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

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Presentation transcript:

Effects of Catch-at-Age Sample Size on Gulf of Mexico Gray Triggerfish Spawning Stock Biomass Estimates Jeff Isely SEFSC Miami

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

Data Inputs: Life History Age and Growth Gray Triggerfish SEDAR 43 Growth Curve

Data Inputs: Life History Age 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

Model Configuration

Data Inputs: Landings Recreational

Data Inputs: Landings Commercial

Data Inputs: Discards Commercial

Data Inputs: Discards Recreational

Data Inputs: Discards Recreational

Data Inputs: Discards Recreational

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

Data Inputs: Indices of Abundance Fishery 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 Guild approach selects trips based on the catch composition containing species that belong to the reef fish assemblage, as is now the accepted treatment for developing standardized CPUE indices for the recreational sectors.

Data Inputs: Indices of Abundance Fishery Independent Same standardization methodology was used as applied during SEDAR 9 Update

Age Recreational vs. Commercial Individuals

Age Recreational vs. Commercial Catches Sampled

Age Commercial

Age Recreational

Length Recreational vs. Commercial Individuals

Length Recreational vs. Commercial Samples

Length Commercial

Length Recreational

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

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

Recreational

Commercial

Length Numbers

Length Numbers

SSB and Recruitment

Length Samples

Length Samples

Capped Sample Size @ 200

Capped Sample Size @ 200

Catch Weighted

Catch Weighted

Iterative Reweighting

Iterative Reweighting

SSB/SSB0

SSBB/SSB0

SSB/SSB0

SSB/SSB0

Sample Size vs. Current SSB/SSB0

Results

Results

Results

Catch Weighted

Catch Weighted

Length Samples

Length Numbers

Iterative Reweighting

Capped @ 200

Results

Fits to Rec-E Indices Rec East Headboat East

Fits to Rec-W Indices Headboat West No Rec west. It was rejected in SEDAR 9 as too volatile.

Fits to COM Indices

Fits to Age Comp: Rec East

Fits to Age Comp Rec West

Fits to Age Comp: Com-East

Fits to Age Comp: Com-West

Fleet Selectivity

Retention Rec-E Period 1: pre LL set at 6 inches Period 2: 12 inch LL Period 3: 14 inch LL Assume “near” knife-edge selection

Spawner-Recruit Relationship Open circles – Observed Solid line – estimated Green line – corrected

SSB and Recruitment

Results

Average Age and Length