Efficiency of electrofishing in turbid lowland rivers

Implications for measuring temporal change in fish populations

Jarod P. Lyon, Tomas Bird, Simon Nicol, Joanne Kearns, Justin O'Mahony, Charles R. Todd, Ian G. Cowx, Corey J A Bradshaw

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

To quantify how electro fishing capture probability varies over time and across physiochemical and disturbance gradients in a turbid lowland river, we tagged between 68 and 95 fish·year-1 with radio transmitters and up to 424 fish·year-1 with external and passive integrated transponder (PIT) tags. We surveyed the site noninvasively using radiotelemetry to determine which of the radio-tagged fish were present (effectively closing the radio-tagged population to emigration) and then electrofished to estimate the proportion of available fish that were captured based on both this and standard mark-recapture methods. We replicated the electrofishing surveys three times over a minimum of 12 days each year, for 7 years. Electrofishing capture probability varied between 0.020 and 0.310 over the 7 years and between four different large-bodied species (Murray cod (Maccullochella peelii), trout cod (Maccullochella macquariensis), golden perch (Macquaria ambigua ambigua), and silver perch (Bidyanus bidyanus)). River turbidity associated with increased river discharge negatively influenced capture probability. Increasing fish length increased detection of fish up to 500 mm for Murray cod, after which capture probability decreased. Variation in capture probability in large lowland rivers results in additional uncertainty when estimating population size or relative abundance. Research and monitoring programs using fish as an indicator should incorporate strategies to lessen potential error that might result from changes in capture probabilities.

Original languageEnglish
Pages (from-to)878-886
Number of pages9
JournalCanadian Journal of Fisheries and Aquatic Sciences
Volume71
Issue number6
DOIs
Publication statusPublished - 1 Jan 2014
Externally publishedYes

Fingerprint

electrofishing
lowlands
rivers
fish
Maccullochella peelii peelii
river
radio frequency identification
radio
Maccullochella
Bidyanus bidyanus
mark-recapture method
radio transmitters
transponders
radiotelemetry
radio telemetry
emigration
perch
river discharge
silver
turbidity

Cite this

Lyon, Jarod P. ; Bird, Tomas ; Nicol, Simon ; Kearns, Joanne ; O'Mahony, Justin ; Todd, Charles R. ; Cowx, Ian G. ; Bradshaw, Corey J A. / Efficiency of electrofishing in turbid lowland rivers : Implications for measuring temporal change in fish populations. In: Canadian Journal of Fisheries and Aquatic Sciences. 2014 ; Vol. 71, No. 6. pp. 878-886.
@article{064850ec0246441898c1e11130683749,
title = "Efficiency of electrofishing in turbid lowland rivers: Implications for measuring temporal change in fish populations",
abstract = "To quantify how electro fishing capture probability varies over time and across physiochemical and disturbance gradients in a turbid lowland river, we tagged between 68 and 95 fish·year-1 with radio transmitters and up to 424 fish·year-1 with external and passive integrated transponder (PIT) tags. We surveyed the site noninvasively using radiotelemetry to determine which of the radio-tagged fish were present (effectively closing the radio-tagged population to emigration) and then electrofished to estimate the proportion of available fish that were captured based on both this and standard mark-recapture methods. We replicated the electrofishing surveys three times over a minimum of 12 days each year, for 7 years. Electrofishing capture probability varied between 0.020 and 0.310 over the 7 years and between four different large-bodied species (Murray cod (Maccullochella peelii), trout cod (Maccullochella macquariensis), golden perch (Macquaria ambigua ambigua), and silver perch (Bidyanus bidyanus)). River turbidity associated with increased river discharge negatively influenced capture probability. Increasing fish length increased detection of fish up to 500 mm for Murray cod, after which capture probability decreased. Variation in capture probability in large lowland rivers results in additional uncertainty when estimating population size or relative abundance. Research and monitoring programs using fish as an indicator should incorporate strategies to lessen potential error that might result from changes in capture probabilities.",
author = "Lyon, {Jarod P.} and Tomas Bird and Simon Nicol and Joanne Kearns and Justin O'Mahony and Todd, {Charles R.} and Cowx, {Ian G.} and Bradshaw, {Corey J A}",
year = "2014",
month = "1",
day = "1",
doi = "10.1139/cjfas-2013-0287",
language = "English",
volume = "71",
pages = "878--886",
journal = "J. FISH. RES. BOARD CANADA",
issn = "0706-652X",
publisher = "National Research Council of Canada",
number = "6",

}

Efficiency of electrofishing in turbid lowland rivers : Implications for measuring temporal change in fish populations. / Lyon, Jarod P.; Bird, Tomas; Nicol, Simon; Kearns, Joanne; O'Mahony, Justin; Todd, Charles R.; Cowx, Ian G.; Bradshaw, Corey J A.

In: Canadian Journal of Fisheries and Aquatic Sciences, Vol. 71, No. 6, 01.01.2014, p. 878-886.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Efficiency of electrofishing in turbid lowland rivers

T2 - Implications for measuring temporal change in fish populations

AU - Lyon, Jarod P.

AU - Bird, Tomas

AU - Nicol, Simon

AU - Kearns, Joanne

AU - O'Mahony, Justin

AU - Todd, Charles R.

AU - Cowx, Ian G.

AU - Bradshaw, Corey J A

PY - 2014/1/1

Y1 - 2014/1/1

N2 - To quantify how electro fishing capture probability varies over time and across physiochemical and disturbance gradients in a turbid lowland river, we tagged between 68 and 95 fish·year-1 with radio transmitters and up to 424 fish·year-1 with external and passive integrated transponder (PIT) tags. We surveyed the site noninvasively using radiotelemetry to determine which of the radio-tagged fish were present (effectively closing the radio-tagged population to emigration) and then electrofished to estimate the proportion of available fish that were captured based on both this and standard mark-recapture methods. We replicated the electrofishing surveys three times over a minimum of 12 days each year, for 7 years. Electrofishing capture probability varied between 0.020 and 0.310 over the 7 years and between four different large-bodied species (Murray cod (Maccullochella peelii), trout cod (Maccullochella macquariensis), golden perch (Macquaria ambigua ambigua), and silver perch (Bidyanus bidyanus)). River turbidity associated with increased river discharge negatively influenced capture probability. Increasing fish length increased detection of fish up to 500 mm for Murray cod, after which capture probability decreased. Variation in capture probability in large lowland rivers results in additional uncertainty when estimating population size or relative abundance. Research and monitoring programs using fish as an indicator should incorporate strategies to lessen potential error that might result from changes in capture probabilities.

AB - To quantify how electro fishing capture probability varies over time and across physiochemical and disturbance gradients in a turbid lowland river, we tagged between 68 and 95 fish·year-1 with radio transmitters and up to 424 fish·year-1 with external and passive integrated transponder (PIT) tags. We surveyed the site noninvasively using radiotelemetry to determine which of the radio-tagged fish were present (effectively closing the radio-tagged population to emigration) and then electrofished to estimate the proportion of available fish that were captured based on both this and standard mark-recapture methods. We replicated the electrofishing surveys three times over a minimum of 12 days each year, for 7 years. Electrofishing capture probability varied between 0.020 and 0.310 over the 7 years and between four different large-bodied species (Murray cod (Maccullochella peelii), trout cod (Maccullochella macquariensis), golden perch (Macquaria ambigua ambigua), and silver perch (Bidyanus bidyanus)). River turbidity associated with increased river discharge negatively influenced capture probability. Increasing fish length increased detection of fish up to 500 mm for Murray cod, after which capture probability decreased. Variation in capture probability in large lowland rivers results in additional uncertainty when estimating population size or relative abundance. Research and monitoring programs using fish as an indicator should incorporate strategies to lessen potential error that might result from changes in capture probabilities.

UR - http://www.scopus.com/inward/record.url?scp=84901466287&partnerID=8YFLogxK

U2 - 10.1139/cjfas-2013-0287

DO - 10.1139/cjfas-2013-0287

M3 - Article

VL - 71

SP - 878

EP - 886

JO - J. FISH. RES. BOARD CANADA

JF - J. FISH. RES. BOARD CANADA

SN - 0706-652X

IS - 6

ER -