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JNAFS

01

W. J. Overholtz

National Marine Fisheries Service, Northeast Fisheries Center
Woods Hole Laboratory, Woods Hole, Massachusetts 02543, USA

Source - Journal of Northwest Atlantic Fishery Science, Volume 9(2): 115-121
ISSN-0250-6408

Abstract

Density-dependent growth relationships in the Northwest Atlantic stock of Atlantic mackerel (Scomber scombrus) were investigated with regression and non-parametric statistical procedures. Mean weight at ages 1-3 for research survey caught and ages 2-4 for commercially caught fish were found to be significantly and negatively correlated with stock density. Weight-at-age of fish from the 1978-82, and 1984 cohorts were significantly different at ages l, 2 and 3. The 1982 cohort was found to be one of the slowest growing on record; it is also one of the largest recruiting year-classes that has been observed. Results suggested that a two stage growth model that accounts for different distribution of juvenile and adult fish may be appropriate for this stock. Early growth may be related to year-class size, whereas stock size may be more influential after juvenile fish join the adult stock further offshore.

Language - English
Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - December 1989
Publication Type - Journal Article

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