Geographical variations in abundance of larval anisakine nematodes in Atlantic cod (Gadus morhua) and American plaice (Hippoglossoides platessoides) from the Gulf of St. Lawrence

Boily, F; Marcogliese, David J.

doi:10.1139/f95-516

Cited by 35 publications

(35 citation statements)

References 30 publications

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“…Disregarding discrepancies that can be ascribed to variation in methodology, the nematode prevalence and intensity recorded here in Atlantic cod is generally in agreement with values observed also in waters off northern Canada and Norway (Brattey and Bishop 1992, Boily and Marcogliese 1995, Hemmingsen et al 2000. Regarding parasite prevalence there was a tendency of regional variation, in that Atlantic cod appeared to become more quickly infected in the Sisimiut area than in the Godthaab area.…”

Section: Nematode Prevalence and Intensitysupporting

confidence: 89%

“…Regarding parasite prevalence there was a tendency of regional variation, in that Atlantic cod appeared to become more quickly infected in the Sisimiut area than in the Godthaab area. Similar geographical variation has been observed off Canada, and may in part reflect the distribution of the phocid and cetacean definitive hosts (McClelland et al 1983, Brattey and Bishop 1992, Boily and Marcogliese 1995, McClelland 2002. However, it is difficult to quantify this difference and it is at present impossible to evaluate if the distribution of definitive hosts, which determines nematode composition in this area, influences parasite accumulation in the species studied here.…”

Section: Nematode Prevalence and Intensitysupporting

confidence: 63%

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Occurrence of anisakid nematodes in Atlantic cod (Gadus morhua) and Greenland cod (Gadus ogac), West Greenland

Mouritsen

Hedeholm

Schack

et al. 2010

Acta Parasitologica

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Anisakid nematodes commonly infect gadids, and are of economic and aesthetic importance to the commercial fishing industry in Greenland as some species are pathogenic to humans. However, very little is known about the occurrence of these parasites and their impact on the hosts in Greenland waters. During a survey in 2005, stomach sample of 227 Atlantic cod (Gadus morhua) and 64 Greenland cod (Gadus ogac) was collected in Godthaab and Sisimiut fiord systems in West Greenland waters. All cod were dissected for stomach contents and anisakid nematodes were removed from the visceral cavity. Third stage larvae (L3) of three anisakid species were found, including Contracaecum osculatum (Rudolphi, 1802), Anisakis simplex (Rudolphi, 1809) and Hysterothylacium aduncum (Rudolphi, 1802). Molecular identification by PCR-RFLP indicated the presence of A. simplex s.s. and the sibling species C. osculatum B and C. The prevalence of infection by C. osculatum was higher in Greenland cod (84.3%) than in Atlantic cod (73.9%) whereas the prevalence of A. simplex showed an opposite pattern (Greenland cod 8.3%; Atlantic cod 24.2%). Only one G. morhua (1.0%) was infected by H. aduncum. No gender specific difference in both nematode species regarding prevalence of infection and mean infection intensity was evident, and there was no relationship between fish condition and the intensity of nematode infections. Standardised for size, capelin-eating cod were in better condition and more heavily infected than fish subsisting on alternative prey at the point of collection. Hence, nematode infections in the two gadids seem governed in part by feeding behaviour, and capelin appears a significant source of larval anisakids.

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Section: Nematode Prevalence and Intensitysupporting

confidence: 89%

Section: Nematode Prevalence and Intensitysupporting

confidence: 63%

Occurrence of anisakid nematodes in Atlantic cod (Gadus morhua) and Greenland cod (Gadus ogac), West Greenland

Mouritsen

Hedeholm

Schack

et al. 2010

Acta Parasitologica

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“…Being long-lived, larval anisakids lying dormant for extended periods in their ¢sh hosts tend to accumulate. Their abundance has been shown to generally increase with host size, for example in cod (Boily & Marcogliese, 1995), a desirable characteristic for a parasite tag. In addition, infections showed strong geographical variations in both prevalence and mean abundance.…”

Section: Nematodesmentioning

confidence: 99%

Metazoan parasites of the lesser-spotted dogfish Scyliorhinus canicula and their potential as stock discrimination tools

Moore

2001

J. Mar. Biol. Ass.

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The metazoan parasites of 101 lesser-spotted dog¢sh Scyliorhinus canicula from locations o¡ the coast of England (Plymouth and the eastern Solent) and Wales (Cardigan Bay) were surveyed and assessed for their potential as stock discrimination tools.A total of ten parasite species was found using a relatively rapid host examination technique suitable for non-parasitologists. On the basis of established criteria, larval anisakid nematodes and the copepod Lernaeopoda galei were selected as being potentially useful as stock discrimination tools. The monogeneans Leptocotyle minor and Hexabothrium appendiculatum may be suitable as markers following further investigation of their response to handling stress.

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“…Over 60 species are infected in the North Atlantic alone (McClelland et al 1990). While three sibling species of P. decipiens exist in the North Atlantic, designated A, B, and C (Paggi et al 1991), it is presumed that sealworm from the Gulf of St. Lawrence belong to P. decipiens B (see Boily and Marcogliese 1995, Marcogliese et al 1996, Marcogliese, 2001, now formally referred to as P. decipiens (sensu stricto) (Paggi et al 2000).…”

Section: S Ealworm (Pseudoterranova Decipiens)mentioning

confidence: 99%

Distribution and abundance of sealworm (Pseudoterranova decipiens) and other anisakid nematodes in fish and seals in the Gulf of St. Lawrence: potential importance of climatic conditions

Marcogliese

2001

NAMMCOSP

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Prevalence and abundance of sealworm (Pseudoterranova decipiens) and other anisakid nematodes were determined in a variety of fishes from the Gulf of St. Lawrence in 1990 and. Sealworm abundance and prevalence were also determined in three species of seals in the Gulf between 1988 and 1992. Atlantic cod (Gadus morhua) and shorthorn (Myoxocephalus scorpius) and longhorn sculpin (M. octodecemspinosus) were the fishes most heavily infected with sealworm. Grey seals (Halichoerus grypus) proved to be the most important definitive hosts for sealworm in the Gulf. Abundance of sealworm increased, whereas that of Anisakis simplex and contracaecine nematodes decreased, from north to south in the Gulf. Abundance of sealworm increased compared to earlier surveys in most areas of the Gulf, but decreased in both cod and grey seals during the course of this study. In contrast, abundance of Contracaecum osculatum and Phocascaris spp. in grey seals and cod continued to increase during the study period. Observed increases of nematodes are attributed to growing populations of grey seals (for sealworm) and harp seals (for Contracaecinea). Levels of A. simplex remained relatively constant between 1988 and 1992 in both grey seals and cod. There is no evidence suggesting that observed patterns in nematode abundance were due to changes in grey seal diet. Nor was there any evidence of competition between P. decipiens and C. osculatum in grey seals affecting either sealworm abundance or fecundity. The trends detected herein are attributed to climatic events in the Gulf of St. Lawrence, where water temperatures in the cold intermediate layer consistently decreased between 1986 and 1994. It is suggested that low temperatures inhibited development and hatching of sealworm eggs, but not those of C. osculatum. 113NAMMCO Scientific Publications, Volume 3 D Di is st tr ri ib bu ut ti io on n a an nd d a ab bu un nd da an nc ce e o of f s se ea al lw wo or rm m ( (P Ps se eu ud do ot te er rr ra an no ov va a d de ec ci ip pi ie en ns s) ) a an nd d o ot th he er r a an ni is sa ak ki id d n ne em ma at to od de es s i in n f fi is sh h a an nd d s se ea al ls s i in n t th he e G Gu ul lf f o of f S St t. . L La aw wr re en nc ce e: : p po ot te en nt ti ia al l i im mp po or rt ta an nc ce e o of f c cl li im ma at ti ic c c co on nd di it ti io on ns s

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Geographical variations in abundance of larval anisakine nematodes in Atlantic cod (Gadus morhua) and American plaice (Hippoglossoides platessoides) from the Gulf of St. Lawrence

Cited by 35 publications

References 30 publications

Occurrence of anisakid nematodes in Atlantic cod (Gadus morhua) and Greenland cod (Gadus ogac), West Greenland

Occurrence of anisakid nematodes in Atlantic cod (Gadus morhua) and Greenland cod (Gadus ogac), West Greenland

Metazoan parasites of the lesser-spotted dogfish Scyliorhinus canicula and their potential as stock discrimination tools

Distribution and abundance of sealworm (<i>Pseudoterranova decipiens</i>) and other anisakid nematodes in fish and seals in the Gulf of St. Lawrence: potential importance of climatic conditions

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