Comparison of point and transect-based electrofishing to sample American eel (<i>Anguilla rostrata</i>) in wadeable riverine habitats

Reid, Scott M.

doi:10.1051/alr/2011106

Cited by 11 publications

(10 citation statements)

References 24 publications

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“…Eel may, for instance, be immobilized due to their length over the voltage gradient, reducing catchability (Zalewski and Cowx 1989), and stunned eel may be difficult to detect in water with low visibility (Koops 1980). However, data presented by Baldwin and Aprahamian (2012) showed relatively high ([ 0.6) catch efficiency of eel after one electrofishing run, indicating that eel occurrence and abundance may not be as difficult to estimate as commonly regarded (Reid 2011;Acou et al 2011).…”

Section: Introductionmentioning

confidence: 91%

“…Electrofishing is often carried out in wadeable small-to medium-sized running waters to monitor salmonid recruitment. Baldwin and Aprahamian (2012) stated that surveys focusing on salmonids also can potentially give good estimates of eel abundance, and Reid (2011) showed that transect-based sampling is better than point-based sampling of eel occurrence and abundance. However, it has also been argued that data on eel from such programmes are inadequate, with low precision in abundance estimates (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Occurrence and habitat use of European eel (Anguilla anguilla) in running waters: lessons for improved monitoring, habitat restoration and stocking

et al. 2019

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To improve the management of the European eel (Anguilla anguilla) in freshwater, it is essential to define important lotic habitats. Electrofishing data from 289 wadeable, hard-bottom sites in 69 Swedish coastal rivers and streams, originally surveyed for salmonid monitoring, were used to evaluate the effects of sampling-and habitat-related factors on eel occurrence. Probability of eel occurrence, as influenced by sampling procedure (sampled area, number of consecutive runs and ambient water temperature) and habitat characteristics (size of catchment, dominating bottom substrate, shade, water velocity, mean depth), was evaluated for small (total length B 150 mm) and large ([ 150 mm) yellow eels. Data were analysed in a mixed presence/absence generalized linear model with dispersal (distance to mouth from sampled site), habitat and samplingrelated variables as covariates. The two models explained variation in occurrence to 81.5% for small eel and 76.2% for large eel. Probability of eel occurrence decreased with distance from the river mouth, and increased with sampled area, number of runs, water temperature, coarser substrate and size of river. We suggest that future eel habitat restoration should focus on lower reaches of larger rivers with suitable coarse bottom habitats. Stocking of young eel should be carried out in comparable accessible habitats in the upper reaches where eel densities are low. The results also strongly indicate that eel may be sampled together with young salmonids with DC electrofishing in wadeable habitats.

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Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Occurrence and habitat use of European eel (Anguilla anguilla) in running waters: lessons for improved monitoring, habitat restoration and stocking

et al. 2019

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“…Small water bodies were fished completely, while larger ones were strip-sampled with comparable effort. EF was always performed by wading [30][31][32][33]. The sampling area of Kougri is located on the Nakanbé River to the east of Ouagadougou.…”

Section: Fish Sampling and Fish Determinationmentioning

confidence: 99%

Fish Communities, Habitat Use, and Human Pressures in the Upper Volta Basin, Burkina Faso, West Africa

et al. 2019

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Human pressures and loss of natural fish habitats led to a decline in fish populations in terms of abundances, biodiversity, and average size in sub-Sahelian Burkina Faso. Little knowledge exists about fish assemblages regarding their composition, their habitat preferences, or their sensitivity to or tolerance of human pressures. This research provides the first data-driven basis for sustainably managing fish and associated aquatic and terrestrial habitats. Surveys in four different regions sampled 18,000 specimens from 69 species during the dry season. Fish communities, available abiotic habitat conditions, habitat use, and human pressures were assessed and analyzed. Fish communities cluster into four distinct types, each dominated by either Cichlidae, Clariidae, Cyprinidae, or Alestidae and accompanied by specific other families and genera of fish. Habitat preferences of four key species (Labeo coubie, Bagrus bajad, Chelaethiops bibie, and Lates niloticus) were linked to ecological habitat conditions. Results show that physical parameters influence fish community composition and abundances and, when indexed according to pressure type, are linked to responses in fish metrics. Relative abundance either dropped (Mormyridae) or increased (Cichlidae, Cyprinidae) with rising pressure intensity, and some sentinel taxa (Auchenoglanis, Hydrocynus) were only found in low-pressure sites. The outcomes of this study provide basic knowledge of habitat availability, habitat use by fish, species associations, and human pressures and therefore provide the basis for effective conservation and management of fish populations.

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“…Given the financial and human resources required, these surveys need to provide accurate and precise results and employ efficient sampling designs. To improve the design of electro fishing‐based inventories and monitoring, past research has addressed a diverse range of considerations including choice of sampling unit (Reid, ), sampling intensity (Stanfield, Lester, & Petreman, ), sampling effort (Jones & Stockwell, ; Tomanova, Tedesco, Roset, Berrebi Dit Thomas, & Belliard, ), number of electrofishing units (Kimmel & Argent, ), area of habitat sampled (Angermeier & Smogor, ; Simon & Morris, ), number of sampling sites (Smith & Jones, , ), and selection of sampling locations (Quist, Gerow, Bower, & Hubert, ).…”

Section: Introductionmentioning

confidence: 99%

“…Thebackpackelectrofisherisacommonlyusedgeartosamplefishes from wadeable stream and river habitats (Rabeni, Lyons, Mercado-Silva,&Peterson,2009;Snyder,2003).Electrofishingsurveydataare used to assess biological integrity, monitor fish species that are of concerntomanagementorconservation,delineateareasofprotected habitat, assess the impacts of human activities, and describe the spatial-temporalpatternsofspeciesdiversityandcommunitycompositioninrelationtoenvironmentalfactors(e.g. Cao,Larsen,&Hughes, 2001;Reid&Hogg,2014).Giventhefinancialandhumanresources required,thesesurveysneedtoprovideaccurateandpreciseresults andemployefficientsamplingdesigns.Toimprovethedesignofelectro fishing-based inventories and monitoring, past research has addressedadiverserangeofconsiderationsincludingchoiceofsampling unit (Reid, 2011), sampling intensity (Stanfield, Lester, & Petreman, 2013),samplingeffort (Jones&Stockwell,1995;Tomanova,Tedesco, Roset,BerrebiDitThomas,&Belliard,2013),numberofelectrofishing units (Kimmel&Argent,2006),areaofhabitatsampled (Angermeier & Smogor, 1995;Simon & Morris, 2014), number of sampling sites (Smith & Jones, 2005, and selection of sampling locations (Quist,Gerow,Bower,&Hubert,2006).…”

Section: Introductionmentioning

confidence: 99%

Backpack electrofishing effort and imperfect detection: Influence on riverine fish inventories and monitoring

Reid

Haxton

2017

J Appl Ichthyol

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Summary An increased electrofishing sampling effort will increase detection probabilities of riverine fishes. In this study, a repeat‐sampling approach was used in small to medium‐sized Ontario (Canada) rivers to estimate: (i) species‐specific detection probabilities of freshwater fishes, (ii) the number of sampling events required to confidently detect species, and (iii) the power of timed‐search surveys to detect future distribution (or occupancy) declines. Wadeable habitats at 36 sites were sampled with a backpack electrofisher on four separate dates during the summer low‐flow period in 2013 and 2014. Forty‐two species were collected, including three species of conservation concern (American eel Anguilla rostrata Lacépède, 1802, channel darter Percina copelandi Jordan, 1877, northern sunfish Lepomis peltastes Cope, 1870), and two recreationally important species (largemouth bass Micropterus salmoides Lacépède, 1802 and smallmouth bass Micropterus dolomieu Lacépède, 1802). A hierarchical Bayesian modelling approach was used to estimate detection probabilities and site occupancy for 18 species at four levels of effort: 250, 500, 750 and 1,000 s. In all cases, species detection was imperfect. Search effort had a positive effect on estimates of detection probability and site occupancy and the power to detect declines in future distribution. Detection probabilities ranged from 0.11 to 0.66 with an effort of 250 s, and 0.27 to 0.92 with an effort of 1,000 s. For 13 species, detection and power to detect changes in distribution were significantly improved by increasing sampling effort from 250 to 750 s or 1,000 s. For the channel darter and northern sunfish, three replicate sampling visits (of 750 or 1,000 s duration) are recommended for confident detection.

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Comparison of point and transect-based electrofishing to sample American eel (Anguilla rostrata) in wadeable riverine habitats

Cited by 11 publications

References 24 publications

Occurrence and habitat use of European eel (Anguilla anguilla) in running waters: lessons for improved monitoring, habitat restoration and stocking

Occurrence and habitat use of European eel (Anguilla anguilla) in running waters: lessons for improved monitoring, habitat restoration and stocking

Fish Communities, Habitat Use, and Human Pressures in the Upper Volta Basin, Burkina Faso, West Africa

Backpack electrofishing effort and imperfect detection: Influence on riverine fish inventories and monitoring

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