NAFO posted on October 18, 1996 13:18
N. G. Cadigan, D. L. Boulos and W. M. Hickey
Department of Fisheries and Oceans, Fisheries Habitat and Management Branch
P. O. Box 5667, St. John's, Newfoundland, Canada A1C 5X1
Source - Journal of Northwest Atlantic Fishery Science, Volume 19: 41-49
ISSN-0250-6408
Cadigan, N.G., Boulos, D.L., and Hickey, W.M. 1996. Analysis of Subsampled Catches from Trouser Trawl Size Selectivity Studies. J. Northw. Atl. Fish. Sci. 19: 41-49. https://doi.org/10.2960/J.v19.a4
Abstract
An analysis of a trouser trawl experiment with multiple subsampled hauls is presented. The standard method of analysis involves scaling catches by subsampling fractions and combining the catches for each haul to obtain an estimate of the size selectivity of the test gear. This procedure results in invalid statistical inferences and is not appropriate if the split of fish is not the same in all hauls or if subsampling fractions have measurement error. Modifications of the selectivity model are proposed that significantly improve the analysis of this type of data (e.g. to estimate selectivity without subsampling fractions). Likelihood ratio tests are developed to test which modified selectivity model best fits the data. Confidence bounds are developed as diagnostic tools. The procedures are illustrated with a data analysis.
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Language - English
Publisher - Northwest Atlantic Fisheries Organization (NAFO), Dartmouth, N.S., Canada
Publication Date - September 1996
Publication Type - Journal Article
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Citation: Cadigan, N.G., Boulos, D.L., and Hickey, W.M. 1996. Analysis of Subsampled Catches from Trouser Trawl Size Selectivity Studies. J. Northw. Atl. Fish. Sci. 19: 41-49. https://doi.org/10.2960/J.v19.a4