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Stock-Recruit relationships in the F3 model

Stock-Recruit relationships in the F3 model. Bruce Kendall July 2006. Stock-Recruitment at the population scale. Questions. Does the SR relationship become clearer at smaller population scales? Is it the right relationship?

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Stock-Recruit relationships in the F3 model

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  1. Stock-Recruit relationships in the F3 model Bruce Kendall July 2006

  2. Stock-Recruitment at the population scale

  3. Questions • Does the SR relationship become clearer at smaller population scales? • Is it the right relationship? • Test using time series of stock and recruitment from an n-patch neighborhood for various n

  4. Systematic exploration of scale • Run model • Generate S & R time series for average densities in various neighborhoods of central patch • Estimate Ricker parameters at each scale • Repeat 100 times

  5. Parameter estimates depend systematically on sampling scale

  6. Questions, directions & discussion • What is the best metric to use for the “accuracy” of the SR assessment? • MSY, BMSY? • Fate of fishery if managed at est. BMSY? • How does pattern depend on • Dispersal parameters (width vs. distance of packets) • Biological parameters, type of DD • Harvest type • Temporal stochasticity

  7. What’s the point of pursuing this? • Show yet another reason why stock-recruitment relationships are hard (even with perfect data!) • Is there a way we can be more clever than simply using time series of cpue & catch? • Measures of productivity, larval settlement • What spatial scales, and how many sites?

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