fish Culturist. 1975;37(3):155–157.

Kolz AL. In-water electrical measurements for evaluating electrofishing systems: U.S. Fish and Wildlife Service Biological Report. 1993;1.

Meyer-Warrden. Electrical fishing. Rome: FAO Fisheries Study. 1957;7.

Halsband E. Basic principles of electric fishing. In: Vibert, R., (Eds.), Fishing with electricity, its applicationto biology and management: Farnham, Surrey: Fishing News (Books) Ltd. 1967;57–64.

Lamarque P. Electrophysiology of fish subject to the action of an electric field, In Vibert, R.(Eds.), Fishing with electricity, its application to biology and management London: Fishing News (Books) Ltd. 1967;65–92.

Kolz AL. A power transfer theory for electrofishing: U.S. Fish and Wildlife Service Fish and Wildlife Technical Report. 1989;22: 1–11.

Sharber NG, Black JS. Epilepsy as a unifying principle in electrofishing theory: A proposal. Transactions of the American Fisheries Society. 1999;128: 666-671.

Ahmadi, et al. True electrotaxis and threshold voltages in the american crayfish Procambarus clarkia. Journal of Fisheries and Aquatic Science. 2008;3:228-239.
DOI: 10.3923/jfas.2008.228.239.

Beaumont WRC, Taylor AAL, Lee MJ, Welton JS. Guidelines for electric Fishing Best Practice. R &D Technical Report W2- 054/ TR, Swindon: Environment Agency; 2002.

Pajos TA, Weise JG. Estimating populations of larval sea lamprey with electrofishing sampling methods. North American Journal of Fisheries Management. 1994;14:580-587.

United States Army Corps Engineers (USACE), Great Lakes and Mississippi River Inter basin Study (GLMRIS) Report; 2015.

Deines MA, Wittman EA, Deines MJ, Lodge MD. Tradeoffs among ecosystem services associated with global tilapia introductions. Reviews in Fisheries Science & Aquaculture. 2016;24(2):178-191.

Fitzsimmons K, Watanabe W. Tilapia (Family: Cichlidae) In: N.R. Le François, M. Jobling, C. Carter and P.U. Blier, editors. Finfish Aquaculture Diversification. C.A.B. International, Oxfordshire, UK. 2010;375- 397.

Barham WT, Schoonbee HJ, Visser JGJ. The use of electronarcosis as anaesthetic in the cichlid, Oreochromis mossambicus (Peters), III, the effects of changing physical and electrical parameters on the narcotizing ability of half-wave rectified currents: Onderstepoort. Journal of Veterinary Research. 1989;56:67–71.

Robinson E. A Study of the use of Alternating Current fro Electroanaesthesia in Salmo gairdneri and Oreochromis niloticus. BSc thesis, University of Stirling, 1984;26.

Roques JAC, et al. Physiological and behavioral responses to an electrical stimulus in mozambique Tilapia (Oreochromis mossambicus). Fish Physiology and Biochemistry. 2012;38:1019-1028.

Venturini FP, et al. Effects of different stunning methods on blood markers and enzymatic activity of stress response of Tilapia (Oreochromis niloticus). Italian Journal of Animal Science. 2018;17:1094- 1098.

Vincent R. River electrofishing and fish population estimates: Progressive Fish-Culturist. 1971;33:163–169.

Beaumont WRC. Electricity in fish research and management: Theory and Practice, Second Edition: Willey Blackwell; 2016.

Haskell DC, MacDougal J, Geduldig D. Reactions and motion of fish in a direct current electric field: New York Fish and Game Journal. 1954;1:47–64.

Wydoski RS, Effects of electric current on fish and invertebrates [mimeo]: U.S. Fish and Wildlife Service, National Fisheries Center—Leetown, Kearneysville, West Virginia; 1980.

Emery L. The physiological effects of electrofishing: Cal-NEA Wildlife Transactions. 1984;59–72.

Muth RT, Rupper, JB. Effects of electrofishing fields on captive embryos and larvae of razorback sucker: North American Journal of Fisheries Management. 1997;17:160–166.

Meismer SM. Effects of electrofishing fields on captive sub adult Colorado pike minnow and adult rainbow trout: Master’s thesis, Colorado State University, Fort Collins; 1999.

Bird DJ, Cowx IG. The selection of suitable pulsed currents for electric fishing in waters. Fisheries Research. 1993;18(3-4):363-376.

Stewart PAM. Electrified barriers for marine fish. In: Cowx I.G. (Eds.) Developments in Electric Fishing. Fishing News Books, Blackwell Scientific Publications. 1990;243-255.

Lamarque P. Electrophysiology of fish in electric fields, in Cowx, I.G., and Lamarque, P., eds., Fishing with electricity, applications in freshwater fisheries management: Oxford, England, Fishing News Books, Blackwell Scientific Publications, Ltd. 1990;4–33.

Biswas KP, Karmakar SP. Response of fishes to the underwater DC field. Fishery Technology. 1976;13:91- 100.

Chmielewski A, Cuinat R, Dembinski W, Lamarque P. Fatigue and mortality effects in electrical fishing. Polskie Archiwum Hydrobiologii. 1973;20:341-348.

Mitton CJA, McDonald DG. Consequences of pulsed DC electrofishing and air exposure to rainbow trout (Onchorhynchus mykiss): Canadian Journal of Fisheries and Aquatic Sciences. 1994;51:1791-1798.

Kynard B, Lonsdale E. Experimental study of galvanonarcosis for rainbow trout (Salmo gairdneri) immobilization: Journal of the Fisheries Research Board of Canada. 1975; 32:300.
DOI: 10.1139/f75-031