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Jeff Isely SEFSC Miami

Effects of Catch-at-Age Sample Size on Gulf of Mexico Gray Triggerfish Spawning Stock Biomass Estimates. Jeff Isely SEFSC Miami. Data Inputs. H omogeneous stock structure

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Jeff Isely SEFSC Miami

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  1. Effects of Catch-at-Age Sample Sizeon Gulf of Mexico Gray Triggerfish Spawning Stock Biomass Estimates Jeff Isely SEFSC Miami

  2. Data Inputs • Homogeneous stock structure • Landings and indices calculated for eastern and western regions, but one population model constructed for entire Gulf of Mexico • Lorenzen mortality • Fixed growth curve • Estimated discards • Catch-at-age composition • Annual age-length keys • Estimated external to the model • SS3

  3. Data Inputs: Life HistoryAge and Growth Gray Triggerfish SEDAR 43 Growth Curve

  4. Data Inputs: Life HistoryAge and Growth • Large size at Age 0 • Few observations of small fish • Grow rapidly • Achieve maximum size at a young age • Little “recruitment signal” in length data • No fecundity – age relationship • Used length-based fecundity curve

  5. Model Configuration

  6. Data Inputs: LandingsRecreational

  7. Data Inputs: LandingsCommercial

  8. Data Inputs: DiscardsCommercial

  9. Data Inputs: DiscardsRecreational

  10. Data Inputs: DiscardsRecreational

  11. Data Inputs: DiscardsRecreational

  12. Data Inputs: Indices of AbundanceFishery Dependent • Recreational indices used guild approach to select trips that caught reef fish (as in SEDAR 9 Update).

  13. Data Inputs: Indices of AbundanceFishery Dependent • Commercial indices used guild approach to select trips that caught reef fish (as in SEDAR 9 Update). • Indices were adjusted for circle hook effect of 2.14

  14. Data Inputs: Indices of AbundanceFishery Independent

  15. AgeRecreational vs. CommercialIndividuals

  16. AgeRecreational vs. CommercialCatches Sampled

  17. AgeCommercial

  18. AgeRecreational

  19. LengthRecreational vs. CommercialIndividuals

  20. LengthRecreational vs. CommercialSamples

  21. LengthCommercial

  22. LengthRecreational

  23. Sample Size categories • Number of individuals measured (Length) • Number of trips sampled (Length) • Number of individuals aged (age) • Number of trips sampled (age) • Number - weighted by catch • Iterative reweighting of samples based on effective sample size • Number of individuals measured caped at 200

  24. Sample Size categories • Number of individuals measured (Length) • Number of trips sampled (Length) • Number of individuals aged (age) • Number of trips sampled (age) • Number - weighted by catch • Iterative reweighting of samples based on effective sample size • Number of individuals measured capped at 200

  25. Recreational

  26. Commercial

  27. Length Numbers

  28. Length Numbers

  29. SSB and Recruitment

  30. Length Samples

  31. Length Samples

  32. Capped Sample Size @ 200

  33. Capped Sample Size @ 200

  34. Catch Weighted

  35. Catch Weighted

  36. Iterative Reweighting

  37. Iterative Reweighting

  38. SSB/SSB0

  39. SSBB/SSB0

  40. SSB/SSB0

  41. SSB/SSB0

  42. Sample Size vs. Current SSB/SSB0

  43. Results

  44. Results

  45. Results

  46. Catch Weighted

  47. Catch Weighted

  48. Length Samples

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