00000nam 2200000zi 4500 9.869622 CaOODSP 20241010130705 m o d f cr ||||||||||| 190311s1984 nfca|||#o f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn-nf Fs70-8/84-25E-PDF Bishop, Christine Annette, 1960- author. A comparison of the influence of stratification by depth zone and by individual strata on research vessel abundance estimates / by C.A. Bishop. St. John's, Newfoundland : Fisheries Research Branch, Department of Fisheries and Oceans, [1984] 1 online resource (19 pages) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier CAFSAC research document = CSCPCA document de recherche ; 84/25 Digitized edtion from print [produced by Department of Fisheries and Oceans]. "Not to be cited without permission of the authors." Includes bibliographical reference (page 6). "Stratification by depth zone and by individual strata were compared as to their effect on cod abundance estimates from research surveys in NAFO Subdiv. 3Ps. Stratification by depth zone was proposed as a means of providing population estimates for surveys where coverage was incomplete and when catches were highly variable. Combining strata within depth zones effectively increased the number of sets in the new strata and generally reduced the variances associated with the abundance estimates. Estimates of mean numbers per tow from both methods followed similar patterns."--Abstract Includes abstract in French. gccst Fisheries gccst Surveys Canada. Department of Fisheries and Oceans. CAFSAC research document (Canadian Atlantic Fisheries Scientific Advisory Committee) 84/25 (CaOODSP)9.869616 PDF 642 KB https://publications.gc.ca/collections/collection_2019/mpo-dfo/Fs70-8-84-25-eng.pdf