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Review of Northeast Fishery Stock Assessments (1998) / Chapter Skim
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Review of Details of Northeast Groundfish Stock Assessments
Pages 61-68

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From page 61...
... Henry David Thoreau This chapter contains detailed technical comments about the stock assessment process. Although incorporating the suggestions contained in this chapter would improve assessments, the committee believes that the current assessments are still valid for making management decisions.
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From page 62...
... Most Canadian fisheries have a total allowable catch specified, but their enforcement system may adequately deal with misreporting. Observer Program Apparently, information obtained by independent observers aboard fishing vessels is minimal at best; few trips have been observed in recent years.
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From page 63...
... 9 8 o ~ 6 ~ 5 o Em ~L, 4 ~., Ad) A ·_ ;^ 2 1 o t~ 1996 Spring Index ·Single tow with large catch excluded 0 1 2 3 4 5 6 Age Group 9+ FIGURE 3.1 Mean number of haddock per tow at age captured in the Georges Bank strata sets (offshore strata 01 130-1250, 01290-01300)
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From page 64...
... A part of future stock assessments should be an evaluation of sample size requirements for ageing to meet specified precision and accuracy goals in stock assessment outputs such as biomass and fishing mortality estimates. Recreational Sampling The primary source of marine recreational data for the New England region and the nation is the Marine Recreational Fisheries Statistics Survey (MRFSS)
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From page 65...
... Only two ofthe New England groundfish stocks have appreciable recreational catches: Gulf of Maine Georges Bank cod. Recreational catches are incorporated into these assessments but are sufficiently precise to be useful.
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From page 66...
... The use of alternative methods and data sources will strengthen the advice based on these assessments. More elaborate consideration of stock assessment models and their role in fishery management is contained in the National Research Council report Improving Fish Stock Assessments (NRC, 1998~.
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From page 67...
... assumptions will become particularly important in future years if the current low fishing mortalities continue to prevail. Alternative assessment methods should be used to consider the effects of including variability of catch data (through a formal statistical model)
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From page 68...
... Specifically, because no effort data after 1994 are used in present assessments, to compare the actual number of days at sea or other effort restrictions on the fishing mortality being inflicted on various stocks would be useful. At the same time, the results of the stock assessment should be compared with qualitative information available from the fleets.
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Key Terms

  • georges bank
  • stock assessments
  • recreational catch
  • fishing mortality
  • age samples

  • catch rates
  • natural mortality
  • cpue series
  • formal statistical
  • survey indices

  • assessment models
  • allowable catch
  • total catch
  • fishing vessels
  • catch data

  • groundfish stocks
  • bank haddock
  • recreational fisheries
  • fish stock
  • accurate information

  • total allowable
  • effort data
  • lognormal distribution
  • coastal states
  • five stocks

  • stock sizes
  • logbook data
  • age composition
  • statistical tests
  • time lag


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