B. GEORGES BANK ATLANTIC COD ASSESSMENT SUMMARY FOR 2012 State of Stock: The Georges Bank cod stock is overfished and overfishing is occurring (Figure
B1). Spawning stock biomass (SSB) in 2011 is estimated to be 13,216 mt which is 7 % of the SSBmsy (186,535 mt) (Figure B1). The 2011 fully recruited fishing mortality (ages 5+) is estimated to be 0.43 which is more than twice as high as the Fmsy (0.18) (Figure B1). This benchmark assessment is based...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.386.4567 http://www.nefsc.noaa.gov/publications/crd/crd1301/partb.pdf |
| Summary: | B1). Spawning stock biomass (SSB) in 2011 is estimated to be 13,216 mt which is 7 % of the SSBmsy (186,535 mt) (Figure B1). The 2011 fully recruited fishing mortality (ages 5+) is estimated to be 0.43 which is more than twice as high as the Fmsy (0.18) (Figure B1). This benchmark assessment is based on a newly formulated model (see Data and Assessment section below). The assessment model exhibits a strong retrospective pattern (tending to overestimate SSB and underestimate F) which was corrected for when providing the estimates of SSB and F for 2011, stock status and projection starting points. Projections: Short term projections (3-years) of catch and SSB were made under an assumption of F = 0.75*FMSY Proxy (Table B1). Based on the recommendations of the GARM III Panel (O’Brien et al. 2008) and reviewed by the SAW 55 WG, recruitment is estimated from one of two distributions based upon the magnitude of SSB. Recruitment is generally lower when SSB is less than 50,000 mt. Thus the 1978-2011 ASAP estimated age-1 fish recruitment is separated into two distributions based on the SSB breakpoint of 50,000 mt. Recruitment is estimated from the low recruitment distribution when SSB is < 50,000 mt or from the high recruitment distribution when SSB> 50,000 mt (Figure B2). |
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