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A report of the 19th Northeast Regional Stock Assessment Workshop : a preliminary analytical assessment for white hake in the Georges Bank-Gulf of Maine region
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1998
[PDF-2.59 MB]
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Alternative Title:Preliminary analytical assessment for white hake in the Georges Bank-Gulf of Maine region
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Description:White hake are distributed on the continental shelf from the Gulf of St. Lawrence to North Carolina. Landings increased from a low of 1100 mt in the late 1960s to a high of 9500 mt in 1992. The majority of the landings are in NAFO areas 5 and 6 and have been taken by US vessels. Sink gill nets and otter trawls are the dominant gear used to land white hake in the second and third quarters of the year. Recreational catches are insignificant. Discards are believed to occur in large quantities in both the otter trawl and the sink gill net fisheries. The length compositions from both the port and sea sampling databases indicate that fish < 40 cm are usually not landed and that the length mode of landings is 60 cm. Landings per unit effort (LPUE), calculated using all commercial otter trawl trips landing white hake, has been stable since 1980. The research vessel abundance and biomass indices tend to agree with the first LPUE index. Total mortality (Z) estimates derived from the NEFSC survey data for 1987- 1989 ranged from 0.9 and 1.3. Analyses of 1985-1993 data using a modified DeLury model indicate that fishing mortality has been increasing while stock biomass has fluctuated without a definite trend. An estimate of maximum sustainable yield (MSy) of 7,700 mt was produced from a surplus production analysis. Landings levels in 1992 and 1993 exceeded this value and stock biomass was below that needed to support these landings. Yield-per-recruit analyses indicate that Fmax = 0.22 and F20% = 0.33. Fishing mortality in 1993 was estimated to be slightly above these reference points.
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Content Notes:by Katherine A. Sosebee, Loretta O'Brien, and Lisa C. Hendrickson.
"April 1998."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references (pages 10-11).
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Rights Information:Public Domain
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