Evidence for inshore spawning of northern Atlantic cod (<i>Gadus morhua</i>) in Trinity Bay, Newfoundland, 1991-1993

Smedbol, R. Kent; Wroblewski, Joe

doi:10.1139/f96-146

Cited by 31 publications

(34 citation statements)

References 25 publications

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“…Being kept at shallower depths and on the perimeter of the spawning shoals would reduce the probability of farmed males gaining access to ovulating females. This may be the case in larger offshore spawning grounds, but smaller inshore spawning grounds (Smedbol & Wroblewski 1997) that have been severely depleted may present fewer obstacles for access to females, especially if a small resident group of wild males associated with a nearly extirpated assemblage were to be overwhelmed by a large number of escaped triploid males. A typical sea cage of triploid cod could contaiñ 50 000 fish, and if 50% are males then a large fraction of escaped males attempting to court wild females in a spawning assemblage numbering in the hundreds to thousands could be triploids.…”

Section: Discussionmentioning

confidence: 99%

Competitive spawning success and fertility of triploid male Atlantic cod Gadus morhua

Feindel¹,

Benfey²,

Trippel³

2010

Aquaccult. Environ. Interact.

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Farmed Atlantic cod Gadus morhua have been hypothesized to pose a risk to the natural environment through escape of fish or release of their gametes from sea cages. The use of sterile triploids has been suggested as a way to prevent spawning of farmed fish, whether escaped from their cages or still contained within them. This laboratory study examined the reproductive potential of triploid male Atlantic cod, both in vivo and in vitro. We demonstrated that triploid males in competitive, size-matched mating with diploid males were successful at siring young. Spermatozoa produced by triploid males were larger than those of diploids, but did not differ in swimming velocity or ability to fertilize eggs. Hatch and larval survival rates, however, were reduced for progeny of triploid males. These diagnostic characteristics of aneuploidy suggest that although farmed triploid male cod may compete successfully with wild diploids for spawning access to wild females, their offspring will not survive.

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Section: Discussionmentioning

confidence: 99%

Competitive spawning success and fertility of triploid male Atlantic cod Gadus morhua

Feindel¹,

Benfey²,

Trippel³

2010

Aquaccult. Environ. Interact.

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“…Female cod release eggs in batches over spawning intervals of 2 or more days (Kjesbu, 1989;Fordham and Trippel, 1999). Known spawning locations around Newfoundland and Labrador are widespread, including outer portions of the Labrador shelf (notably the Hamilton Bank and Hawke Channel), northeast Newfoundland Shelf, northern and southern Grand Banks, Halibut Channel and St Pierre Bank, as well as several inshore areas, such as Trinity and Placentia Bays, though spawning may also occur at varying locations during migration (Templeman and May, 1965;Serebryakov, 1967;Fitzpatrick and Miller, 1979;Rose, 1993;Smedbol and Wroblewski, 1997).…”

Section: Introductionmentioning

confidence: 99%

Atlantic cod (Gadus morhua) feed during spawning off Newfoundland and Labrador

Krumsick

Rose

2012

ICES Journal of Marine Science

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We test a current assumption that Atlantic cod (Gadus morhua) off Newfoundland and Labrador, Canada, do not feed during the protracted spawning season (March-September). Stomach contents were analysed from 10 473 cod from four Northwest Atlantic Fisheries Organization regions (2J, 3K, 3L, and 3Ps) over 9 years from which gonads were also analysed to determine sex and maturity status. Adult cod in spawning condition did feed in all regions, usually at rates equivalent to or even greater than non-spawning fish and juveniles. Both sexes fed during spawning, though females consumed lesser amounts. Regional differences were evident. The total fullness index was greater in the northern (2J) than the southern (3Ps) region, with no consistent differences between spawners and non-spawners. The most southerly region (3Ps) exhibited the greatest prey diversity, the northern region (2J) the least. Shrimp was the major diet item in the northern regions. Capelin, zooplankton, crab, and other fish increased in importance to the south. Differences in prey items between non-spawning and spawning individuals of both sexes were possibly related to spawning behaviour. Models using consumption rates should not assume that cod do not feed during the protracted spawning season in these waters.

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“…Atlantic cod (Gadus morhua) in the northwest Atlantic comprise several "meta-populations" with widespread spawning at locations and times that remain poorly known, both in the coastal regions and on the offshore banks (Smedbol and Wroblewski, 1997;Rose, 2007;Rose et al, 2011). Knowledge of spawning location and timing is essential for stock delineation and to enable spawning closures and the ecosystem-based management that is currently being developed (DFO, 2007).…”

Section: Introductionmentioning

confidence: 99%

Acoustic markers of Atlantic cod (Gadus morhua) spawning in coastal Newfoundland

Knickle

Rose

2012

Fisheries Research

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Evidence for inshore spawning of northern Atlantic cod (Gadus morhua) in Trinity Bay, Newfoundland, 1991-1993

Cited by 31 publications

References 25 publications

Competitive spawning success and fertility of triploid male Atlantic cod Gadus morhua

Competitive spawning success and fertility of triploid male Atlantic cod Gadus morhua

Atlantic cod (Gadus morhua) feed during spawning off Newfoundland and Labrador

Acoustic markers of Atlantic cod (Gadus morhua) spawning in coastal Newfoundland

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