Working Group on Mixed Fisheries Advice



WGMIXFISHWGMIXFISHTrueClaire MooreFRSG11/12/2009 2:03:00 PMclaire.moore@Marine.ie446Working Group on Mixed Fisheries Advice

WGMIXFISH provides information for management advice and options which take into account the consequences of technical interactions in multistock, multigear fisheries. 

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​WGMIXFISH holds two meetings: The first meeting (WGMIXFISH-ADVICE) aims to produce ​mixed fishery projections according to tested methodology and relating these to each stock’s single-species advice. The second meeting (WGMIXFISH-METHODS) focuses on advances and additions to the methodology, e.g. new fleet behaviour or management target ‘scenarios’,  incorporation of uncertainty, or application to new management areas.

WGMIXFISH uses the Fcube approach (after Fleet and Fishery Forecast), a simple model of mixed fisheries which can be used to assess the consistency between management (TAC and/or effort) advice for species caught together, given the availability and accessibility of data. Currently, forecasts are performed for the North Sea region using weights of landings and discards and effort disaggregated by fleet and fishery. A simple linear relationship is assumed between effort and fishing mortality and status quo catchability assumed in the projections. Forecasts are produced according to scenarios for what limits the effort in each fleet and the forecasted catch of each species compared to the single species advice for TAC. Results are presented in a unique advice sheet, and those results relevant to each of the species covered are added to the single species advice sheets.

The Fcube model in its current form is appropriate for all regions where the majority of species of commercial interest are assessed quantitatively. Even so, expansion into new areas usually requires tailoring of the code to accommodate new species or unique characteristics of the fisheries. There are also many potential enhancements to the Fcube methodology, e.g. replacing the status quo catchability assumption with a model component that accounts for changes in fisher behaviour or technical measures, better addressing stocks lacking a full quantitative assessment, and accounting for uncertainty in factors such as stock-recruit relationship, etc. These issues are currently being addressed within WGMIXFISH.

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