00000nam 2200000za 4500 9.827843 CaOODSP 20221107144913 cr ||||||||||| 161118s2016 onca ob f000 0 eng d CaOODSP eng eng fre n-cn--- Fs70-5/2016-097E-PDF Estimation of local spawning biomass of Atlantic Herring from acoustic data collected during fall commercial gillnet fishing activities in the southern Gulf of St. Lawrence (NAFO Div. 4T) [electronic resource] / Tobie Surette ... [et al.]. Title at head of French abstract: Estimation de la biomasse du stock de reproducteurs de harengs de l'Atlantique à l'échelle locale à partir des données acoustiques recueillies au cours des activités de pêche commerciale au filet maillant d'automne dans le sud du golfe du Saint-Laurent (division 4T de l'Organisation des pêches de l'Atlantique Nord-Ouest (OPANO)) Ottawa : Fisheries and Oceans Canada, Ecosystems and Oceans Science, c2016. v, 23 p. : ill. Canadian Science Advisory Secretariat research document, 1919-5044 ; 2016/097, Gulf Region Cover title. “November 2016.” Includes bibliographical references (p. 11-12). "In partnership with Fisheries and Oceans Canada (DFO), fish harvesters participating in the Atlantic herring (Clupea harengus) fall fishery in NAFO Div. 4T surveyed five spawning grounds in the southern Gulf of St. Lawrence using acoustic sounders over the course of their regular fishing activities from 2002 to 2012. Using a statistical method developed for Fisherman’s Bank, seasonal biomass was estimated for all five spawning grounds. Acoustic data from each area was processed and analyzed to produce nightly biomass estimates for a subset of days over the season. Missing biomass values were simulated using a Bayesian time-series model, then grouped by spawning aggregation using a spatial-temporal clustering model. Seasonal biomass estimates were then produced by year and region. While this approach showed some promise, the model did not provide realistic results for two of the five regions. Furthermore, there are also underlying methodological and biological issues which raise significant doubts as to the comparability of results among regions. Given the inconsistencies in model performance and the underlying issues with the data it was decided that these data could not be used to develop a time series of local abundance indices for herring as part of the fall herring stock assessment. Recommendations are made to aid in future spawning bed specific acoustic surveys."--Abstract, p. iv. Includes abstract in French. gccst Biomass gccst Environmental management gccst Fisheries management Surette, T. J. Canada. Department of Fisheries and Oceans. Canada. Ecosystems and Oceans Science. Canadian Science Advisory Secretariat. Research document (Canadian Science Advisory Secretariat) 1919-5044 ; 2016/097, Gulf Region. (CaOODSP)9.507396 PDF 978 KB https://publications.gc.ca/collections/collection_2016/mpo-dfo/Fs70-5-2016-097-eng.pdf