“Fish stocks and recruitment”: the past thirty years

Rothschild, Brian J.

doi:10.1006/jmsc.2000.0645

Cited by 88 publications

(56 citation statements)

References 11 publications

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“…Understanding the effects of environment on recruitment is difficult but necessary, given that we can thereby improve the knowledge of the relationships between spawning stock and recruitment (see Shepherd et al, 1984). These relationships are complex and according to Rothschild (1991Rothschild ( , 2000, the complexity lies in the high dimensional environment and in the non-linear population dynamics response. To circumvent this difficulty it is necessary to understand the physicalbiological and the spatial-temporal species dynamics of the different ecosystems of the ocean.…”

Section: Regime Shiftsmentioning

confidence: 99%

Sardine regime shifts off Portugal: a time series analysis of catches and wind conditions

Borges¹,

Santos²,

Crato³

et al. 2003

Sci. Mar.

104

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SUMMARY: Decadal changes have been observed in the annual catch of sardine (Sardina pilchardus W). Long-term changes have also been observed in alongshore winds off Portugal in the last decades in winter months. During sardine spawning season (winter), northerly winds that favour upwelling led to unfavourable conditions for egg and larval survival. By using time series analysis, we investigated the effect of wind conditions and North Atlantic Oscillation (NAO) on the sardine catches, in the period from 1946-1991. We also investigated the time lag between recruitment strength and its turnout in catches. We concluded that recruitment is forced to a lower level when the frequency and intensity of northerly wind exceeds a certain limit in winter. Our time series retrospective analyses led to evidence of climatic driven regime-shifts in West Portugal sardine productivity in late 1960s-early 1970s. These results are discussed in terms of their implications in fisheries management plans.

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Section: Regime Shiftsmentioning

confidence: 99%

Sardine regime shifts off Portugal: a time series analysis of catches and wind conditions

Borges¹,

Santos²,

Crato³

et al. 2003

Sci. Mar.

104

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“…Hjort 1914;Rothschild 1986Rothschild , 2000Chambers and Trippel 1997;Houde 2002). The early ontogenetic stages, i.e.…”

Section: Introductionmentioning

confidence: 99%

The influence of temperature on the development of Baltic Sea sprat (Sprattus sprattus) eggs and yolk sac larvae

et al. 2008

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In spring 2004 and 2005 we performed two sets of experiments with Baltic sprat (Sprattus sprattus balticus Schneider) eggs and larvae from the Bornholm Basin simulating ten different temperature scenarios. The goal of the present study was to analyse and parameterise temperature effects on the duration of developmental stages, on the timing of important ontogenetic transitions, growth during the yolk sac phase as well as on the survival success of eggs and early larval stages. Egg development and hatching showed exponential temperature dependence. No hatching was observed above 14.7°C and hatching success was significantly reduced below 3.4°C. Time to eye pigmentation, as a proxy for mouth gape opening, decreased with increasing temperatures from 17 days post hatch at 3.4°C to 7 days at 13°C whereas the larval yolk sac phase was shortened from 20 to 10 days at 3.8 and 10°C respectively. Maximum survival duration of non-fed larvae was 25 days at 6.8°C. Comparing the experimental results of Baltic sprat with existing information on sprat from the English Channel and North Sea differences were detected in egg development rate, thermal adaptation and in yolk sac depletion rate (YSDR). Sprat eggs from the English Channel showed significantly faster development and the potential to develop at temperatures higher than 14.7°C.North Sea sprat larvae were found to have a lower YSDR compared to larvae from the Baltic Sea. In light of the predictions for global warming, Baltic sprat stocks could experience improved conditions for egg development and survival.

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“…Our approach attempts to follow the success of a year-class during ontogeny from spawner abundance through the egg and larval to the juvenile stage according to Paulik's (1973) framework for examining the entire life history process, a concept broadly accepted but not really implemented yet (Rothschild 2000).…”

Section: Introductionmentioning

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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“Fish stocks and recruitment”: the past thirty years

Cited by 88 publications

References 11 publications

Sardine regime shifts off Portugal: a time series analysis of catches and wind conditions

Sardine regime shifts off Portugal: a time series analysis of catches and wind conditions

The influence of temperature on the development of Baltic Sea sprat (Sprattus sprattus) eggs and yolk sac larvae

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

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