Helminth Parasites of Alaskan Muskrats

Dunagan, T. T.

doi:10.2307/3223897

Cited by 2 publications

(3 citation statements)

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“…Hysterothylacium sp. has been found in 19 fish species from Alaskan coastal waters [19][20][21][22][23][24][25][26][27][28][29]. Clearly, these parasitic nematodes are common in many species of host fish in this area; however, quantitative studies, such as ours, are lacking [1].…”

Section: Discussionmentioning

confidence: 95%

“…All three species of parasitic nematodes that we observed in our study have previously been documented in multiple species of host fish in Alaskan waters. Anisakis simplex has been documented in G. chalcogrammus and in at least four other fish species in Alaskan coastal waters [19][20][21][22][23][24][25][26][27][28][29]. Pseudoterranova decipiens has been documented in nine species of fish in Alaskan waters [19][20][21][22][23][24][25][26][27][28][29].…”

Section: Discussionmentioning

confidence: 99%

“…Anisakis simplex has been documented in G. chalcogrammus and in at least four other fish species in Alaskan coastal waters [19][20][21][22][23][24][25][26][27][28][29]. Pseudoterranova decipiens has been documented in nine species of fish in Alaskan waters [19][20][21][22][23][24][25][26][27][28][29]. Hysterothylacium sp.…”

Section: Discussionmentioning

confidence: 99%

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Nematode Parasites of Rockfish (Sebastes spp.) and Cod (Gadus spp.) from Waters near Kodiak Island Alaska, USA

et al. 2021

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Distribution and abundance of common parasitic nematodes in marine fishes is not well documented in many geographic regions. Understanding the influence of large-scale environmental changes on infection rates of fish by nematodes requires quantitative assessments of parasite abundance for multiple host species. We collected samples of two species of cod and eight species of rockfish (total of 232 specimens) from waters near Kodiak Island, Alaska, USA during Spring and Summer of 2015, and dissected and recorded all internal nematode parasites. We quantified the prevalence and intensity of nematode parasites in the ten host species, and tested for differences in prevalence among host species. We found three species of nematode: Anisakis simplex, sensu lato (Van Thiel), Pseudoterranova decipiens, sensu lato (Krabbe), and Hysterothylacium sp. (Ward and Magath). Eighty-two percent of the examined fish were infected with at least one parasitic nematode. The overall prevalence of P. decipiens, A. simplex, and Hysterothylacium sp. was 56%, 62%, and 2%, respectively. Anisakis simplex and P. decipiens were abundant and present in all ten species of host fish examined, whereas Hysterothylacium sp. was rare and found in only five of the host fish species. Prevalence and mean intensity of P. decipiens and A. simplex varied across the ten host species, and the number of parasites varied substantially among individual hosts within host species. The mean intensity of P. terranova and A. simplex in our study was substantially higher than the mean intensity for these same species from multiple other locations in a recent meta-analysis. This study provides a baseline of nematode parasite abundance in long-lived fish in waters near Kodiak Island, AK, and fills an important gap in our quantitative understanding of patterns of occurrence and abundance of these common and widespread parasites of marine fish.

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