Erratum: Lipid class and nonesterified fatty acid profiles in plasma of North Atlantic cod (Gadus morhua)

2006 ◽  
Vol 63 (2) ◽  
pp. 470 ◽  
Author(s):  
T Alkanani ◽  
C C Parrish ◽  
K J Rodnick ◽  
A K Gamperl
Keyword(s):  
Fatty Acid ◽  
Lipid Class ◽  
North Atlantic ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Nonesterified Fatty Acid ◽  
Fatty Acid Profiles

Influence of climatic changes on the parasites of Atlantic cod Gadus morhua off coastal Labrador, Canada

2006 ◽  
Vol 80 (2) ◽  
pp. 193-197 ◽  
Author(s):  
R.A. Khan ◽  
C.V. Chandra
Keyword(s):  
North Atlantic ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Age Groups ◽  
Climatic Conditions ◽  
Otter Trawl ◽  
Commercial Fishery ◽  
Metazoan Parasites ◽  
Mean Values ◽  
The North

AbstractA study was conducted in 2000 and 2003, following the collapse of the commercial fishery in 1990, to compare metazoan parasites of Atlantic cod Gadus morhua, captured off coastal Labrador, with samples taken in 1980 and 1986. Fish were captured by otter trawl offshore in the North Atlantic Fish Organisation subarea 2J. Parasites were removed from the digestive tract, stained, identified and compared between the different groups. Both the prevalence and mean abundance of trematodes, larval nematodes and E. gadi were significantly lower in fish taken in 2000 and 2003 than in 1980. While mean values of trematodes and nematodes declined in 1986, those of Echinorhynchus gadi remained unchanged in 1986 and 1990. Four-year-old cod sampled in 1990 harboured significantly fewer E. gadi than older age groups. The most commonly occurring trematodes included Podocotylereflexa, Lepidapedon elongatum, Derogenes varicus and Hemiurus levinseni while the larval nematode, Anisakis sp. was predominant. Comparison of offshore samples taken in 2000 and 2003 with others taken in previous years suggests an overall decline of parasites coincident with a change in climatic conditions, the absence of a major food source, namely capelin Mallotus villosus, of cod and ultimately the decline of the Labrador population.

scholarly journals Diet-induced differences in the essential fatty acid (EFA) compositions of larval Atlantic cod (Gadus morhua L.) with reference to possible effects of dietary EFAs on larval performance

2006 ◽  
Vol 63 (2) ◽  
pp. 302-310 ◽  
Author(s):  
C.J. Cutts ◽  
J. Sawanboonchun ◽  
C. Mazorra de Quero ◽  
J.G. Bell
Keyword(s):  
Fatty Acid ◽  
Essential Fatty Acid ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Lipid Level ◽  
Larval Growth ◽  
Somatic Tissue ◽  
Larval Performance ◽  
Experimental Diet ◽  
Live Feed

Abstract We studied the performance of cod rearing in which live feed was given under three different essential fatty acid (EFA) enrichment regimes, using commercially available live-feed enrichments. We assessed the fatty acid profile [docosahexaenoic (DHA), eicosapentaenoic (EPA), and arachidonic acid (AA)] in larval somatic tissue, relative to its amounts in both rotifers and Artemia as well as to larval performance. Overall, percentage lipid level of each experimental diet for the trial was approximately 50%. Further, there were no significant differences in total fatty acid levels of larvae from each treatment at the end of the trial (mean = 444.76 μg fatty acid per mg lipid). However, during the rotifer phase, larvae from each treatment were able to incorporate comparable levels of %DHA, irrespective of levels in the diet. Despite this, the rotifer diet with more %DHA still promoted better larval growth than other treatments. Conversely, larvae from two of the treatments did not exhibit any accumulation of AA, reflecting levels found in the diet instead. However, between-tank differences in larval %AA showed improved growth during the rotifer period when larval %AA was high. Low ratios of EPA had no effect. During the Artemia phase, percentage levels of larval DHA decreased; there was no accumulation of DHA relative to dietary levels, which in Artemia were significantly lower than in rotifers (6 cf. 20–30%). However, DHA levels in larvae at the end of the experiment correlated positively with survival. Artemia contained lower levels of AA than rotifers (1.5 cf. 3.0%), yet comparable levels of AA were found in rotifer-fed and Artemia-fed larvae. This also differed significantly between treatments, and correlated positively with survival.

scholarly journals Bacterial composition and succession during storage of North-Atlantic cod (Gadus morhua) at superchilled temperatures

2009 ◽  
Vol 9 (1) ◽  
pp. 250 ◽  
Author(s):  
Eyjólfur Reynisson ◽  
Hélène L Lauzon ◽  
Hannes Magnússon ◽  
Rósa Jónsdóttir ◽  
Guðrún Ólafsdóttir ◽  
...  
Keyword(s):  
North Atlantic ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Bacterial Composition

What is the carrying capacity for fish in the ocean? A meta-analysis of population dynamics of North Atlantic cod

2001 ◽  
Vol 58 (7) ◽  
pp. 1464-1476 ◽  
Author(s):  
Ransom A Myers ◽  
Brian R MacKenzie ◽  
Keith G Bowen ◽  
Nicholas J Barrowman
Keyword(s):  
North Atlantic ◽  
Carrying Capacity ◽  
Empirical Bayes ◽  
Gadus Morhua ◽  
Mixed Model ◽  
Atlantic Cod ◽  
Unit Area ◽  
Meta Analysis ◽  
Reproductive Rate ◽  
Parameter Estimates

Population and community data in one study are usually analyzed in isolation from other data. Here, we introduce statistical methods that allow many data sets to be analyzed simultaneously such that different studies may "borrow strength" from each other. In the simplest case, we simultaneously model 21 Atlanic cod (Gadus morhua) stocks in the North Atlantic assuming that the maximum reproductive rate and the carrying capacity per unit area are random variables. This method uses a nonlinear mixed model and is a natural approach to investigate how carrying capacity varies among populations. We used empirical Bayes techniques to estimate the maximum reproductive rate and carrying capacity of each stock. In all cases, the empirical Bayes estimates were biologically reasonable, whereas a stock by stock analysis occasionally yielded nonsensical parameter estimates (e.g., infinite values). Our analysis showed that the carrying capacity per unit area varied by more than 20-fold among populations and that much of this variation was related to temperature. That is, the carrying capacity per square kilometre declines as temperature increases.

Effects of Fish Meal Replacement with Full-Fat Soy Meal on Growth and Tissue Fatty Acid Composition in Atlantic Cod (Gadus morhua)

2007 ◽  
Vol 55 (14) ◽  
pp. 5788-5795 ◽  
Author(s):  
Vasileios Karalazos ◽  
Jim Treasurer ◽  
Christopher J. Cutts ◽  
Richard Alderson ◽  
Trine F. Galloway ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Gadus Morhua ◽  
Fish Meal ◽  
Atlantic Cod ◽  
Meal Replacement ◽  
Tissue Fatty Acid Composition ◽  
Soy Meal ◽  
Fish Meal Replacement

Parasites as biological indicators of stocks of Atlantic cod (Gadus morhua) off Newfoundland, Canada

1995 ◽  
Vol 52 (S1) ◽  
pp. 195-201 ◽  
Author(s):  
R.A. Khan ◽  
C. Tuck
Keyword(s):  
Continental Shelf ◽  
North Atlantic ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Biological Indicators ◽  
Blood Feeding ◽  
Size Class ◽  
Paired Comparisons ◽  
Pseudoterranova Decipiens

Atlantic cod (Gadus morhua) were collected from six locations on the continental shelf off Newfoundland, Canada, including one inshore area and examined for parasites from 1981 to 1983. The protozoan Loma branchialis was more prevalent in North Atlantic Fisheries Organization (NAFO) areas 3Pn-4R (Gulf of St. Lawrence) and 2J-3K (Labrador), whereas the acanthocephalan Echinorhynchus gadi was more abundant in the latter than in other locations. Similarly, the prevalence and (or) abundance of the fillet-inhabiting larval nematode Pseudoterranova decipiens and the blood-feeding copepod Lernaeocera branchialis were significantly greater in fish from 3Ps (St. Pierre Bank) and 3Pn-4R than from all adjacent areas. Gastrointestinal ascaridoid nematodes were more abundant in 3M (Flemish Cap) cod than in other localities. No differences in the prevalence and abundance of E. gadi were detected in samples in relation to sex or size class. Paired comparisons of transformed data for the different parasite taxa revealed that there were more significant differences than similarities in cod sampled from adjacent NAFO divisions. These observations based on selected parasites (Loma branchialis, Trypanosoma murmanensis, Myxidium gadi, P. decipiens, gastrointestinal ascaridoid nematodes, E. gadi, and Lernaeocera branchialis) support the view that discrete stocks of cod inhabit the Newfoundland–Labrador continental shelf.

Temperature and the recruitment of Atlantic cod (Gadus morhua)

1999 ◽  
Vol 56 (11) ◽  
pp. 2069-2077 ◽  
Author(s):  
B Planque ◽  
T Frédou
Keyword(s):  
North Atlantic ◽  
Gadus Morhua ◽  
Cold Water ◽  
Atlantic Cod ◽  
The Other ◽  
Warm Water ◽  
The North ◽  
The North Atlantic ◽  
Interannual Fluctuations ◽  
The Relationship

Variability in the recruitment of fish has been attributed to either changes in the environment or variations in the size of reproductive stocks. Disentangling the effects of environment and stock has proven to be problematic and has resulted in recurrent controversy between studies supporting either hypothesis. In the present study, we examine the relationship between interannual changes in temperature and variation in recruitment for nine Atlantic cod (Gadus morhua) stocks in the North Atlantic. We show that for individual stocks, the relationship often appears weak and statistically not significant. On the other hand, by combining in a single metaanalysis the results from individual stocks, we demonstrate that recruitment of Atlantic cod is linked to interannual fluctuations in temperature in such a way that for stocks located in warm water the relationship is negative, for stocks located in cold water the relationship is positive, and there is no relationship for stocks located in the middle of the temperature range.

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