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2008 Billfish Workplan SCI-052 / 2007

2008 Billfish Workplan SCI-052 / 2007. Summary. Improvements of basic catch and cpue statistics for other billfish, with a focus on artisanal landings Development of methods to better interpret the historical changes in CPUE from longline data.

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2008 Billfish Workplan SCI-052 / 2007

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  1. 2008 Billfish WorkplanSCI-052 / 2007

  2. Summary • Improvements of basic catch and cpue statistics for other billfish, with a focus on artisanal landings • Development of methods to better interpret the historical changes in CPUE from longline data. • Work on age, growth and reproduction to provide a comprehensive view of spawning and growth patterns for all billfish stocks.

  3. Summary (cont.) • Conduct the next assessment of sailfish through a two stage process: • Hold a data preparatory meeting in the first half of 2008 to produce : • Estimates of sailfish catches • Estimate catch of all fleets, including filling gaps were catch is know to be underreported • split away any spearfish reported as sailfish • Split away any sailfish reported as billfish unclassified. • Relative abundance indices • Review sailfish biology • Have a full assessment of eastern and western stocks of sailfish in 2009.

  4. Biological studies • Complete estimation of age and growth for blue marlin and white marlin • Refocus reproduction, age and growth studies towards sailfish and spearfish. • Continue and expand the analysis of tissue samples of white marlin and spearfish to evaluate the presence of round scale spearfish in the western Atlantic. • Continue the program that aims to describe vertical distribution and habitat of billfish. • Continue conventional tagging activities focusing more in the south Atlantic and Eastern Atlantic by attempting to restart conventional tagging in the Cote d’Ivoire recreational fishery.

  5. Improvement of catch data • Coordination of a review of billfish catches and the design of a monitoring program in the eastern Caribbean with the FAO-WECAFC ad hoc group on moored FADs. • Collaboration with the ICCAT tropical tuna working group to estimate the historical by-catch of billfish from purse seine fisheries in West Africa and its landings as part of the FAUX POISSON mix. • Support the improvement of sampling programs for artisanal fisheries, specially in West Africa.

  6. Sailfish data meeting • Estimates of sailfish catches • Relative abundance indices • Review sailfish biology

  7. Update estimates of catch for all components of the directed and bycatch fisheries with an emphasis of the main sources of historic harvest: • Bycatch from industrial longlines fleets • Bycatch from tropical purse seine • Artisanal gillnet • Artisanal FAD fleets • Recreational • Estimates of live releases for all fleets

  8. Update relative abundance estimates for fleets for which previous estimates were obtained • US Longline • US Rod and Reel • Japanese Longline (by stock) • Chinese Taipei Longline (by stock) • Venezuelan Longline

  9. Obtain relative abundance indices for other important fleets • Artisanal gillnet • Cote d’ivoire • Ghana • Senegal • Venezuela • Sao Tome • Brazilian longline

  10. Review biological information available with an emphasis on: • Habitat utilization • Growth and ageing • Reproduction and fecundity • Migration • Survival

  11. Where will the meeting be held ?

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