Output MSE Comparison Examples under Various Commercial Legal Size Regulations

Essential Figures:

Section 1: Basic Comparison

  1. Total Catch
  2. Total SSB
  3. Catch for 20-Year Management
  4. Annual Catch for 20-Year Management
  5. Terminal SSB after 20-Year Management
  6. Lowest SSB during 20-Year Management
  7. Percentage to Green 20-Year Management
  8. General Performance Measures 20-Year Management
  9. Open Season Dead Discards 20-Year Management
  10. Open Season Dead Discards Annual Variation, 20-Year Management

Total Catch

The comparison of the median total catches during the projection period.

Essential Inputs

Legal Size for Commercial Fisheries

Scenario Comm 13in — legal size = 13 inch

Scenario Comm 13.5in — legal size = 13.5 inch

Scenario Comm 14in — legal size = 14 inch

Scenario Comm 14.5in — legal size = 14.5 inch

Scenario Comm 15in — legal size = 15 inch

  • Based on the 2016 Stock Assessment
  • Model Type: Stock Synthesis 3
  • Time Step: 1 year
  • Start Projection: 2016-01-01
  • Projection for 20 years (a generation)
  • Uncertainty is estimated from 100 iterations
  • Observational error for initial abundance: CV=0.2
  • Observational error for initial distribution: 1000 effective sample size
  • No mixing for adults between East and West stocks
  • The current natural mortality follows the Lorenzen curve
  • Fraction before spawning: 0.5 year
  • Observational error for recruitment ratio between East and West Stocks: 1000 effective sample size
  • One age-length key for both the East & West Stocks
    (The age-length key is inputs of the stock assessment model)
  • Biological Reference Points:
       SSBMSY  1230 trillion eggs
       FMSY  0.0588
  • Fishery Status: Green
  • CVs for Release Mortality (Log-normal Distribution): 0.05
  • Use default seeds in the format of a csv file
  • The recruitment is estimated from the Beverton-Holt model, from the latest stock assessment
  • The natural mortality is estimated from the latest stock assessment
  • Constant-F harvest control rule with F is 75% of the FMSY
  • The Recreational Sector takes 49% of the total catch quota
  • The Federal For-hire Component takes 42.3% of the recreational catch
  • The Probability of Overfishing is set at 40%
  • Commercial ACT buffer: 0%, Federal For-hire ACT buffer: 9%; Private angling ACT buffer: 20%
  • Current recreational legal size and bag limit regulations are adopted
  • The Release mortality is estimated from the latest stock assessment
  • Catch rates are estimated according to the 2018-2019 observations
  • The Penalty will be applied if the actual landing exceeds ACT, but no carryover
  • Private angling quota among States are: AL 26.3%, FL 44.82%, LA 19.12%, MS 3.55% and TX 6.21%

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You can also evaluate the effect of using different allocations for Commercial and Recreational Sectors, click here.

Other Detailed Figures:

Section 2: Sector Comparison

  1. Commercial Catch
  2. For-hire Catch
  3. Private Angling Catch
  4. Total SSB, Ave of First 5-Year
  5. Total SSB, Ave of Last 5-Year
  6. Catches for Federal For-hire and Private Angling Sectors in the First and Last 5 Years
  7. State Private Angling Catch, Ave of First 5-Year
  8. State Private Angling Catch, Ave of Last 5-Year
  9. State Private Angling Season Length, Ave of First 5-Year
  10. State Private Angling Season Length, Ave of Last 5-Year
  11. Total Catch, Ave of First 5-Year
  12. Total Catch, Ave of Last 5-Year
  13. Commercial Dead Discards
  14. Recreational Dead Discards

Section 3: Comparison between and within Sectors

  1. Performance Measures within the Commercial Sector
  2. Performance Measures within the Recreational Sector