Variant colourations of Atlantic cod (Gadus morhua) in Newfoundland and Labrador nearshore waters

Gosse, Karen R.; Wroblewski, J. S.

doi:10.1016/j.icesjms.2004.04.003

Cited by 22 publications

(14 citation statements)

References 13 publications

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“…It was, however, evident that wild cod were more yellow (b Ã ) than farmed ¢sh. When kept in netpens for 3 months, cod lost its initially red pigmentation (Gosse & Wroblewski 2004). Even though there were no signi¢cant di¡erences, there was a tendency that the skin colour measurements both above and below the lateral line tended to be less red for the group fed only ¢shmeal, compared with the groupsfed diets containing krillmeal.…”

Section: Discussionmentioning

confidence: 91%

Effect of Antarctic krillmeal on quality of farmed Atlantic cod (Gadus morhua L.)

2006

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Farmed Atlantic cod with a mean weight of 4.8 kg were maintained for 9 weeks in sea cages and fed diets where the dietary ¢shmeal component was substituted with increasing proportions (0%, 22%, 63% and100%) of meal from Antarctic krill, Euphausia superba.Wild-caught cod were included in the study as external control. At termination of feeding, all ¢sh were slaughtered and muscle pH was immediately recorded. The ¢sh were then stored on ice for three days and assessed for muscle pH and objective (skin and ¢llet colour, and ¢llet texture) and subjective (sensory evaluation) quality criteria. Replacement of ¢shmeal with krillmeal in the diets resulted in the skin colour above and below the lateral line to be more red than the control group without krillmeal substitutions, even though this di¡erence was not signi¢cant, and with more yellow hue. Additions of krillmeal increased the muscle whiteness and yellow hue compared with the control group and wild ¢sh. There was no di¡erence in red hue between the groups. Muscle pH, texture or sensory attributes were una¡ected by dietary inclusion level of krillmeal. Wild-caught cod deviated in several aspects from the farmed cod. It is concluded that the replacement of ¢shmeal with Antarctic krillmeal in the diets two months before slaughter did not move the sensory attributes more towards wild ¢sh.

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Section: Discussionmentioning

confidence: 91%

Effect of Antarctic krillmeal on quality of farmed Atlantic cod (Gadus morhua L.)

2006

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“…2004). In wild Atlantic cod ( Gadus morhua , Gadidae), the golden/reddish‐brown colour of the skin originates from an invertebrate‐based diet rich in carotenoids, which was also lost under reared conditions (Gosse and Wroblewski 2004). The effect of dietary carotenoids on the expression of skin colour has also been reported in red sea bream (Ibrahim et al.…”

Section: Types Of Morphological Skin Colour Changesmentioning

confidence: 99%

“…Improper feed composition, unforeseen variations in diet quality or poor feeding alone can lead to malpigmentation under domestication. Under natural conditions, a given species evolving in distinct habitats and feeding on different diets can also exhibit variations in skin coloration, as shown in wild cod (Gosse and Wroblewski 2004). In ecological studies, nutrition is a basic criterion to consider when analysing skin colour displacement and species divergence in wild populations inhabiting different habitats.…”

Section: Types Of Morphological Skin Colour Changesmentioning

confidence: 99%

Morphological skin colour changes in teleosts

2010

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Morphological skin colour change in fish is often referred to in the sole context of background adaptation. It is becoming increasingly apparent that it is a broad phenomenon elicited by a variety of factors. To date, no review has attempted to integrate the different types of morphological colour changes occurring in teleosts, their ecological origins and the regulatory mechanisms involved, often restricting the view on the subject. First, the origin of skin colour is addressed in teleosts including chromatophore type and distribution, pigment biosynthetic pathways and their interactions to one-another. Second, the different types of morphological colour changes occurring in teleosts are categorized and a key distinction is made between proximate and ultimate morphological colour changes. These are defined respectively as the change of phenotype during an established life-stage in response to environmental interactions and during the transition between two developmental-stages phenotypically pre-adapted to their ancestral ecosystems. Nutrition and UV-light are primary factors of proximate morphological colour changes beyond the control of the organism. By contrast, background light conditions and social interactions are secondary proximate factors acting through the control of the organism. Highly diversified among teleosts, ultimate morphological skin colour changes are presented in term of alterations in skin structure and pigment deposition during metamorphosis in different species. Finally, the physiological and endocrine mechanisms regulating both proximate and ultimate morphological colour changes are reviewed

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“…The primary objective of the Gilbert Bay MPA is to protect its resident population of Gadus morhua Linnaeus, 1758 Atlantic cod (Green & Wroblewski, 2000;Morris & Green, 2002). These cod have a reddish or golden-brown colour due to their carotenoid-rich diet of invertebrates (Gosse & Wroblewski, 2004;Wroblewski et al, 2005). The Gilbert Bay cod population is genetically distinguishable from coastal cod of eastern Newfoundland and from offshore cod of the Grand Banks (Ruzzante et al, 2000;Beachem et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

The fish fauna of Gilbert Bay, Labrador: a marine protected area in the Canadian subarctic coastal zone

et al. 2007

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The fish fauna of Gilbert Bay, Labrador: a marine protected area in the Canadian subarctic coastal zoneThe Marine Protected Area in Gilbert Bay, Labrador is the first established in the subarctic coastal zone of eastern Canada. A standardized survey of the fish fauna of Gilbert Bay was initiated during the ice-free season of 2004 to provide baseline information on the fish present in water less than 15 m deep. Beach seines and gill-nets sampled three management zones within the bay which are afforded different levels of protection from human activity. The 25 species in 15 families recorded belong to five ecological guilds: (1) estuarine and marine fish resident in the bay; (2) anadromous species transiting the bay; (3) marine species which migrate into the bay to spawn; (4) offshore-spawning marine fish for which the bay is a nursery area; and (5) marine species which occasionally migrate into the bay to feed. Gilbert Bay lies in a transition zone between Arctic and coldtemperate biogeographical provinces, and its fish fauna is dissimilar from a cold-temperate fish assemblage described for Trinity Bay in eastern Newfoundland.

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Variant colourations of Atlantic cod (Gadus morhua) in Newfoundland and Labrador nearshore waters

Cited by 22 publications

References 13 publications

Effect of Antarctic krillmeal on quality of farmed Atlantic cod (Gadus morhua L.)

Effect of Antarctic krillmeal on quality of farmed Atlantic cod (Gadus morhua L.)

Morphological skin colour changes in teleosts

The fish fauna of Gilbert Bay, Labrador: a marine protected area in the Canadian subarctic coastal zone

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