Macroparasites of epipelagic and eurybathic fishes in the north-western Pacific

Гордеев, И. И.; Соколов, С. Г.

doi:10.15298/invertzool.17.2.02

Cited by 7 publications

(13 citation statements)

References 6 publications

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“…Tables 1, 2). The absence of Brachyphallus crenatus (Rudolphi, 1802) in the guts of chum and pink salmon in our previous parasitological study in the open water of north-western Pacific (Gordeev, Sokolov, 2020b) was strikingly different from the data collected by Mamaev et al (1959), who showed a heavy infection with this parasite (up to 750 worms per fish). In our research B. crenatus was present in the stomachs of both salmon species, but the value of infection never exceeded five worms per fish further investigation.…”

Section: Discussioncontrasting

confidence: 88%

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Helminths of epipelagic fish in the western Bering Sea and southern Sea of Okhotsk

Gordeev,

Sokolov

2023

Invertzool

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During the parasitological survey on the research vessel Professor Kaganovsky, the western part of the Bering Sea and the southern part of the Sea of Okhotsk was investigated for fish infection by parasites. In total, 1083 specimens of 17 species of teleosts and salmon shark Lamna ditropis were dissected, in which 32 species of parasites were found. The plerocercoids Pelichnibothrium speciosum s. lato prevailed in the Bering Sea. In the Sea of Okhotsk, the maximum intensity and prevalence of infection were noted for P. specioum s. lato, Anisakis sp. and Echinorhynchus gadi s. lato. The difference in the number of studied fish species in the Bering and Okhotsk Seas (14 vs 9) significantly affected the species diversity of noted parasites (28 vs 18). Teleosts caught in the coastal area and the ones performing vertical migrations to some degree differed in terms of infection pattern, primarily due to digeneans component. Macroparasites of the crested sculpin Blepsias bilobus were studied for the first time, and 20 new records were made on the infection of previously studied fish species. Parasite fauna of fish in the epipelagic zone of the western part of the Bering Sea and the southern part of the Sea of Okhotsk is characterized by significant intensity, however, relatively poor species diversity.

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Section: Discussioncontrasting

confidence: 88%

“…Tables 1, 2). This observation indirectly confirms our earlier ideas about the presence of waves of infection with B. crenatus (Gordeev, Sokolov, 2020b). We dissected only four individuals of O. keta from the Bering Sea, which is not enough for any conclusions.…”

Section: Methodssupporting

confidence: 88%

Helminths of epipelagic fish in the western Bering Sea and southern Sea of Okhotsk

Gordeev,

Sokolov

2023

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“…The F abs of the Fedorov's lumpsucker in our study was significantly lower than that reported for other species of Cyclopteridae. For example, in another study, fecundity of lumpfish ranged from 50,000 to 159,000 eggs (Gregory and Daborn, 1982). The values of F abs of Atlantic spiny lumpsucker and smooth lumpsucker have been reported to be more than 1000 eggs (Dolgov 2 ; Hutchings 3 ) and between 24,240 and 63,756 eggs (Zhukova et al, 2018), respectively.…”

Section: Discussionmentioning

confidence: 93%

The first data on the diet and reproduction of Fedorov's lumpsucker (Eumicrotremus fedorovi)

Гордеев¹,

Жукова²,

Frenkel³

2021

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A total of 69 specimens of Fedorov's lumpsucker (Eumicrotremus fedorovi) caught on the continental shelf and slope of Simushir Island in the northwest Pacific Ocean were dissected and studied for stomach contents. The Fedorov's lumpsucker was found to feed mainly on the young of fish species, including the walleye pollock (Gadus chalcogrammus), northern lampfish (Stenobrachius leucopsarus), and northern smoothtongue (Leuroglossus schmidti), crustaceans, such as Themisto pacifica, Primno macropa, calanoids, gammarids, mysids, and caprellids, and squid. Histological analyses of ovaries revealed iteroparity, determinate fecundity, group-synchronous ovarian development, and total spawning. Testes were of an unrestricted lobular type. Chorion and thick zona radiata of Fedorov's lumpsucker correspond to the condition of eggs in specimens of other fish species that release demersal eggs. Absolute fecundity values of Fedorov's lumpsucker in our study were significantly less than those that have been reported for other species of Cyclopteridae. The results of this study provide the first data on this little known species of this family.

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“…Sebastes ruberrimus exhibits very low infection rates of P. decipiens, and except for one highly infected individual, low infection rates by A. simplex. It may be that parasite abundance or diversity in fish may be higher at shallower depths [30]. The pelagic-feeding rockfish can be divided into two groups based on the average depth they occupy.…”

Section: Discussionmentioning

confidence: 99%

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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Macroparasites of epipelagic and eurybathic fishes in the north-western Pacific

Cited by 7 publications

References 6 publications

Helminths of epipelagic fish in the western Bering Sea and southern Sea of Okhotsk

Helminths of epipelagic fish in the western Bering Sea and southern Sea of Okhotsk

The first data on the diet and reproduction of Fedorov's lumpsucker (Eumicrotremus fedorovi)

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

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