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Diffuse Priors in XDB-SRA for Brown, China, and Copper Rockfish Biomass Estimation

This study explores the implementation of diffuse priors within the XDB-SRA (Statistical Catch-at-Age) framework, focusing on the biomass estimation of various rockfish species, including Brown, China, and Copper Rockfish. Using catch-based methods, we adopt informative priors for Fmsy/M and Bmsy/B0. The methodology involves adjustments of prior distributions, sensitivity analyses, and posterior predictive distributions, allowing for effective relative targets and thresholds assessment. The findings contribute to better understanding the fishery dynamics in California's coastal regions.

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Diffuse Priors in XDB-SRA for Brown, China, and Copper Rockfish Biomass Estimation

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  1. Diffuse Priors for Base Models • DB-SRA priors for Fmsy/M and Bmsy/B0 are somewhat informative (catch-based method) • For XDB-SRA, adopted ‘diffuse’ Fmsy/M prior based on Zhou et al. (2011); mean=0.97, logSD=0.46 • Tripled SD of prior for Bmsy/B0 (0.5 to 1.5); mean=0.4

  2. XDB-SRA:Brown Rockfish

  3. Brown Rockfish Catch History

  4. Brown, XDB-SRA Spawning biomass quantiles, relative totarget & limit (left) and catch-based prior (right)

  5. Brown, XDB-SRA Exploitation rate and biomass,relative to targets/thresholds

  6. Brown, XDB-SRA Reference Points

  7. Brown, XDB-SRA Indices of Abundance,rescaled to biomass units with median q 1: Central CA onboard CPFV 2: Southern CA onboard CPFV 3: CA RecFIN

  8. Brown, XDB-SRA Posterior Predictive Distributions 1: Central CA onboard CPFV 2: Southern CA onboard CPFV 3: CA RecFIN

  9. Brown, XDB-SRA Posterior Predictive Biomass 1: Central CA onboard CPFV 2: Southern CA onboard CPFV 3: CA RecFIN

  10. Brown, XDB-SRA Brown Rockfish Posteriors vs. Priors

  11. Brown, XDB-SRA Posterior UpdateXDB-SRA w/ diffuse priors

  12. Brown, XDB-SRA Pairwise Posterior Scatterplots

  13. Brown, XDB-SRA Sensitivity Analysesmedian (5% - 95%)

  14. XDB-SRA:China Rockfish, Central

  15. China Rockfish Catch History

  16. China Central, XDB-SRA Spawning biomass quantiles, compared totarget & limit (left) and catch-based prior (right)

  17. China Central, XDB-SRA Exploitation rate and biomass,relative to targets/thresholds

  18. China Central, XDB-SRA Reference Points

  19. China Central, XDB-SRA Indices of Abundance,rescaled to biomass units with median q 1: Central CA RecFIN 2: Central CA onboard CPFV

  20. China Central, XDB-SRA Posterior Predictive Distributions 1: Central CA RecFIN 2: Central CA onboard CPFV

  21. China Central, XDB-SRA Posterior Predictive Biomass 1: Central CA RecFIN 2: Central CA onboard CPFV

  22. China Central, XDB-SRA China (Central) Posteriors vs. Priors

  23. China Central, XDB-SRA Posterior UpdateXDB-SRA w/ diffuse priors

  24. China Central, XDB-SRA Pairwise Posterior Scatterplots

  25. China Central, XDB-SRA Sensitivity Analysesmedian (5% - 95%)

  26. XDB-SRA:China Rockfish, North

  27. China Rockfish Catch History

  28. China North, XDB-SRA Spawning biomass quantiles, compared totarget & limit (left) and catch-based prior (right)

  29. China North, XDB-SRA Exploitation rate and biomass,relative to targets/thresholds

  30. China North, XDB-SRA Reference Points

  31. China North, XDB-SRA Indices of Abundance,rescaled to biomass units with median q 1: Northern CA and OR, RecFIN 2: Northern CA and OR, onboard CPFV

  32. China North, XDB-SRA Posterior Predictive Distributions 1: Northern CA and OR, RecFIN 2: Northern CA and OR, onboard CPFV

  33. China North, XDB-SRA Posterior Predictive Biomass 1: Northern CA and OR, RecFIN 2: Northern CA and OR, onboard CPFV

  34. China North, XDB-SRA China (North) Posteriors vs. Priors

  35. China North, XDB-SRA Posterior UpdateXDB-SRA w/ diffuse priors

  36. China North, XDB-SRA Pairwise Posterior Scatterplots

  37. China North, XDB-SRA Sensitivity Analysesmedian (5% - 95%)

  38. XDB-SRA:Copper Rockfish

  39. Copper Rockfish Catch History

  40. Copper, XDB-SRA Spawning biomass quantiles, compared totarget & limit (left) and catch-based prior (right)

  41. Copper, XDB-SRA Exploitation rate and biomass,relative to targets/thresholds

  42. Copper, XDB-SRA Reference Points

  43. Copper, XDB-SRA Indices of Abundance,rescaled to biomass units with median q 1: Central CA , onboard CPFV 2: Coastwide, RecFIN 3: Southern CA, onboard CPFV 4: No. CA / OR, onboard CPFV

  44. Copper, XDB-SRA Posterior Predictive Distributions 1: Central CA , onboard CPFV 2: Coastwide, RecFIN 3: Southern CA, onboard CPFV 4: No. CA / OR, onboard CPFV

  45. Copper, XDB-SRA Posterior Predictive Biomass 1: Central CA , onboard CPFV 2: Coastwide, RecFIN 3: Southern CA, onboard CPFV 4: No. CA / OR, onboard CPFV

  46. Copper, XDB-SRA Copper Posteriors vs. Priors

  47. Copper, XDB-SRA Posterior UpdateXDB-SRA w/ diffuse priors

  48. Copper, XDB-SRA Pairwise Posterior Scatterplots

  49. Copper, XDB-SRA Sensitivity Analysesmedian (5% - 95%)

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