Predictors of bigheaded carp drifting egg density and spawning activity in an invaded, free-flowing river

Coulter, Alison A.; Keller, Doug; Bailey, Elizabeth J.; Goforth, Reuben R.

doi:10.1016/j.jglr.2015.10.009

Cited by 33 publications

(52 citation statements)

References 43 publications

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“…Discharge has long been regarded as an important trigger of spawning in bigheaded carp species because it distributes their negatively buoyant eggs (Abdusamadov 1987;Schrank et al 2001;Deters et al 2013). In the absence of flow, the eggs may settle and fail to hatch (Garcia et al 2013), although there is evidence that flow is not the only factor affecting spawning (Coulter et al 2013(Coulter et al , 2016. The adults' spawning response to FIGURE 5.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal Reproduction and Larval Habitat Associations of Nonnative Silver Carp and Bighead Carp

et al. 2017

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The establishment of nonnative Silver Carp Hypophthalmichthys molitrix and Bighead Carp H. nobilis (collectively referred to as "bigheaded carp") in the central United States may have negative ecological consequences and economic impacts. Our objectives were to quantify patterns and habitat associations of adult bigheaded carp reproduction, larval production, and habitat use; such information is important for control strategies and identifying recruitment sources. During May-August 2011, we sampled adults and larvae at 10 sites distributed adjacent to and within the main channel of the Mississippi River at Pool 26 (study area = 28 river kilometers). Female reproductive status, adult location, and larval density were compared to environmental conditions, including temperature, site velocity, and turbidity. Large females spawned earlier than their smaller counterparts. No clear spawning aggregations of adults were observed, suggesting plasticity in staging habitat. Larvae were distributed across all sites during flooding. Larval density was positively related to velocity and turbidity, suggesting that nondepositional areas may facilitate recruitment. Bigheaded carp larvae comprised 10% of the ichthyofauna. Although pooled reaches are a source of recruitment for bigheaded carp in the Mississippi River system, the low densities of bigheaded carp larvae relative to native larvae cannot explain the dominance of adults in this system. Our findings provide insights into the plastic nature of bigheaded carp reproduction and habitats associated with larval development. Control efforts that target large adult females should be conducted earlier during the spring spawn. To maintain fishing pressure, such control efforts would likely need to continue through the summer, when smaller individuals spawn, discharge decreases, and CPUE increases. However, we found no specific mass staging area or habitat type where adult females could be targeted.

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Section: Discussionmentioning

confidence: 99%

Spatiotemporal Reproduction and Larval Habitat Associations of Nonnative Silver Carp and Bighead Carp

et al. 2017

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“…First introduced in the 1960s, Grass Carp (Ctenopharyngodon idella), Silver Carp (Hypophthalmichthys molitrix), and Bighead Carp (H. nobilis), collectively called invasive carp hereafter, have invaded the Mississippi River basin and are expanding their range, threatening ecosystem integrity (Freeze and Henderson 1982;Wittmann et al 2014). Efforts to determine areas of current and potential establishment have largely relied upon the detection of early life stages (Deters et al 2013;Coulter et al 2016;Embke et al 2016). However, discrepancies and lack of information describing morphological egg characteristics of invasive carp and native North American species has made visual identification of fish eggs difficult and unreliable (Richards 1985;Larson et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Morphological Identification of Bighead Carp, Silver Carp, and Grass Carp Eggs Using Random Forests Machine Learning Classification

Camacho

Sullivan

Weber

et al. 2019

N American J Fish Manag

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Visual identification of fish eggs is difficult and unreliable due to a lack of information on morphological egg characteristics of many species. We used random forests machine learning to predict the identity of genetically identified Bighead Carp (Hypophthalmichthys nobilis), Grass Carp (Ctenopharyngodon idella), and Silver Carp (H. molitrix) eggs based on egg morphometric and environmental characteristics. Family, genus, and species taxonomic level random forests were explored to assess variable performance and accuracy. Bighead Carp, Grass Carp, and Silver Carp egg characteristics were similar and difficult to distinguish from one another. When combined into a single invasive carp class, random forests were ≥97% accurate at identifying invasive carp eggs with a ≤5% false positive rate. Egg membrane diameter was the most important predictive variable, but the addition of ten other variables resulted in a 98% success rate for identifying invasive carp eggs from 26 other upper Mississippi River basin species. Our results reveal that a combination of morphometric and environmental measurements can be used to identify invasive carp eggs. Similar machine learning approaches could be used to identify eggs of other fishes. These results will help managers more easily and quickly assess invasive carp reproduction. Disciplines Disciplines Aquaculture and Fisheries | Natural Resources Management and Policy | Statistical Models Comments Comments This is a manuscript of an article published as Camacho, Carlos A.,

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“…Behavioural differences among bigheaded carp hybrids and parental species could affect the establishment of these species in different habitats as well as their dispersal and range expansion. Movements and behaviours of bigheaded carps have commonly been related to water temperature, river discharge, and changes in temperature and discharge (Coulter, Bailey, Keller, & Goforth, , ; Coulter, Schultz, Tristano, Brey, & Garvey, ; DeGrandchamp, Garvey, & Colombo, ; Lubejko et al, ) with silver carp movements sometimes more strongly linked with river discharge whereas bighead carp movements were more strongly linked with water temperature (Coulter et al, ). Unfortunately, these studies only visually identified bighead carp and silver carp, so groupings were likely to contain a mixture of parental species and hybrid individuals that may have confounded results.…”

Section: Introductionmentioning

confidence: 99%

Early generation hybrids may drive range expansion of two invasive fishes

Coulter

Brey

Lamer³

et al. 2019

Freshwater Biology

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Introgressive hybridisation between two invasive species has the potential to contribute to their invasion success and provide genetic resiliency to rapidly adapt to new environments. Additionally, differences in the behaviour of hybrids may lead to deleterious ecosystem effects that compound any negative impacts of the invading parental species. Invasive silver carp (Hypophthalmichthys molitrix) and bighead carp (Hypophthalmichthys nobilis) provide an opportunity to evaluate how hybridisation may influence the behaviour, dispersal, and spread of an invasive species introgressive complex. In order to investigate the role hybrids may have in the invasion ecology of bigheaded carps, we examined the distribution, movements, and environmental cues for movement of two invasive fishes and their hybrids in the Illinois River (U.S.A.). Early generation hybrids (e.g. F1,F2, and first‐generation backcross individuals) composed a greater proportion of the population at the invasion front where abundances of bigheaded carp were low. A greater proportion of early hybrids passed through dams upstream towards the invasion front than did other hybrids and parental species. The movements and environmental cues for movement of late‐generation backcrosses (more genetically similar to parental genotype) were not different from the parental species with which they shared the most alleles. Although the direction of the relationship between movement and environment was sometimes different for the parental species and associated advanced generation hybrids, these results indicate that management for parental species will also affect most hybrids. Although early generation hybrids are rare, our results indicate they may disperse towards low‐density population zones (i.e. invasion fronts) or are produced at greater frequency in low‐density areas. These rare hybrids have the potential to produce a variety of unique genetic combinations that could result in more rapid adaptation of a non‐native population to their invaded range potentially facilitating the establishment of invasive species.

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Predictors of bigheaded carp drifting egg density and spawning activity in an invaded, free-flowing river

Cited by 33 publications

References 43 publications

Spatiotemporal Reproduction and Larval Habitat Associations of Nonnative Silver Carp and Bighead Carp

Spatiotemporal Reproduction and Larval Habitat Associations of Nonnative Silver Carp and Bighead Carp

Morphological Identification of Bighead Carp, Silver Carp, and Grass Carp Eggs Using Random Forests Machine Learning Classification

Early generation hybrids may drive range expansion of two invasive fishes

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