00000nam 2200000za 4500 9.826861 CaOODSP 20221107144659 cr ||||||||||| 161103s2016 oncbd ob f000 0 eng d CaOODSP eng eng fre n-cn--- Fs70-5/2016-067E-PDF Surette, T. J. Abundance indices and selectivity curves from experimental multi-panel gillnets for the southern Gulf of St. Lawrence fall herring fishery [electronic resource] / T.J. Surette, C.H. LeBlanc, and A. Mallet. Title at head of French abstract: Indices d'abondance et courbes de sélectivité issus de la pêche aux filets maillants expérimentaux à panneaux multiples du hareng d'automne dans le sud du golfe du Saint-Laurent Ottawa : Fisheries and Oceans Canada, c2016. vi, 23 p. : col. map Canadian Science Advisory Secretariat research document, 1919-5044 ; 2016/067, Gulf Region Cover title. “Science Branch, Gulf Region.” “October 2016.” Includes bibliographical references (p. 9). "In partnership with Fisheries and Oceans Canada (DFO), fish harvesters participating in the Atlantic herring (Clupea harengus) fall fishery in NAFO 4T surveyed five spawning grounds in the southern Gulf of St. Lawrence using multi-panel experimental gillnets over the course of their regular fishing activities from 2002 to 2013. The results of these surveys are analyzed to identify whether they can be used as indices of local abundance for assessment of fall 4T herring. Catches were analyzed with a selectivity model, which produced mesh-specific selectivity curves, length-based population indices, and age disaggregated indices for the North, Middle, and South regions of the southern Gulf of St. Lawrence. The selectivity model has little ability to estimate how fishing power varies with mesh size, so population indices might be length-biased. Uncertainties also underlie the scale of catches due to methodological and biological differences between years and regions. Nevertheless, cohort tracks in the catch-at-age were fairly consistent between regions and indicate that some dynamics of the underlying population are captured. Consequently, the selectivity and catch-at-age indices were approved for use in future population dynamics models of Altantic herring for the southern Gulf of St. Lawrence"--Abstract, p. v. Includes abstract in French. gccst Fisheries resources gccst Salt water fish gccst Fishing area gccst Fisheries management LeBlanc, Caroline, 1961- Mallet, André. Canada. Department of Fisheries and Oceans. Canada. Ecosystems and Oceans Science. Canadian Science Advisory Secretariat. Research document (Canadian Science Advisory Secretariat) 1919-5044 ; 2016/067, Gulf Region (CaOODSP)9.507396 PDF 1.01 MB https://publications.gc.ca/collections/collection_2016/mpo-dfo/Fs70-5-2016-067-eng.pdf