Publications

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nematode infestation of fillets from atlantic cod, gadus morhua, off eastern canada.the prevalence and intensity of larval nematodes in fillets of atlantic cod, gadus morhua, were examined and compared with similar data from a previous survey conducted about 30 yr ago. anisakis simplex occurred more often in the nape of the fillet, whereas pseudoterranova decipiens was the predominant species in napeless fillets. the results suggest an increase in both the prevalence and intensity of p. decipiens in fillets of cod, especially those originating from the gulf of st. lawrence and ...19883193325
prevalence and influence of loma branchialis (microspora) on growth and mortality in atlantic cod (gadus morhua) in coastal newfoundland.a study was conducted to determine the prevalence, geographical distribution, and effects of a microsporan parasite, loma branchialis, in atlantic cod in coastal newfoundland. the parasite was identified microscopically as opaque, ovoid xenomas, primarily in the gills, heart, and spleen. although widely distributed in young fish inhabiting 7 coastal localities, prevalence was 1-7% in general, <0.01% in older and large fish, but 78% in market-size cod from a commercial farm. some of the latter fi ...200516419777
influence of environmental changes in the north-western atlantic ocean on a parasite, echinorhynchus gadi (acanthocephala) of atlantic cod ( gadus morhua) occurring off coastal labrador, canada.a study was conducted to determine the influence of environmental change on an endoparasite, echinorhynchus gadi (acanthocephala) of atlantic cod (gadus morhua) over a 30-year period off the coast of labrador in the north-western atlantic, north atlantic fisheries organization subareas 2j-3k. cod, once an abundant fish species that had been commercially exploited for many decades, declined precipitously during the mid-1980s onwards. this decline was attributed to climatic changes that affected t ...200818452629
structural and functional connectivity of marine fishes within a semi-enclosed newfoundland fjord.the interplay between structural connectivity (i.e. habitat continuity) and functional connectivity (i.e. dispersal probability) in marine fishes was examined in a coastal fjord (holyrood pond, newfoundland, canada) that is completely isolated from the north atlantic ocean for most of the year. genetic differentiation was described in three species (rainbow smelt osmerus mordax, white hake urophycis tenuis and atlantic cod gadus morhua) with contrasting life histories using seven to 10 microsate ...200920738621
comparison of metazoan parasites of atlantic cod, gadus morhua , from three geographical areas of coastal newfoundland.abstract this study compared metazoan parasites in the digestive tract of atlantic cod, gadus morhua , captured from 3 geographical areas off the northeastern (ne), southeastern (se), and southwestern (sw) coasts of newfoundland. samples were obtained by line trawl and frozen after capture, and the digestive tract was subsequently examined for metazoan parasites following conventional parasitological methods. mean abundance of nematodes, but not the trematodes, and an acanthocephalan was signifi ...201121506772
a moderate increase in ambient temperature modulates the atlantic cod (gadus morhua) spleen transcriptome response to intraperitoneal viral mimic injection.atlantic cod (gadus morhua) reared in sea-cages can experience large variations in temperature, and these have been shown to affect their immune function. we used the new 20k atlantic cod microarray to investigate how a water temperature change which, simulates that seen in newfoundland during the spring-summer (i.e. from 10°c to 16°c, 1°c increase every 5 days) impacted the cod spleen transcriptome response to the intraperitoneal injection of a viral mimic (polyriboinosinic polyribocytidylic ac ...201222928584
low plastic ingestion rate in atlantic cod (gadus morhua) from newfoundland destined for human consumption collected through citizen science methods.marine microplastics are a contaminant of concern because their small size allows ingestion by a wide range of marine life. using citizen science during the newfoundland recreational cod fishery, we sampled 205 atlantic cod (gadus morhua) destined for human consumption and found that 5 had eaten plastic, an ingestion prevalence rate of 2.4%. this ingestion rate for atlantic cod is the second lowest recorded rate in the reviewed published literature (the lowest is 1.4%), and the lowest for any fi ...201627771096
examination of fine-scale spatial-temporal overlap and segregation between two closely related congeners gadus morhua and gadus ogac in coastal newfoundland.the spatial and temporal movement patterns of sympatric juvenile atlantic cod gadus morhua and greenland cod gadus ogac were studied using high-resolution radio-acoustic positioning in a coastal area of newfoundland during the summers of 2009 and 2010. a total of 20 fish (10 g. ogac and 10 g. morhua) were equipped with acoustic transmitters and monitored for periods up to 23 days. most fishes showed high site fidelity with mean residence times of 12·4 (g. morhua) and 14·4 days (g. ogac). a few i ...201425041096
factors regulating early life history dispersal of atlantic cod (gadus morhua) from coastal newfoundland.to understand coastal dispersal dynamics of atlantic cod (gadus morhua), we examined spatiotemporal egg and larval abundance patterns in coastal newfoundland. in recent decades, smith sound, trinity bay has supported the largest known overwintering spawning aggregation of atlantic cod in the region. we estimated spawning and dispersal characteristics for the smith sound-trinity bay system by fitting ichthyoplankton abundance data to environmentally-driven, simplified box models. results show pro ...201324058707
effects of gill-net fishing on marine birds in a biological hotspot in the northwest atlantic.marine biological hotspots, or areas where high abundances of species overlap in space and time, are ecologically important areas because energy flow through marine food webs, a key ecosystem process, is maximized in these areas. i investigated whether top predators aggregated at persistent spawning sites of a key forage fish species, capelin (mallotus villosus), on the ne coast of newfoundland during july and august 2000-2003. by examining the distributional patterns of top predators through sh ...200717650253
mitochondrial dna sequence variation and genetic stock structure of atlantic cod (gadus morhua) from bay and offshore locations on the newfoundland continental shelf.bay cod, atlantic cod (gadus morhua) that over-winter in the deep-water bays of north-eastern newfoundland, have historically been regarded as distinct in migration and spawning behaviour from offshore (grand bank) cod stocks. to investigate their genetic relationships, we determined the dna sequence of a 307-base-pair portion of the mitochondrial cytochrome b gene for 236 adult cod taken from the waters off north-eastern newfoundland, including fish found over-wintering and spawning in trinity ...19957711956
polycyclic aromatic compounds in cod (gadus morhua) from the northwest atlantic and st. lawrence estuary.there is limited information available on levels of polycyclic aromatic hydrocarbons (pah) in major fish populations including populations from the northwest atlantic. the cod (gadus morhua) stocks off eastern canada form the basis of one of the world's most important fisheries. muscle tissues of cod collected from northwest atlantic fisheries organisation (nafo) management divisions 2j, 3k and 3ps off newfoundland and labrador, as well as three contaminated sites in the gulf of st. lawrence wer ...19948016631
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