Impact of Directed Sardine Fishery on Resource Assessment Results
Explore the impact of directed sardine fishery on resource assessment results from 1984 to 2015. Compare the resource under normal fishery conditions to a scenario with no directed sardine fishery. Analyze spawning biomass, recruitment, and total biomass trends to estimate the potential outcomes.
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Presentation Transcript
MARAM/IWS/2017/Sardine/P8 Sardine assessment results compared to a run which excludes the directed sardine catch, 1984 - 2015
What is the impact of the fishery on the resource? What would the resource look like today if, since 1984, there had been no directed sardine fishery? The assessment provides a basis to estimate this.
Catch run of the model since 1984: The assessment as is, at the MLE mode, run from 1984 2015. No directed catch : A run of the assessment model, using the MLE parameter values, but setting directed sardine catches to zero.
Clarification of no directed catch, and the same set of parameter values . No directed catch : The only catches that are retained are those related to anchovy catches. The same set of parameter values .
Recruitment and spawning biomass: Recruitment is a function of spawning biomass and random shocks . Spawning biomass will differ between Catch and No directed catch . The random shocks are estimates of other impacts on recruitment (environmental), these are included in the set of model parameters that are held the same between the two runs Catch and No directed catch .
