Exploitation of Multiple Stocks by a Common Fishery

Paulik, G. J.; Hourston, A. S.; Larkin, Peter

doi:10.1139/f67-202

Cited by 56 publications

(15 citation statements)

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“…This approach has been used since computers were first available to fisheries scientists. Figure 14.5 shows such a calculation for three stocks of Pacific salmon from Paulik et al (1967).…”

Section: Equilibrium Yield From Several Stocks Harvested Jointlymentioning

confidence: 99%

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Quantitative Fisheries Stock Assessment

Hilborn¹,

Walters²

1992

2,268

826

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“…This approach has been used since computers were first available to fisheries scientists. Figure 14.5 shows such a calculation for three stocks of Pacific salmon from Paulik et al (1967).…”

Section: Equilibrium Yield From Several Stocks Harvested Jointlymentioning

confidence: 99%

“…Total equilibrium catch at various rates of exploitation in a hypothetical fishery on three mixed stocks. Redrawn from Paulik et al 1967. larger the random variability of the stocks, the more yield is foregone by a mixed-stock fishery.…”

Section: /Estimation Of Parametersmentioning

confidence: 99%

Quantitative Fisheries Stock Assessment

Hilborn¹,

Walters²

1992

2,268

826

View full text Add to dashboard Cite

show abstract

“…From a management perspective, single-stock focus disregards technical interactions in fisheries, where 2 or more stocks are captured jointly, possibly leading to greater risk of overharvesting less productive stocks or differential recovery rates following harvesting restrictions (e.g. Paulik et al 1967, Vinther et al 2004, Murawski 2010. It also does not take full advantage of the potentially greater simplicity of stock-aggregate management and possible greater interannual predictability of the total amount of catch in mixed-stock fisheries (e.g.…”

Section: Introductionmentioning

confidence: 99%

Assembly rules for aggregate-species production models: simulations in support of management strategy evaluation

Gaichas¹,

Gamble²,

Fogarty³

et al. 2012

Mar. Ecol. Prog. Ser.

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Ecosystem-based fisheries management (EBFM) emphasizes sustainability at multiple levels of organization beyond single target species. Therefore, biological reference points (BRPs) for aggregated groups are required, which optimize yields while preventing overexploitation of individual species. We evaluate the tradeoffs between yield and biodiversity objectives for a wide range of aggregation strategies using multispecies surplus production models and comparing 2 simulated fish communities. We simulated population trajectories with an operating model detailing predation and competitive interactions for all individual species within each community, and with additional stochastic environmental variability for one community. Species trajectories were then aggregated by functional feeding guild, taxonomy, habitat association, size class, and at the entire community level. We estimated production parameters and BRPs (e.g. maximum sustainable yield, MSY) using a simple assessment model applied to each aggregated time series, then we applied the MSY fishing rates to each simulated community as alternative fishing strategies and compared equilibrium biomass and yield under each strategy. We were able to define multi-species reference points to meet both yield and biodiversity objectives across full system, taxonomic, habitat, feeding, and size-based aggregations. Species complexes were best able to meet both objectives when species with broadly similar productivity, environmental sensitivity and species interactions were aggregated into the complex. The impacts of simulated environmental variability on BRPs were substantial for certain species and aggregates, so including the combined impacts of environmental variation and species interactions in precautionary reference points appears critical to EBFM.

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“…The theory of management and maximization of sustainable yield from mixed-stock fisheries has received ongoing consideration from Ricker (1958b), through Paulik et al (1967), Hilborn (1976), and Collie et al (1990) to the recent renaissance of exploration -e.g., Matsuda and Abrams (2006), Matsuda et al (2008), Kar and Ghosh (2013), Jacobsen et al (2014). The problem occurs when two (or more) stocks being jointly harvested have different optimum exploitation rates.…”

Section: Multiple Species Caught In the Same Fishing Gearmentioning

confidence: 99%

When is a fishery sustainable?

Hilborn

Fulton

Green

et al. 2015

Can. J. Fish. Aquat. Sci.

120

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Despite the many scientific and public discussions on the sustainability of fisheries, there are still great differences in both perception and definition of the concept. Most authors now suggest that sustainability is best defined as the ability to sustain goods and services to human society, with social and economic factors to be considered along with environmental impacts. The result has been that each group (scientists, economists, non-governmental organizations (NGOs), etc.) defines "sustainable seafood" using whatever criteria it considers most important, and the same fish product may be deemed sustainable by one group and totally unsustainable by another one. We contend, however, that there is now extensive evidence that an ecological focus alone does not guarantee long-term sustainability of any form and that seafood sustainability must consistently take on a socio-ecological perspective if it is to be effective across cultures and in the future. The sustainability of seafood production depends not on the abundance of a fish stock, but on the ability of the fishery management system to adjust fishing pressure to appropriate levels. While there are scientific standards to judge the sustainability of food production, once we examine ecological, social, and economic aspects of sustainability, there is no unique scientific standard.Résumé : Malgré les nombreuses discussions scientifiques et publiques sur la durabilité des pêches, de grandes différences persistent quant à la perception et à la définition de ce concept. La plupart des auteurs suggèrent actuellement que la meilleure définition de la durabilité est la capacité de maintenir des biens et services pour la société humaine, en tenant compte de facteurs sociaux et économiques, ainsi que des impacts sur l'environnement. Il en découle que chaque groupe (scientifiques, écono-mistes, ONG (les organisations nongouvernementales), etc.) définit les « poissons et fruits de mer durables » sur la base des critères qu'il juge les plus importants, et un produit donné peut être jugé durable par un groupe, alors qu'un autre groupe estime qu'il n'est pas du tout durable. Nous soutenons toutefois qu'il existe une vaste preuve à l'effet qu'une seule optique écologique ne garantit aucune forme de durabilité à long terme, et que la durabilité des poissons et fruits de mer doit uniformément reposer sur une perspective socioécologique pour constituer un concept efficace pour l'avenir, peu importe la culture. La durabilité de la production de poissons et fruits de mer dépend non pas de l'abondance d'un stock de poissons, mais de la capacité du système de gestion des pêches à ajuster la pression de pêche aux bons niveaux. S'il existe des normes scientifiques pour juger de la durabilité de la production alimentaire, il n'y a pas de norme scientifique unique pour l'évaluation des aspects écologiques, sociaux et économiques de la durabilité. [Traduit par la Rédaction]

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Exploitation of Multiple Stocks by a Common Fishery

Cited by 56 publications

References 0 publications

Quantitative Fisheries Stock Assessment

Quantitative Fisheries Stock Assessment

Assembly rules for aggregate-species production models: simulations in support of management strategy evaluation

When is a fishery sustainable?

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