00000cam 2200000zi 4500 9.965596 CaOODSP 20261007135813 m o d f cr cn |||||||| 260901e202609##oncdb ob f000 0 eng d 9781100004037 CaOODSP eng rda CaOODSP n-cn-qu n-cn-nf Fs70-5/2026-064E-PDF Rioux, Ève, author. Potential mechanisms behind changing survey catchability in 4RSw Atlantic herring / Ève Rioux, Kim Émond, Caroline Lehoux, Elisabeth Van Beveren. Ottawa : Canadian Science Advisory Secretariat (CSAS), September 2026. ©2026 1 online resource (iv, 37 pages) : charts, maps. text txt rdacontent computer c rdamedia online resource cr rdacarrier Research document, 1919-5044 ; 2026/064 Issued also in French under title: Mécanismes potentiels influençant la capturabilité dans les relevés du hareng atlantique (4RSw). Includes bibliographical references (pages 20-24). "This document aims to explore possible physiological and environmental mechanisms and to identify covariates linked to an apparent shift in catchability of herring in 4RSw. We first established the evidence for a delayed fall migration based on landing records and fish telemetry data, showing a 30–60 days temporal mismatch between the median fall acoustic survey date and the date of 50% cumulative landings in 4Rbc from 1991–2022. This shift was not tied to the timing of fall herring spawning. Rather, a delay in landings was associated with lower herring body condition in the fall, suggesting changes in feeding conditions prior to migration into the survey area. Habitat suitability maps suggested that environmental changes do not constrain herring migration into the survey area, but have become increasingly favourable in northern, unsurveyed waters"--Abstract, page iv. Atlantic herring Migration Newfoundland and Labrador Atlantic Coast. Atlantic herring Migration Québec (Province) Fish surveys Newfoundland and Labrador Atlantic Coast. Fish surveys Québec (Province) Canada. Department of Fisheries and Oceans. Quebec Region, issuing body. Canadian Science Advisory Secretariat, issuing body. Mécanismes potentiels influençant la capturabilité dans les relevés du hareng atlantique (4RSw) / (CaOODSP)9.965599 Research document (Canadian Science Advisory Secretariat) 2026/064. (CaOODSP)9.507396 PDF 4.59 MB https://publications.gc.ca/collections/collection_2026/mpo-dfo/fs70-5/Fs70-5-2026-064-eng.pdf