00000nam 2200000zi 4500 9.895621 CaOODSP 20250702125022 m o d f cr bn||||||||| 210125s1987 nscbd ob f000 0 eng d CaOODSP eng rda CaOODSP eng eng fre n-cn-nf Fs70-8/87-11E-PDF Baird, J. W., author. Examination of temporal and spatial variability of length compositions for the 1983 Division 3L cod trap fishery with reference to resulting age composition estimation / by J.W. Baird and S.C. Stevenson and S. Gavaris. [Dartmouth, N.S.] : Canadian Atlantic Fisheries Scientific Advisory Committee ; St. John's, Newfoundland : Science Branch, Department of Fisheries and Oceans ; St. Andrews, New Brunswick : Biological Station, Department of Fisheries and Oceans, [1987?] 1 online resource (16 pages) : maps, graphs. text txt rdacontent computer c rdamedia online resource cr rdacarrier CAFSAC research document ; no. 87/11 Cover title. "Not to be cited without permission of the authors." Includes bibliographical references (pages 6-7). "A study was conducted during the 1983 Newfoundland cod trap fishery in NAFO Div. 3L to examine the temporal and spatial variability amongst commercial length frequency samples and to determine the impact of any differences on age composition estimation. Likelihood ratio statistics were used to evaluate the relative contributions of time and location to the overall variation. The analysis showed that both month and unit area contributed significantly to the variability in length compositions, with unit area explaining considerably more variation than month. This suggests that length frequencies should be weighted by unit area landings rather than just by monthly landings as is presently the case. In terms of age composition estimation, differences of up to 25% for some ages occurred depending on whether frequencies were weighted by month, unit area or both month and unit area. Considering these differences, researchers should consider spatial as well as temporal variability when using commercial sampling data from this fishery to estimate removals at age"--Abstract, page 2. Includes abstract and series statement in French. Atlantic cod fisheries Newfoundland and Labrador Atlantic Coast. Fish stock assessment Newfoundland and Labrador Atlantic Coast. Morue Pêche commerciale Terre-Neuve-et-Labrador Atlantique, Côte de l'. Ressources halieutiques Évaluation Terre-Neuve-et-Labrador Atlantique, Côte de l'. Canadian Atlantic Fisheries Scientific Advisory Committee, issuing body. Canada. Department of Fisheries and Oceans. Science, issuing body. Canada. Department of Fisheries and Oceans. Biological Station (St. Andrews, N.B.), issuing body. CAFSAC research document (Canadian Atlantic Fisheries Scientific Advisory Committee) no. 87/11. (CaOODSP)9.869616 PDF 896 KB https://publications.gc.ca/collections/collection_2021/mpo-dfo/fs70-8/Fs70-8-87-11-eng.pdf