Alternative Survey Indices for Predicting Availability of Longfin Squid to Seasonal Northwest Atlantic Fisheries
- 1 August 1991
- journal article
- Published by Oxford University Press (OUP) in North American Journal of Fisheries Management
- Vol. 11 (3) , 443-450
- https://doi.org/10.1577/1548-8675(1991)011<0443:asifpa>2.3.co;2
Abstract
Catch data from research vessel surveys were used to determine if statistical measures of spatial dispersion can be useful in predicting the availability of migratory, schooling species to specific seasonal fisheries. As an example, spring and autumn bottom trawl catches of the migratory longfin squid Loligo pealei were used to calculate three measures of the species' dispersion in the U.S. Middle Atlantic Bight. Commercial catch per unit effort served as an index of longfin squid availability to the inshore (primarily spring–summer) fishery. Results suggested that indices of dispersion for stocks that do not remain within the area of the fishery throughout the year may be more useful in predicting subsequent availability than are indices of relative abundance. The simplest of the three measures examined here–the proportion of tows within a survey yielding no individuals of the species, calculated from the autumn survey data–exhibited a significant negative correlation with the index of availabil...Keywords
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