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Gulf of Maine/Georges Bank Atlantic Herring Assessment Update – 2009.

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Presentation on theme: "Gulf of Maine/Georges Bank Atlantic Herring Assessment Update – 2009."— Presentation transcript:

1 Gulf of Maine/Georges Bank Atlantic Herring Assessment Update – 2009

2 Original landings series for TRAC 2006 assessment

3 Revised landings series for TRAC 2009 assessment

4 Catch estimates (number) Atlantic herring – TRAC 2009

5 Atlantic herring landings (number) by country – TRAC 2009

6 Gulf of Maine/Georges Bank Catch at Age: 2005-2008 Atlantic herring – TRAC 2009

7 + 95% CI

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11 ASAP model (from 2006 assessment) CAA ages 2- 6+ NMFS surveys –winter, spring, fall, acoustic Split index series 1984-1985 Fishery selectivity 1.0 ages 2-6+ M=0.2 Changes: Total biomass calculated as # at age * Jan 1 wt at age (rather than mid-year) SSB calculated for a fall spawning

12 Atlantic herring – TRAC 2009

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19 ASAP Final 2009 model CAA ages 2- 6+ NMFS surveys –spring, fall Split index series 1984-1985 Fishery selectivity fixed at 1.0 ages 2-6+ M=0.2 Total biomass calculated as # at age * Jan 1 wt at age SSB calculated for a fall spawning

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28 Final 2009 Atlantic herring – TRAC 2009

29 Final 2009 Atlantic herring – TRAC 2009

30 Final 2009 Atlantic herring – TRAC 2009

31 Stock Number Age 2 Final 2009

32 Stock Number Age 6+ Final 2009

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36 Median F + 95% CI from Final model TRAC 2009

37 Median SSB + 95% CI Final model TRAC 2009

38 Fishing mortality: model variation compared to retrospective variation

39 SSB: model variation compared to retrospective variation

40 Atlantic herring – TRAC 2009 F status quo

41 Atlantic herring – TRAC 2009

42 F status quo Atlantic herring – TRAC 2009

43 Projections at F status quo

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45 Median (+ 1 std) of total age 2+ biomass 30 year projection at Fmsy=0.27


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