00000cam 2200000zi 4500 9.960670 CaOODSP 20261028141231 m o d f cr cn |||||||| 260306t20262026nfcdb ob f000 0 eng d 9780660988214 CaOODSP eng rda CaOODSP eng eng fre n-cn-nf Fs97-6/3764E-PDF Gullage, Lauren, author. Revision of data layers (strata, sampling units, centroids) critical to the design and operation of the Fisheries and Oceans Canada - Newfoundland and Labrador scientific research vessel bottom trawl surveys / Lauren Gullage, Rick M. Rideout, Kathleen Ryan, Brent Brockway, Brian Healey and Neil Ollerhead. St. John’s, Newfoundland and Labrador : Science Branch, Newfoundland and Labrador Region, Fisheries and Oceans Canada, 2026. ©2026 1 online resource (ix, 38 pages) : charts, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Canadian technical report of fisheries and aquatic sciences, 1488-5379 ; 3764 Includes bibliographical references. "Scientific research vessel (RV) bottom trawl surveys provide critical fishery-independent data used in stock assessments and ecosystem monitoring programs. Since 1971, RV bottom trawl surveys in the Newfoundland and Labrador (NL) region have been based on a random stratified survey design. The components that make up the survey design (e.g., strata, sampling units, and centroids) were originally documented on paper maps. Approximately 20 years ago, efforts were made to digitize key components (e.g., strata and centroids) to support improved mapping capabilities and incorporate automation into the set allocation process. Since the digitization of these files, numerous discrepancies have been identified raising concerns about implications to the survey design and underlying data. To address these concerns and to develop a full suite of accurate digital survey-related products, work was conducted to update the digitized strata and centroid files as well as create a digital copy of the associated sampling units. This report outlines the steps taken to complete this work and describes the data products generated as a result"--Abstract, page viii. Includes abstract in French. Fish surveys Newfoundland and Labrador. Trawls and trawling Newfoundland and Labrador. Inventaires ichtyologiques Terre-Neuve-et-Labrador. Chaluts Terre-Neuve-et-Labrador. Canada. Department of Fisheries and Oceans. Newfoundland and Labrador Region. Science Branch, issuing body. Canadian technical report of fisheries and aquatic sciences ; 3764. (CaOODSP)9.504449 PDF 4.22 MB https://publications.gc.ca/collections/collection_2026/mpo-dfo/fs97-6/Fs97-6-3764-eng.pdf