Using the Judas technique to locate and remove wintertime aggregations of invasive common carp

Bajer, Przemyslaw G.; Chizinski, Christopher J.; Sorensen, Peter W.

doi:10.1111/j.1365-2400.2011.00805.x

Cited by 115 publications

(115 citation statements)

References 23 publications

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“…Precise population estimates of adult carp were available for ten of the study lakes from ongoing mark-recapture studies (Bajer and Sorensen 2010;Bajer et al 2011;Osborne 2012; Table 1). In lakes for which mark-recapture data were not available, the abundance of carp was estimated using boat electrofishing in April-June and a regression relationship we developed using 4 years of census data [Density (carp/ha) = -0.48 ?…”

Section: Methodsmentioning

confidence: 99%

“…In the present study we employed a combination of correlative observations and controlled experiments to test the hypothesis that recruitment (and invasiveness) of the common carp can be explained by localized reductions in biotic resistance associated with seasonal declines in native micro-predators in unstable spawning habitat (Bajer and Sorensen 2010;Sorensen and Bajer 2011). We found strong evidence that native micro-predators and bluegill sunfish (Lepomis macrochirus) in particular, are able to control carp recruitment by exerting strong predatory pressure on carp eggs.…”

Section: Introductionmentioning

confidence: 96%

“…This species evolved in large and seasonally unstable rivers of Eastern Europe, is extremely fecund (up to 3 million eggs/female), and performs annual spawning migrations into peripheral floodplains and marshes (Balon 1995;Barus et al 2001). Over the course of the past century it has been introduced worldwide and reaches extreme densities in temperate regions of North and South America and south-central Australia (Sorensen and Bajer 2011) where it is also extremely damaging to ecosystems (Weber and Brown 2009). These regions are both large and characterized by seasonal environmental extremes that include winter and summer hypoxia and spring flooding (King et al 2003;Stuart and Jones 2006;Bajer and Sorensen 2010).…”

Section: Introductionmentioning

confidence: 99%

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Variation in native micro-predator abundance explains recruitment of a mobile invasive fish, the common carp, in a naturally unstable environment

et al. 2012

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Why certain species of fish become invasive is poorly understood and a key obstacle to restoring many of the world's ecosystems. In this study we tested whether variation in biotic resistance exerted by native predators might explain the reproductive success of the common carp, a large and fecund invasive species that typically spawns in outlying and unstable shallow habitat. An initial three-year study of the relative abundance of youngof-year (YOY) carp in interconnected lakes in the Upper Mississippi River Basin discovered that YOY carp are only found in shallow waters that experience winter hypoxia (winterkill) and have low densities of the native egg-predators that otherwise dominate these locales. A follow-up experiment tested if native fish predation on carp eggs could explain this distribution. It found that while carp eggs survived in winterkill lakes, they only survived in non-winterkill lakes when protected by a mesh that excluded fish. Large numbers of carp eggs were found in the stomachs of native fish inhabiting lakes that did not winterkill. We conclude that common carp, and likely many other highly mobile and fecund invasive fish, have evolved life histories to avoid egg predators and can become invasive when they are absent.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Variation in native micro-predator abundance explains recruitment of a mobile invasive fish, the common carp, in a naturally unstable environment

et al. 2012

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“…Commercial fisheries can cause nontarget impacts (e.g., bycatch); however, bycatch can be minimized by imposing size restrictions on fishing gear and identifying periods and locations of common carp aggregations (e.g., Diggle et al 2004;Penne and Pierce 2008;Bajer et al 2011). Additionally, harvest subsidies can replace market incentives to increase commercial harvest.…”

mentioning

confidence: 99%

Strategies to Control a Common Carp Population by Pulsed Commercial Harvest

Colvin

Pierce

Stewart

et al. 2012

N American J Fish Manag

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Commercial fisheries are commonly used to manage nuisance fishes in freshwater systems, but such efforts are often unsuccessful. Strategies for successfully controlling a nuisance population of common carpCyprinus carpio by pulsed commercial harvest were evaluated with a combination of (1) field sampling, (2) population estimation and CPUE indexing, and (3) simulation using an exponential semidiscrete biomass dynamics model (SDBDM). The range of annual fishing mortalities (F) that resulted in successful control (F= 0.244-0.265) was narrow. Common carp biomass dynamics were sensitive to unintentional underharvest due to high rates of surplus production and a biomass doubling time of 2.7 years. Simulations indicated that biomanipulation never achieved successful control unless supplemental fishing mortality was imposed. Harvest of a majority of annual production was required to achieve successful control, as indicated by the ecotrophic coefficient (EC). Readily available biomass data and tools such as SDBDMs and ECs can be used in an adaptive management framework to successfully control common carp and other nuisance fishes by pulsed commercial fishing. RightsWorks produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted. AbstractCommercial fisheries are commonly used to manage nuisance fishes in freshwater systems, but such efforts are often unsuccessful. Strategies for successfully controlling a nuisance population of common carp Cyprinus carpio by pulsed commercial harvest were evaluated with a combination of (1) field sampling, (2) population estimation and CPUE indexing, and (3) simulation using an exponential semidiscrete biomass dynamics model (SDBDM). The range of annual fishing mortalities (F) that resulted in successful control (F = 0.244-0.265) was narrow. Common carp biomass dynamics were sensitive to unintentional underharvest due to high rates of surplus production and a biomass doubling time of 2.7 years. Simulations indicated that biomanipulation never achieved successful control unless supplemental fishing mortality was imposed. Harvest of a majority of annual production was required to achieve successful control, as indicated by the ecotrophic coefficient (EC). Readily available biomass data and tools such as SDBDMs and ECs can be used in an adaptive management framework to successfully control common carp and other nuisance fishes by pulsed commercial fishing.

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“…We tagged 30 adult Carp (12 males and 18 females). A previous study showed that this approach (“Judas fish”) can be used to accurately describe overall Carp distribution and abundance (Bajer, Chizinski, & Sorensen, 2011). We re‐located these Carp 3 weeks later from a small boat using radio‐telemetry (manual bi‐angulation, a technique with an accuracy of about 20 m; Bajer & Sorensen, 2010) to confirm their health (all survived) and to pick a site that lacked Carp that could be used as a bait site.…”

Section: Methodsmentioning

confidence: 99%

Attracting Common Carp to a bait site with food reveals strong positive relationships between fish density, feeding activity, environmental DNA, and sex pheromone release that could be used in invasive fish management

Ghosal

Eichmiller

Witthuhn

et al. 2018

Ecology and Evolution

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Measurement of environmental DNA (eDNA) is becoming a common technique to survey for rare and invasive fish due to its sensitivity and specificity. However, its utility is limited by an incomplete understanding of factors governing its sources and fates. Failure to detect eDNA is especially difficult to interpret so surveillance techniques often collect large numbers of samples across broad regions. If, however, fish could be reliably attracted to a single location where their eDNA could be easily measured that would be useful. We conducted a proof‐of‐concept study of this idea using invasive Common Carp. We monitored the distribution of radio‐tagged Carp and their eDNA across a 67 ha lake focusing at the bait site while a pheromone (Prostaglandin F2α; PGF 2α) was also measured to determine their reproductive condition. Prior to baiting, Carp were patchily distributed and while eDNA was occasionally detectable, it was patchy and only loosely associated with moderately dense groups of fish. Further, neither Carp, nor their eDNA were consistently measurable at the bait site and surrounding region, and the pheromone was not measurable at all. However, once baiting commenced, Carp started visiting the bait site and feeding, especially at night, where eDNA levels increased 500‐fold as fish densities doubled and PGF 2α became detectable. Fish presence, eDNA and pheromone concentrations peaked at night after 6 days, strongly suggesting feeding activity was the main driver. While the presence of eDNA precisely coincided with this aggregation, levels had dropped dramatically within 5 m. PGF 2α levels dropped less rapidly and demonstrated the presence of live mature fish. We suggest that food could be used to train fish to come to locations where they otherwise are too scarce to be reliably measured, increasing their eDNA release, making them measurable, and their reproductive condition also discernable by measuring pheromones.

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Using the Judas technique to locate and remove wintertime aggregations of invasive common carp

Cited by 115 publications

References 23 publications

Variation in native micro-predator abundance explains recruitment of a mobile invasive fish, the common carp, in a naturally unstable environment

Variation in native micro-predator abundance explains recruitment of a mobile invasive fish, the common carp, in a naturally unstable environment

Strategies to Control a Common Carp Population by Pulsed Commercial Harvest

Attracting Common Carp to a bait site with food reveals strong positive relationships between fish density, feeding activity, environmental DNA, and sex pheromone release that could be used in invasive fish management

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