Implementing Information on Stock Reproductive Potential in Fisheries Management: The Motivation, Challenges and Opportunities

Marshall, C. Tara

doi:10.1002/9781444312133.ch11

Cited by 40 publications

(58 citation statements)

References 87 publications

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“…with the stock structure within a population (e.g. Marshall, 2009;Marshall et al, 2006), and accordingly varies between years (e.g. Kennedy et al, 2007;Kjesbu et al, 1998;Ndjaula et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Fecundity regulation in relation to habitat utilisation of two sympatric flounder (Platichtys flesus) populations in the brackish water Baltic Sea

Nissling

Thorsén

Silva

2015

Journal of Sea Research

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Section: Discussionmentioning

confidence: 99%

Fecundity regulation in relation to habitat utilisation of two sympatric flounder (Platichtys flesus) populations in the brackish water Baltic Sea

Nissling

Thorsén

Silva

2015

Journal of Sea Research

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“…SSB is a gross estimate of reproductive potential that does not reflect changes in energy allocation or reproductive behavior that affect egg production (Marshall 2009). More importantly, estimates of SSB and R combine measurement and process error that are not taken into consideration in my analyses.…”

Section: Discussionmentioning

confidence: 99%

Reconsidering the impossible — linking environmental drivers to growth, mortality, and recruitment of fish

Pepin

2016

Can. J. Fish. Aquat. Sci.

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After a century of research into the drivers of early life (EL) growth and mortality, fisheries science has acquired limited capacity to predict future recruitment. A meta-analysis of stock assessment time series revealed that it may be difficult to identify stock-or environmental-recruitment drivers given limited variability in spawner biomass, recruitment, and survivorship in most populations. In nearly 50% of the stocks, there was limited information at low spawner biomass, limiting the reliability of fits to stock-recruitment models. Furthermore, variations in survivorship in 50% of year-classes resulted in less than a 2.5-fold change in recruitment. Simulations of three scenarios of change in EL growth and mortality rates demonstrated that they must covary positively to reproduce variations in survivorship consistent with observations. The potentially limited reliability of stock-recruitment relationships to predict year-class strength in many stocks and the low variability in survivorship in a large proportion of year-classes has important implications for the development of projections of stock productivity used in scientific advice. Furthermore, if a positive growth-mortality relationship underlies variations in survivorship, new research approaches are required to understand the trophic relationships that govern the dynamics of early life stages of fish and patterns of recruitment variability.Résumé : Après un siècle de recherche sur les facteurs qui agissent sur la croissance et la mortalité aux stades précoces de la vie (SPV), les sciences halieutiques ont acquis une capacité limitée de prédire le recrutement futur. Une méta-analyse de séries chronologiques d'évaluation des stocks révèle qu'il pourrait être difficile de cerner les facteurs de recrutement associés au stock ou au milieu étant donné la variabilité limitée de la biomasse, du recrutement et de la survie des géniteurs dans la plupart des populations. Pour presque 50 % des stocks, l'information associée à des situations de faible biomasse de géniteurs est limitée, ce qui limite la fiabilité du calage sur des modèles stock-recrutement. En outre, les variations de la survie dans 50 % des classes d'âge se traduisent par des variations du recrutement inférieures à un facteur de 2,5. Des simulations de trois scénarios de changement des taux de croissance et de mortalité aux SPV démontrent que ces taux doivent présenter une covariation positive pour produire des variations de la survie qui concordent avec les observations. La fiabilité potentiellement limitée des relations stock-recrutement pour ce qui est de prédire la force des classes d'âge dans de nombreux stocks et la faible variabilité de la survie dans une grande proportion de classes d'âge ont d'importantes conséquences pour l'élaboration de projections de la productivité des stocks utilisées pour formuler des avis scientifiques. En outre, si une relation croissance-mortalité positive sous-tend les variations de la survie, de nouvelles approches de recherche sont nécessaires pour...

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“…S6). The truncated age distributions commonly seen in heavily fished populations are known to negatively affect parental quality (47) and thereby recruitment success (48). If this holds true for the BS cod, positive changes in recruitment should become apparent in the near future as a consequence of the higher stock-age diversity (49).…”

Section: Temperature-driven Range Expansions and Bs Cod Population Sizementioning

confidence: 99%

Synergies between climate and management for Atlantic cod fisheries at high latitudes

Kjesbu¹,

Bogstad²,

Devine³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

182

189

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The widespread depletion of commercially exploited marine living resources is often seen as a general failure of management and results in criticism of contemporary management procedures. When populations show dramatic and positive changes in population size, this invariably leads to questions about whether favorable climatic conditions or good management (or both) were responsible. The Barents Sea cod (Gadus morhua) stock has recently increased markedly and the spawning stock biomass is now at an unprecedented high. We identify the crucial social and environmental factors that made this unique growth possible. The relationship between vital rates of Barents Sea cod stock productivity (recruitment, growth, and mortality) and environment is investigated, followed by simulations of population size under different management scenarios. We show that the recent sustained reduction in fishing mortality, facilitated by the implementation of a "harvest control rule," was essential to the increase in population size. Simulations show that a drastic reduction in fishing mortality has resulted in a doubling of the total population biomass compared with that expected under the former management regime. However, management alone was not solely responsible. We document that prevailing climate, operating through several mechanistic links, positively reinforced management actions. Heightened temperature resulted in an increase in the extent of the suitable feeding area for Barents Sea cod, likely offering a release from density-dependent effects (for example, food competition and cannibalism) through prolonged overlap with prey and improved adult stock productivity. Management and climate may thus interact to give a positive outlook for exploited high-latitude marine resources.gadoids | population dynamics | quota | ocean warming | polar displacement

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Implementing Information on Stock Reproductive Potential in Fisheries Management: The Motivation, Challenges and Opportunities

Cited by 40 publications

References 87 publications

Fecundity regulation in relation to habitat utilisation of two sympatric flounder (Platichtys flesus) populations in the brackish water Baltic Sea

Fecundity regulation in relation to habitat utilisation of two sympatric flounder (Platichtys flesus) populations in the brackish water Baltic Sea

Reconsidering the impossible — linking environmental drivers to growth, mortality, and recruitment of fish

Synergies between climate and management for Atlantic cod fisheries at high latitudes

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