Survival and Abundance of Young Atlantic Cod (<i>Gadus morhua</i>) and Haddock (<i>Melanogrammus aeglefinus</i>) as Indicators of Year-class Strength

Campana, Steven E.; Frank, Kenneth T.; Hurley, Peter C. F.; Koeller, Peter; Page, Fred H.; Smith, Peter C.

doi:10.1139/f89-287

Cited by 61 publications

(47 citation statements)

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“…Differentiation of the effects of these variables on pelagic juveniles and earlier life-history stages, therefore, is necessary for resolving recruitment variability in marine fish stocks, particularly as year-class strength is considered to be governed by growth and mortality of these initial stages (Cushing 1973, Campana et al 1989, Mertz & Myers 1994. In this study, we found that spawning origins and demographic characteristics of pelagic juvenile cod in Icelandic waters were significantly related to physical transport mechanisms, ambient environmental conditions, food availability, and size of the spawning stock.…”

Section: Discussionmentioning

confidence: 99%

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

Begg

Marteinsdóttir²

2002

Mar. Ecol. Prog. Ser.

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Section: Discussionmentioning

confidence: 99%

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

Begg

Marteinsdóttir²

2002

Mar. Ecol. Prog. Ser.

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“…The first problem has been described in detail before (Rothschild, 1986;Ulltang, 1996). Bailey et al (1996) and Campana et al (1989) considered it explicitly when constructing survival curves of walleye pollock as well as Nova Scotia cod and haddock cohorts relative to their physical and biological environment. For the Baltic, however, this type of approach has not yet been conducted.…”

Section: Applicability Of Recruitment Modelsmentioning

confidence: 99%

Recruitment of Baltic cod and sprat stocks: identification of critical life stages and incorporation of environmental variability into stock-recruitment relationships

Köster¹,

Hinrichsen²,

Schnack³

et al. 2003

Sci. Mar.

129

103

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SUMMARY:The recruitment processes of Baltic cod and sprat were analysed and critical periods were identified by addressing the major impact factors on individual early life history stages separately and relating observed abundance data between successive stages. For cod, recruitment appeared to be dependent on egg survival, with low oxygen concentration in dwelling depths and predation by clupeids as the major causes for egg mortality. Surviving egg production and larval abundance were weakly correlated, whereas larval abundance was significantly related to year class strength. This indicated that the period between the late egg and the early larval stage is critical for cod recruitment. A potential variable identified to affect this life stage was prey availability for larvae. For sprat, early and late egg stage production as well as late egg stage production and larval abundance were significantly related. However, year class strength was largely independent of larval abundance. Thus, the period between the late larval and early juvenile stage appeared to be critical for sprat recruitment. Potential variables identified to affect this life stage were ambient temperature and wind stress. Environmental factors showing statistically significant covariance with the survival of one of these critical life stages were incorporated into stock-recruitment models for individual spawning areas separately and for the Central Baltic combined.

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“…The first problem has been described in detail previously (Rothschild 1986;Ulltang 1996). Bailey et al (1996) and Campana et al (1989) considered it explicitly when constructing survival curves of walleye pollock as well as Nova Scotia cod and haddock cohorts relative to their physical and biological environment. For the Baltic, however, this type of approach has not been conducted (for a discussion of previous stock-recruitment models, see JarreTeichmann et al 2000).…”

Section: Applicability Of Stock-recruitment Modelsmentioning

confidence: 99%

Developing Baltic cod recruitment models. II. Incorporation of environmental variability and species interaction

Köster¹,

Hinrichsen²,

John³

et al. 2001

Can. J. Fish. Aquat. Sci.

101

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Abstract:We investigate whether a process-oriented approach based on the results of field, laboratory, and modelling studies can be used to develop a stock-environment-recruitment model for Central Baltic cod (Gadus morhua). Based on exploratory statistical analysis, significant variables influencing survival of early life stages and varying systematically among spawning sites were incorporated into stock-recruitment models, first for major cod spawning sites and then combined for the entire Central Baltic. Variables identified included potential egg production by the spawning stock, abiotic conditions affecting survival of eggs, predation by clupeids on eggs, larval transport, and cannibalism. Results showed that recruitment in the most important spawning area, the Bornholm Basin, during 1976-1995 was related to egg production; however, other factors affecting survival of the eggs (oxygen conditions, predation) were also significant and when incorporated explained 69% of the variation in 0-group recruitment. In other spawning areas, variable hydrographic conditions did not allow for regular successful egg development. Hence, relatively simple models proved sufficient to predict recruitment of 0-group cod in these areas, suggesting that key biotic and abiotic processes can be successfully incorporated into recruitment models.Résumé : Nous cherchons à savoir si une approche axée sur les processus et basée sur des études de terrain, de laboratoire et de modélisation peut servir à développer un modèle stock-milieu-recrutement pour la morue franche (Gadus morhua) de la Baltique centrale. À la suite d'une analyse statistique exploratoire, des variables significatives qui influençaient la survie des premiers stades et qui variaient systématiquement d'une site de fraie à un autre ont été incorporées dans des modèles de stock-recrutement, d'abord pour les sites de fraie les plus importants et ensuite combinés pour toute la Baltique centrale. Les variables identifiées comprennent la production potentielle d'oeufs par le stock de géniteurs, les conditions abiotiques qui affectent la survie des oeufs, la prédation des oeufs par les clupéidés, le transport des larves et le cannibalisme. Les résultats indiquent que le recrutement durant la période 1976 à 1995 au site de fraie le plus important, le bassin de Bornholm, était en relation avec la production d'oeufs; cependant, d'autres facteurs significatifs affectaient la survie des oeufs (oxygénation, prédation) et, une fois incorporés, ils expliquaient 69% de la variation dans le recrutement du groupe 0. À d'autres sites de fraie, les conditions hydrographiques variables ne permettaient pas un développement normal et réussi des oeufs. Ainsi, des modèles relativement simples se sont avérés adéquats pour prédire le recrutement des morues du groupe 0 dans ces sites, ce qui laisse croire que des processus dominants abiotiques et biotiques peuvent être incorporés avec succès dans les modèles de recrutement.[Traduit par la Rédaction] Köster et al. 1556

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Survival and Abundance of Young Atlantic Cod (Gadus morhua) and Haddock (Melanogrammus aeglefinus) as Indicators of Year-class Strength

Cited by 61 publications

References 0 publications

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

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

Recruitment of Baltic cod and sprat stocks: identification of critical life stages and incorporation of environmental variability into stock-recruitment relationships

Developing Baltic cod recruitment models. II. Incorporation of environmental variability and species interaction

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