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Northeast Fisheries Science Center Reference Document 11-01

51st Northeast Regional Stock Assessment Workshop (51st SAW): Assessment Summary Report (2nd Edition)

Northeast Fisheries Science Center
Northeast Fisheries Science Center 166 Water Street, Woods Hole, MA 02543

Web version posted January 18, 2011

Citation: Northeast Fisheries Science Center. 2011. 51st Northeast Regional Stock Assessment Workshop (51st SAW) Assessment Report. US Dept Commer, Northeast Fish Sci Cent Ref Doc. 11-01; 70 p. Available from: National Marine Fisheries Service, 166 Water Street, Woods Hole, MA 02543-1026, or online at

Information Quality Act Compliance: In accordance with section 515 of Public Law 106-554, the Northeast Fisheries Science Center completed both technical and policy reviews for this report. These predissemination reviews are on file at the NEFSC Editorial Office.

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CORRECTION 1: The first edition of this report, released in January 2011, had some incorrect values in the silver hake, Loligo squid, and red hake chapters. On February 23, 2011 the report was corrected. The changes did not affect any conclusions about stock status that were given in the original report. For silver hake, the overfishing threshold for the southern area was changed from 52.30 kt/kg to 34.19 kt/kg. The wrong set of years was used in the calculation (1965 – 1974 instead of 1973 – 1982). For Loligo squid, the median biomass over the time series was changed from 25,578 mt to 27,578 mt, and the terminal year for that calculation was changed from 2009 to 2008. For red hake, the nominal discards in the southern area were corrected, which also required the catch and relative exploitation rate to be corrected in a table and figure.

CORRECTION 2: In August 2011 the report was corrected and released as a 2nd edition. The most recent changes do not affect any earlier conclusions about red hake stock status. In the “State of the Stock” section of the red hake chapter (paragraphs 3 and 4) the last sentence has been changed from “The exploitation index … for 2007-2009 … was below the threshold…” to “The exploitation index … for 2009 … was below the threshold…”. This text needed correction because: 1. the exploitation indices that were given were for one year (2009) and 2. relative F in the AIM analysis was based on one year. With this change there is now consistency in calculations between fishing rate and the recommended overfishing threshold used to determine overfishing status. Similar corrections are being made to the red hake Assessment Report CRD 11-02. Finally, analyses conducted after SARC51 by Dr. Paul Rago confirmed that for red hake AIM results based on one year indices had better AIM model diagnostics compared to the three-year smoothing approach.

Complete previous edition available in pdf here


Part A: Silver Hake Assessment Summary for 2010 Corrections made February 23, 2011.

Part B: Loligo Assessment Summary for 2010 Corrections made February 23, 2011.

Part C: Red Hake Assessment Summary for 2010Corrections made February 23, 2011 and August 12, 2011.

Part D: Offshore Hake Assessment Summary for 2010

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