Parasites of herring ( Clupea harengus L.) larvae from a local Norwegian fjord stock

Tolonen, Arto; Karlsbakk, Egil

doi:10.1080/00364820308461

Cited by 2 publications

(3 citation statements)

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“…At the basis of our investigation was the hypothesis that herring larval overwintering survival could be regulated by parasite infection. The two types of parasites, tetraphyllidean cestode larvae and digenean trematodes, which were identified from herring larvae digestive tracts, have previously been reported from herring larvae in the Northeast Atlantic and the North Sea (Rosenthal, 1967;Heath and Nicoll, 1991;Karlsbakk et al, 2003;Tolonen and Karlsbakk, 2003). The prevalences and intensities we report are well within the range reported in these studies and the effects we describe here are therefore not the result of abnormally high or low levels of parasite prevalence or intensity.…”

Section: Discussionsupporting

confidence: 88%

North Sea herring (Clupea harengus L.) recruitment failure may be indicative of poor feeding success

Lusseau

Gallego

Rasmussen

et al. 2014

ICES Journal of Marine Science

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Recruitment of the 2002–2012 year classes to the North Sea herring stock has been below expectations given the spawning biomass, due to exceptionally low overwinter survival of larvae. Here, we investigate whether changes in survival of larvae in the northwestern North Sea could be attributed to changes in parasite prevalence or feeding conditions. We used a method that combined particle tracking models and survey data to estimate survival, and microscopic examination of gut contents of archived samples of larvae collected in February each year between 1995 and 2007 to investigate parasite prevalence and feeding. We deduced that we can use the incidence of tetraphyllidean parasites as an index of the cumulative feeding history of the larval population. We found that the prevalence of larvae of a tetraphyllidean cestode in the gut contents varied significantly between years and was positively correlated with feeding success. High feeding success, indicated by high prevalence of tetraphyllideans, influenced survival by offsetting the effect of a second parasite type, a digenean trematode. We suggest that variability in cumulative food intake over the lifespan up to February is a significant determinant of variability in survival.

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Section: Discussionsupporting

confidence: 88%

North Sea herring (Clupea harengus L.) recruitment failure may be indicative of poor feeding success

Lusseau

Gallego

Rasmussen

et al. 2014

ICES Journal of Marine Science

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“…This latter evidence, though less definitive and preliminary, is important. Sea lice on juvenile herring are unreported for the Pacific and extremely rare in the Atlantic (Tolonen and Karlsbakk 2003). The herring were young of the year, translucent, and lacked scales, suggesting high vulnerability to mechanical damage of surface tissues caused by sea lice.…”

Section: Discussionmentioning

confidence: 99%

“…In addition, this region may be important early juvenile rearing habitat for Pacific herring Clupea pallasii in the Strait of Georgia, British Columbia's largest herring stock. Sea lice have not been found juvenile Pacific herring and are extremely in the Atlantic herring C. harengus (Tolonen and Karlsbakk 2003). We therefore examined wild juvenile pink, chum, and sockeye salmon and juvenile Pacific herring in the Discovery Islands region for sea lice in relation to proximity to salmon farms.…”

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confidence: 99%

Sea Louse Infestation in Wild Juvenile Salmon and Pacific Herring Associated with Fish Farms off the East‐Central Coast of Vancouver Island, British Columbia

Morton

Routledge

Krkošek

2008

N American J Fish Manag

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Reports of infestations of sea lice Lepeophtheirus salmonis and Caligus clemensi in juvenile salmonids in Pacific Canada have been restricted to pink salmon Oncorhynchus gorbuscha and chum salmon O. keta from one salmon-farming region, the Broughton Archipelago of British Columbia. Here, we report on 2 years of sea louse field surveys of wild juvenile pink and chum salmon, as well as wild sockeye salmon O. nerka and larval Pacific herring Clupea pallasii, in another salmon farming region, the Discovery Islands region of British Columbia. For pink and chum salmon we tested for the dependency of sea louse abundance on temperature, salinity, sampling period, host species, and farm exposure category. For both louse species, farm exposure was the only consistently significant predictor of sea lice abundance. Fish exposed to salmon farms were infected with more sea lice than those in the peripheral category. Sea louse abundance on sockeye salmon and Pacific herring followed the same trends, but sample sizes were too low to support formal statistical analysis. The Pacific herring were translucent and lacked scales, and they were primarily parasitized by C. clemensi. These results suggest that the association of salmon farms with sea lice infestations of wild juvenile fish in Pacific Canada now extends beyond juvenile pink and chum salmon in the Broughton Archipelago. Canada's most abundant and economically valuable salmon populations, as well as British Columbia's most valuable Pacific herring stock, migrate through the Discovery Islands; hence, parasite transmission from farm to wild fish in this region may have important economic and ecological implications.

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Parasites of herring ( Clupea harengus L.) larvae from a local Norwegian fjord stock

Cited by 2 publications

References 0 publications

North Sea herring (Clupea harengus L.) recruitment failure may be indicative of poor feeding success

North Sea herring (Clupea harengus L.) recruitment failure may be indicative of poor feeding success

Sea Louse Infestation in Wild Juvenile Salmon and Pacific Herring Associated with Fish Farms off the East‐Central Coast of Vancouver Island, British Columbia

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