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BY-CATCH AND DISCARDS OF THE EUROPEAN PURSE SEINE TUNA FISHERY IN THE INDIAN OCEAN.

BY-CATCH AND DISCARDS OF THE EUROPEAN PURSE SEINE TUNA FISHERY IN THE INDIAN OCEAN. CHARACTERISTICS AND ESTIMATION FOR THE 2003-2007 PERIOD.

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BY-CATCH AND DISCARDS OF THE EUROPEAN PURSE SEINE TUNA FISHERY IN THE INDIAN OCEAN.

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  1. BY-CATCH AND DISCARDS OF THE EUROPEAN PURSE SEINE TUNA FISHERY IN THE INDIAN OCEAN. CHARACTERISTICS AND ESTIMATION FOR THE 2003-2007 PERIOD

  2. AMANDE Justin Monin(1), ARIZ Javier (2), CHASSOT Emmanuel(3), CHAVANCE Pierre(3), DELGADO de Molina Alicia (2), GAERTNER Daniel(3), MUROA Hilario (4), PIANET Renaud (5), RUIZ Jon (4) 1) Centre de Recherches Océanologiques (CRO), Abidjan, Ivory Coast 2) Instituto Espanol de Oceanografia (IEO), Tenerife-Canary Island, Spain 3) Institut de Recherches pour le Développement (IRD), Centre de Recherche Halieutique Méditerranéenne et Tropicale (CRH), Sète, France 4) AZTI Tecnalia, Herrera Kaia, Portualde z :g, 20110, Pasaia (Gipuzkoa), Spain 5) Institut de Recherche pour le Développement (IRD) at Seychelles Fishing Authority (SFA), Victoria, Seychelles

  3. Introduction • Importance of bycatch and discards issues • Terminology • Tuna discards (major tunas and small tunas) • Bycatch (associated species discarded or valorized) • Objectives : • Estimation • Main characteritsics • Species composition • Length and sex structure • Utilisation

  4. Data and Methods (1 of 4) • Data Collection Regulation (Reg. 1543/2000 and 1639/2001) • France (IRD), Spain (AZTI, IEO) • 10 % coverage targeted • Methods (Observer programs) • Route and environment • Fishing operation • Tuna length structure tuna • Associated species biological and length characteristics • Floating device

  5. Data and Methods (2 of 2) • Spain started in 2003 and France in 2005 • Preparation of data. FAD, FSC, Msm (5 miles) • Extrapolation • Stratification • Quarter • Fishing mode (FAD, FSC, MSM) • Zone ET (“Echantillonnage thonier”) • Estimation for large groups of species (discarded tunas, billfishes, fishes, sharks, rays) • Confidence interval by re sampling method

  6. Results • Data coverage

  7. Results • Data coverage

  8. Data coverage

  9. Data coverage

  10. Extrapolation

  11. Total bycatch by species groups

  12. Extrapolation

  13. Extrapolation

  14. Extrapolation

  15. Total PS billfishes catch (tm)

  16. Species composition according to the fishing mode

  17. Total PS billfishes catch by species

  18. Black marlin size distribution

  19. Striped marlin size distribution

  20. Sailfishes size distribution

  21. Fate of caught billfishes

  22. Thank you

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