Environmental and stock effects on spawning origins and recruitment of cod Gadus morhua

Begg, Gavin A.; Marteinsdóttir, Guðrún

doi:10.3354/meps229263

Cited by 44 publications

(27 citation statements)

References 38 publications

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“…This distribution may well represent an adaptation to differential current and transport mechanisms. Drift of eggs in the area close to shore is thought to be governed by the westward-flowing coastal current induced by the freshwater runoff of the large glacial rivers on the south shore of Iceland (Olafsson 1985, Thordardottir 1986, Marteinsdottir et al 2000b, Begg & Marteinsdottir 2002c. The neutral buoyancy of the larger eggs would position them within the lower range of the upper density layer.…”

Section: Discussionmentioning

confidence: 99%

Essential relationships incorporating the influence of age, size and condition on variables required for estimation of reproductive potential in Atlantic cod Gadus morhua

Marteinsdóttir¹,

Begg²

2002

Mar. Ecol. Prog. Ser.

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280

244

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Evidence accumulated over the last decade indicates that reproductive potential of marine fish stocks is not correctly represented by spawning stock biomass. Fundamental variables that affect reproductive potential of fish stocks (i.e. proportion mature at age, fecundity, and offspring size and viability) have found to vary with age, size, and condition of spawning fish, and/or spawning experience. Modeling initiatives that attempt to describe reproductive potential by incorporating all available information on reproductive variables require extensive, high quality data of a temporal and spatial origin. In this study, we explored the influence of female age, size, and condition on several reproductive variables for the cod Gadus morhua, including maturity, fecundity, egg density and size, and larval size and growth. In addition, we described the potential for annual variation in these relationships to increase our knowledge of temporal stability for fundamental variables that influence reproductive potential.

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Section: Discussionmentioning

confidence: 99%

Essential relationships incorporating the influence of age, size and condition on variables required for estimation of reproductive potential in Atlantic cod Gadus morhua

Marteinsdóttir¹,

Begg²

2002

Mar. Ecol. Prog. Ser.

Self Cite

280

244

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show abstract

“…Consequently, extensive interand intra-stock variation in vital life history characteristics such as growth and maturity have been demonstrated (e.g., Beacham, 1982;Brander, 2000;Marteinsdottir and Begg, 2002;Lambert et al, 2003). Despite such life history variation and the existence of multiple spawning components within stocks (Begg and Marteinsdottir, 2002a), all regional cod stocks in the north Atlantic are currently assessed as single homogenous units (Marteinsdottir et al, 2005). Likewise, cod in Icelandic waters have historically been assumed to belong to a single stock with major spawning areas identified off the south coast (Jonsson, 1982;Schopka, 1994;Marteinsdottir et al, 2000a).…”

Section: Introductionmentioning

confidence: 98%

Discrimination between Icelandic cod (Gadus morhua L.) populations from adjacent spawning areas based on otolith growth and shape

2006

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“…Reproductive success refers to the probability that offspring will survive to reproductive age, and it will be impacted by both reproductive output and factors affecting the survival rate of that output (LowerreBarbieri 2009). Our conceptual model assumes that reproductive resilience in marine fishes increases with increased diversity in spatio-temporal spawning behavior, given the importance of these factors to reproductive success (Begg & Marteinsdottir 2002, Rowe & Hutchings 2003. Further, it assumes that reproductive resilience, especially to fishing, is affected by the relationship between size and/or age and a range of reproductive traits (Fig.…”

Section: Introductionmentioning

confidence: 99%

Assessing reproductive resilience: an example with South Atlantic red snapper Lutjanus campechanus

Lowerre‐Barbieri¹,

Crabtree²,

Switzer³

et al. 2015

Mar. Ecol. Prog. Ser.

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We developed a conceptual model of reproductive resilience based on spatio-temporal diversity in spawning activity and the 'big old fat fecund female fish' effect, i.e., trends in reproductive traits with size and age. We chose red snapper Lutjanus campechanus as our case study, as this species is highly fecund, currently overfished, and long-lived (50+ yr). The intrinsic reproductive resilience of red snapper was assessed in terms of spawning site distribution, variability in time of spawning, and potential reproductive lifespan. To assess how age truncation might erode reproductive resilience, we evaluated the strength of the relationship between size and age and the following traits: spawning habitat, reproductive timing, batch fecundity, and egg quality. Few fish were older than 7 yr. Although younger fish occurred in a more restricted range of depths, there was no trend between size or age and depth. Spawning activity was well distributed over space and time, with actively spawning females collected at 92 of 195 sampling sites over an extended spawning season. Larger, older females exhibited longer spawning periods and higher batch fecundities, but neither greater spawning frequency nor egg dry weight. The ratio of the effective to predicted reproductive lifespan at maximum sustainable yield was 31%. Many parameters estimated in this study are common to fish reproductive studies, but we hope that integrating them into a reproductive resilience framework will help focus the need for research on the underlying relationships between reproductive traits and stock productivity.

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Environmental and stock effects on spawning origins and recruitment of cod Gadus morhua

Cited by 44 publications

References 38 publications

Essential relationships incorporating the influence of age, size and condition on variables required for estimation of reproductive potential in Atlantic cod Gadus morhua

Essential relationships incorporating the influence of age, size and condition on variables required for estimation of reproductive potential in Atlantic cod Gadus morhua

Discrimination between Icelandic cod (Gadus morhua L.) populations from adjacent spawning areas based on otolith growth and shape

Assessing reproductive resilience: an example with South Atlantic red snapper Lutjanus campechanus

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