Tropical Tunas Working Group Recife, April 2007
description
Transcript of Tropical Tunas Working Group Recife, April 2007
Tropical Tunas Working Group Recife, April 2007
Main topics studied Main topics studied
• Update of basic statistics, CAS and tagging database
• Estimation of landings that are directed out of the canning factories (“faux-poisson”)
• Review of new biological information and fishery indicators for YFT, BET and SKJ
• Indicators relevant to multi-species fisheries and ecosystems
• Recommendations
StatisticsStatistics
• Task 1 and 2: revisions following the work done in Sète (2006)
• Sizes: update and building of the CAS for YFT and SKJ
• Tagging: progress on improving the tropical tunas databases; still work to be done for YFT and SKJ by Secretariat and scientists
• Preparation of BET assessment: revision of the “fisheries” definition and data preparation for Multifan-CL analysis
« Faux-poisson »1- Total amount landed in Abidjan
« Faux-poisson »1- Total amount landed in Abidjan
« Faux poisson »2- Quantities according to the fleet
« Faux poisson »2- Quantities according to the fleet
% 'Faux Thon'
Tons % Tons % %Ghana and associated 10 556 58% 25 136 23% 42%France 2 424 13% 27 044 25% 9%Spain and associated 5 252 29% 56 124 52% 9%All fleets 18 231 100% 108 305 100% 17%
Average 2004-2006
Fleet'Faux Thons' Unloaded and
transshipped tuna
« Faux poisson »3- Species composition
« Faux poisson »3- Species composition
1997-1998 sampling 2004-2005 sampling
« Faux poisson »4- Size composition
« Faux poisson »4- Size composition
Major Tunas Minor Tunas
• These landings are quite important and should be taken in account for assessments
• Ways to avoid risks of double counting of catches (transshipments, observers) have to be axamined
• Studies to better estimate the species composition by fleet should be continued
• The way to take them in account in the statistics has still to be defined (discards, new category?)
« Faux poisson »5- Conclusion
« Faux poisson »5- Conclusion