Skip to main content

Review of Northeast Fishery Stock Assessments (1998) / Chapter Skim
Currently Skimming:

F. Extending Data Series and Alternative Projection Results for Gulf of Maine Cod
Pages 122-128

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.


From page 122...
... provide alternative evaluation of management strategies by using different recruitment scenarios. Extending Data Series Back In Time Task 2 was an investigation of whether the survey data before the period covered by the stock assessments could be used in conjunction with ADAPT stock assessment results to provide historical estimates of recruitment and spawning biomass.
Read the entire page →
From page 123...
... , which can take advantage of survey age composition data to extend the period without knowing the age composition of the commercial catch. 100,000 ~ 80,000 a lo EM 60,000 ._ c, 40,000 c, 20,000 0 fall, estimated q sprl, estimated q VPA-lyearolds midseason I ~ ~ /,~ .
Read the entire page →
From page 124...
... ~, ~ t~ ~ _ ~, ~, ,~ =\ _ ~ o~ ~ c~ ~ ~ ~ ~ ~ o~ _ _ _ _ _ _ ~ Year 00 00 00 G~ _ _ ~_ 00 c ~cr~ ~c~ _ _ _ _ FIGURE F1-C Georges Bank (GB) haddock 1-year olds from autumn and spring surveys and virtual population analysis (midseason)
Read the entire page →
From page 125...
... The alternative projections were stochastic so that probability distributions could be obtained. The first step in this analysis was to review the stock and recruitment data and Beverton-Hoft parameter estimates presented in the SARC Working Paper Gen 2.
Read the entire page →
From page 126...
... In most cases, these seemed to show evidence of a domed partial recruitment. Literal interpretation of the NMFS description would have led to taking simple averages of these age vectors over the specified period of years, as was done for the catch weights at age.
Read the entire page →
From page 127...
... # ~ # # # ~ ~- ~ ~~ 90 o 5,10~^ 15 ~20 ~23 ~ SSB (meted gong FEE F.2 Four rec~1nnent scenarios far Gulf of Maine cod based on original IFS VPA results 1983 tol996.
Read the entire page →
From page 128...
... , in which the consequences of alternative actions can be evaluated across different recruitment scenarios. To be even more useful in decisionmaking, such a table should be constructed using actual management tactics that could be employed to implement different target fishing mortalities rather than using the target fishing mortalities themselves.
Read the entire page →

Key Terms

  • spawning stock
  • stock biomass
  • population analysis
  • spring surveys
  • partial recruitment

  • maine cod
  • paper gen
  • virtual population
  • spawning biomass
  • stock assessments

  • georges bank
  • adapt results
  • age composition
  • assessment period
  • target fishing

  • spawning season
  • estimated partial
  • stock assessment
  • parameter estimates
  • fishing mortalities

  • fishing mortality
  • five stocks
  • projection results
  • commercial catch
  • initial projections

  • recruitment estimates
  • partial recruitments
  • period covered
  • nmfs adapt
  • adapt output


    • This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
    More information on Chapter Skim is available.