Prevalence and intensity of the parasitic copepod (<i>Salmincola californiensis</i>) on Kokanee salmon (<i>Oncorhynchus nerka</i>) in a reservoir in Colorado

Hargis, Lauren N.; Lepak, Jesse M.; Vigil, Estevan M.; Gunn, Carolyn

doi:10.1894/n06-jc-72.1

Cited by 18 publications

(36 citation statements)

References 15 publications

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“…), emerging parasite–host dynamics involving Salmincola (Hargis et al. ), recreational harvest dynamics (Askey and Johnston ), and predicting spawner escapement for informing wild‐spawn and hatchery operations (Baldwin and McLellan ) require minimally biased information on size and age structure. Although retention models alone likely do not account for all processes influencing the size selectivity of experimental gill nets, they remove some bias and strengthen evaluations like those listed above.…”

Section: Discussionmentioning

confidence: 99%

Size‐Dependent Retention of Pelagic‐Oriented Kokanee in Multimesh Gill Nets

Hansen

2019

N American J Fish Manag

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Recent studies evaluating the size selectivity of standard, horizontal, benthic gill nets for some common sport fish have demonstrated congruence across regions and gear configurations. Studies evaluating retention in gill nets designed to sample pelagic‐oriented fish (e.g., vertical and curtain nets) are rare, which has limited corresponding assessments of generality. This study estimated the retention of kokanee Oncorhynchus nerka (lacustrine Sockeye Salmon) in multimesh vertical gill nets using catch data compiled over three decades from a large montane reservoir in Colorado. The corresponding best‐fit retention model was compared with that developed for kokanee in Idaho using multimesh curtain nets. There was strong congruence (Pearson's r = 0.98) between the total retention values (integrated over all mesh sizes) estimated by the two models for kokanee 50–430 mm total length, and the values followed a 1:1 relationship. This result indicated that the retention of fish in pelagic gill nets may also be largely conserved across regions and gear configurations. Thus, the retention models for kokanee compared in this study should be flexible and broadly applicable. These properties enable practitioners to easily adjust length‐frequency distributions for bias arising from size‐dependent retention when minimally biased estimates of size structure are needed for addressing management or research questions.

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Section: Discussionmentioning

confidence: 99%

Size‐Dependent Retention of Pelagic‐Oriented Kokanee in Multimesh Gill Nets

Hansen

2019

N American J Fish Manag

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“…; Hargis et al . ). Gill lice have been associated with deleterious effects on salmonids including growth inhibition, decreased fecundity, limiting oxygen uptake, delaying sexual maturation, lowering resistance to high temperatures and increasing mortality (Gall, Mcclendon & Schafer ; Chigbu ; Gunn et al .…”

Section: Introductionmentioning

confidence: 99%

“…; Hargis et al . ). Improved understanding of this species' life history may provide insight into managing popular sport fish and native salmonids in the presence of gill lice.…”

Section: Introductionmentioning

confidence: 99%

“…are parasitic copepods that commonly infect salmonids (Kabata 1969;Conley & Curtis 1993). Gill lice mainly attach on the gills of infected fish; however, they are also found on fins, opercula and the mouth cavity (Kabata & Cousens 1977;Gunn et al 2012;Hargis et al 2014). Gill lice have been associated with deleterious effects on salmonids including growth inhibition, decreased fecundity, limiting oxygen uptake, delaying sexual maturation, lowering resistance to high temperatures and increasing mortality (Gall, Mcclendon & Schafer 1972;Chigbu 2001;Gunn et al 2012).…”

Section: Introductionmentioning

confidence: 99%

“…A host of S. californiensis, rainbow trout Oncorhynchus mykiss (Walbaum 1792), is arguably one of the most widely stocked sport fish in the world, historically stocked in over 80 countries on six continents (Halverson 2010), and gill lice have been spread through stocking, moving water and other anthropogenic activities associated with fish introductions (Sutherland & Whittrock 1985). The negative effects of S. californiensis threaten native fish and hatchery stocks of fish (Modin & Veek 2011;Gunn et al 2012;Hargis et al 2014). Improved understanding of this species' life history may provide insight into managing popular sport fish and native salmonids in the presence of gill lice.…”

Section: Introductionmentioning

confidence: 99%

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Temperature effects on hatching and viability of Juvenile Gill Lice,Salmincola californiensis

Vigil

Christianson

Lepak

et al. 2015

Journal of Fish Diseases

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Salmonids of the genus Oncorhynchus, distributed throughout the Pacific Rim, can be infected by the gill lice species Salmincola californiensis (Dana, 1852), which makes them one of the most broadly distributed gill lice species. Despite their broad distribution and valuable obligate salmonid hosts, relatively little is known about S. californiensis. We evaluated effects of temperature on timing of S. californiensis hatching and survival of copepodids, and provide information on brood size and variability. Our results suggest that temperature was a primary driver of timing of S. californiensis hatching and post-hatching survival. Prior to this study, the free-swimming stage of S. californiensis was reported to survive approximately 2 days without a suitable host. We observed active copepodids 13 days after hatch with some individuals from most (>90%) viable egg sacs at all temperature treatments surviving ≥5 days. Our findings indicate that warmer temperatures could increase development rates of gill lice at certain life stages, potentially increasing fecundity. This information coupled with predictions that warmer water temperatures could intensify crowding of coldwater fishes, stress, and parasite transmission suggests that climate change could exacerbate negative effects of S. californiensis on ecologically and economically important salmonids.

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Prevalence and Intensity of Salmincola edwardsii in Brook Trout in Northwest New Brunswick, Canada

et al. 2020

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Parasites can compromise the health and fitness of individual fish, and it is important to generate baseline information that can then be used to document changes in the abundance and distribution of potentially pathogenic parasites. The ectoparasitic copepod Salmincola edwardsii was assessed with respect to prevalence (percentage of infected fish per site), infection intensity (number of parasites per infected fish), and attachment location on Brook Trout Salvelinus fontinalis in northwest New Brunswick, Canada. Ten sample sites were assessed, with six sites on two streams in the Quisibis River basin and four sites on three streams in the Restigouche River basin. Parasite species identity was supported by 100% sequence identity with S. edwardsii in a variable region within 28S rDNA. The prevalence of fish infected per site ranged from 19.0% to 79.6%, with an overall prevalence of 48.5 ± 19.1% (mean ± SD) per site. Mean infection intensity was 1.5 ± 0.9 copepods/fish (range = 1–7), with parasites almost exclusively surrounding the dorsal fin and/or adipose fin (97.6%). There was no influence of trout age‐class on parasite prevalence. Some fish presented with fin erosion at the site of parasite attachment (12.5%), and 6.2% also presented with hyperplastic skin lesions where no parasites were observed, that could be misinterpreted as secondary bacterial or fungal infections. Skin and fin damage were significantly more common when fish were infected with three or more individual parasites. The pathogenic potential of this parasite makes its presence noteworthy as a risk to salmonids that are both recreationally and ecologically important.

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Prevalence and intensity of the parasitic copepod (Salmincola californiensis) on Kokanee salmon (Oncorhynchus nerka) in a reservoir in Colorado

Cited by 18 publications

References 15 publications

Size‐Dependent Retention of Pelagic‐Oriented Kokanee in Multimesh Gill Nets

Size‐Dependent Retention of Pelagic‐Oriented Kokanee in Multimesh Gill Nets

Temperature effects on hatching and viability of Juvenile Gill Lice,Salmincola californiensis

Prevalence and Intensity of Salmincola edwardsii in Brook Trout in Northwest New Brunswick, Canada

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