Outline. Electrofishing: Definition and Uses. Effects of Electrofishing on Fish Health and Survival
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1 Effects of Electrofishing on Fish Health and Survival by Russell J. Bohl Department of Forestry Wildlife and Fisheries University of Tennessee, Knoxville, TN Outline Electrofishing background information Implications for populations Implications for endangered fish Electrofishing effects on survival for Embryos Juveniles Adults Future research needs SDAFS.org Electrofishing: Definition and Uses Use of waterborne electric fields to capture fish Smith-Root.com Used in most freshwater habitats Often considered an essential technique by fisheries managers
2 Electrofishing: Definition and Uses Equipment: Either boat or backpack electroshockers Generator (or battery), voltage control, and electrodes Electric output: Voltage controlled by operator Electric waveform Alternating Current (AC) Direct Current (DC) Pulsed Direct Current (PDC) Electrofishing: Definition and Uses Voltage Time Electrofishing: Definition and Uses Environmental factors impacting waterborne electric field intensity Conductivity Choosing voltage Waveform Conductivity Target species
3 Electrofishing for Brook Trout in GSMNP Conductivity = ~20 µs/cm Voltage selection = ~ V Waveform = AC Outline Electrofishing background information Implications for populations Implications for endangered fish Electrofishing effects on survival for Embryos Juveniles Adults Future research needs Implications for Populations McMichael et al. (1998): Frequency of injury decreases with increasing spatial scale (sample, reach, stream scales) Insignificant proportion of the population will be impacted when viewed at the stream scale.
4 Smith-Root.com Illustration of McMichael et al. (1998) Large Arrows indicate Stream Scale Sample Scale Reach Scale Outline Electrofishing background information Implications for populations Implications for endangered fish Electrofishing effects on survival for Embryos Juveniles Adults Future research needs Implications for Endangered Fish Nielsen (1998): Loss of even one individual is unacceptable and considered take under ESA If a small isolated population of fish is exposed, high mortality could have devastating effects on the population
5 During spawning season, multiple life history stages can be exposed to electric fields Fish that aggregate to spawn would be particularly susceptible Potential population level effects if the electric field is lethal
6 Outline Electrofishing background information Implications for populations Implications for endangered fish Electrofishing effects on survival for Embryos Juveniles Adults Future research needs Effects of Electrofishing on Fish Survival All life history stages: Mortality increases with electric field intensity (Dolan et al. 2002, Henry et al. 2003) Differences in susceptibility exist between species (Meismer 1999, Henry et al. 2004, Henry and Grizzle 2004) Effects of Electrofishing on Fish Survival
7 Effects of Electrofishing on Embryo Survival Zfin.org Certain developmental stages are more susceptible than others (Dwyer et al. 1993, Henry and Grizzle 2004) DC is more lethal than PDC (Henry and Grizzle 2004) Embryos shocked at later developmental stages can hatch prematurely (Henry and Grizzle 2004) Effects of Electrofishing Zfin.org on Embryos Early developmental stages particularly susceptible to electroshock (Dwyer et al. 1993, Henry and Grizzle 2004 ) Pre-epiboly Epiboly-Eyed Eyed Effects of Electrofishing on Embryos DC is more lethal than PDC (Henry and Grizzle 2004) Zfin.org
8 Effects of Electrofishing on Larvae/Juveniles Newly transformed juveniles are more susceptible than larvae and older juveniles (Henry et al. 2003) PDC can cause mortality in larvae and juveniles (Henry et al. 2004) Effects of Electrofishing on Larvae/Juveniles Newly transformed juveniles are more susceptible than larvae and older juveniles (Henry et al. 2003) Effects of Electrofishing on Adults AC is more lethal than PDC or DC (Pratt 1955, Taylor et al. 1957) Larger fish are more vulnerable to electroshock-induced mortality? Greater size = More responsive to electroshockshock = More injury = More mortality?
9 Effects of Electrofishing on Adults -AC is more lethal than PDC or DC (Pratt 1955, Taylor et al. 1957) Outline Electrofishing background information Implications for populations Implications for endangered fish Electrofishing effects on survival for Embryos Juveniles Adults Future research needs Future Research Needs Investigate the impact of size on injury and mortality Examine why embryos are susceptible to DC while adults are more vulnerable to AC and PDC Find the most harmful waveform to larvae/juveniles Compare AC/DC/PDC vulnerability in one study
10 References Dolan, C.R., L.E. Miranda, and T.B. Henry Electrofishing for crappies: electric settings influence immobilization efficiency, injury, and mortality. North American Journal of Fisheries Management 22 (4): Dwyer, W.P., W.A. Fredenburg, and D.A. Erdahl Influence of electroshock and mechanical shock on survival of trout eggs. North American Journal of Fisheries Management 13: Godfrey, H Mortalities among developing trout and salmon ova following shock by direct-current electric fishing gear. Journal of the Fisheries Research Board of Canada 14: Henry, T.B., J.M. Grizzle, and M.J. Maceina Electroshocking-Induced Mortality of Four Fish Species during Posthatching Development. Transactions of the American Fisheries Society 132: Henry, T.B. and J.M. Grizzle Survival of largemouth bass, bluegill and channel catfish embryos after electroshocking. Journal of Fish Biology 64: References Continued Henry, T.B., J.M. Grizzle, C.E. Johnston, and J.A. Osbourne McMichael, G.A., Fritis, A.L., and T.N. Pearsons Electrofishhing injury to stream salmonids: injury assessment at the sample, reach, and stream scale. North American Journal of Fisheries Management 18: Meismer, S.M Effects of electrofishing fields on captive subadult Colorado pikeminnow and adult rainbow trout. Master s thesis, Colorado State University, Fort Collins. Pratt, V.S Fish mortality caused by electric shockers. Transactions of the American Fisheries Society 84: Taylor, G.N., L.S. Cole, and W.F. Sigler Galvanotaxic response of fish to pulsating direct current. Journal of Wildlife Management 21: Nielsen, J.L Scientific sampling effects: electrofishing California s endangered fish populations. Fisheries 23 (12): Questions/Comments
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