What question did this study set out to answer?

To evaluate and compare methods for estimating Schaefer model parameters from catch and effort data and to assess the effectiveness of alternative fishery control policies.

December 1, 1979Journal of the Fisheries Research Board of Canada

Comparison of Fisheries Control Systems That Utilize Catch and Effort Data

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Authors

RHRay HilbornParks Canada

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Implication

Simulation study demonstrates failure of common Schaefer estimation models in heavily exploited fisheries, suggesting equilibrium effort policies reduce catch variability compared to quotas.

Key Points

To evaluate and compare methods for estimating Schaefer model parameters from catch and effort data and to assess the effectiveness of alternative fishery control policies.
Simulated fishery dynamics to evaluate linear and nonlinear estimation methods for discretized Schaefer models alongside Schnute's method for continuous forms.
Assessed three harvest control strategies across various exploitation histories: feedback effort limitation, quota control for fixed escapement policies, and equilibrium effort application.
All estimation methods frequently failed to produce realistic Schaefer model parameters, resulting in poor harvest yields, especially for long-lived, low-productivity species.
Estimation failures were driven by insufficient contrast between fishing effort and catch per effort in the multiple regression analyses, particularly when data collection started after heavy exploitation.
Applying equilibrium effort provided lower catch variability without reducing average catch relative to fixed escapement, while quota control proved hazardous under high exploitation and parameter uncertainty.

Cite This Study

Ray Hilborn (1979) studied this question.

synapsesocial.com/papers/6a8317f05123f2a1809c8a68 https://doi.org/10.1139/f79-215

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Implication

Simulation study demonstrates failure of common Schaefer estimation models in heavily exploited fisheries, suggesting equilibrium effort policies reduce catch variability compared to quotas.

Comparison of Fisheries Control Systems That Utilize Catch and Effort Data

Discussion

Member takes

Implication

Key Points

Cite This Study

Comparison of Fisheries Control Systems That Utilize Catch and Effort Data

Discussion

Member takes

Implication

Key Points

Cite This Study

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Also Consider