Document de support pour l'évaluation du hareng de l'Atlantique (Clupea harengus) dans le sud du Golfe du Saint-Laurent (Division OPANO 4TVn) en 2022-2023

Thumbnail image

Download files

Language of the publication
French
Date
2024
Type
Report
Author(s)
  • Maynard, Laurie
  • Burbank, Jacob
  • DeJong, Rachel
  • Turcotte, François
  • McDermid, Jenni
  • Sylvain, François-Étienne
  • Rolland, Nicolas
Publisher
Pêches et Océans Canada, Secrétariat canadien des avis scientifiques

Abstract

Atlantic Herring (Clupea harengus) in Northwest Atlantic Fisheries Organization (NAFO) Division 4T, referred to as the southern Gulf of St. Lawrence (sGSL), consists of two spawning components, spring spawners and fall spawners. This document presents the most recent information on trends in abundance, distribution, and harvest for the spring and fall spawning Herring components in NAFO Division 4T. This includes catch-at-age and catch-per-unit-effort (CPUE) indices, fisheries-independent acoustic indices, experimental gillnet survey indices, mesh selectivity, fishery-dependent acoustic indices and catches in the multi-species bottom trawl survey of the sGSL. The data and indices are reported for the sGSL for the spring spawners, and regionally-disaggregated (North, Middle, and South regions) for the fall spawners where applicable. This information is the basis of the assessment of spring and fall spawning 4TVn Atlantic Herring. Since the last assessment in 2022, we continued collecting data from our various data sources including commercial landings, telephone survey, port sampling, fishery independent acoustic survey, industry acoustic survey of spawning grounds, experimental variable mesh size net and multispecies bottom-trawl survey. From these data sources, the calculations of catch-at-age matrices were improved by translating calculations from Statistical Analysis Software and Excel into R language. The translation process facilitates the future reproduction of calculations, and was an opportunity to address issues in the calculation of past biomass estimates. While the trends remained after this process, yearly estimates shifted slightly higher or lower depending on the region and the spawning component. In addition, the process fixed the abnormal retrospective pattern observed in the previous assessment which means a more accurate biomass estimates. The spring and fall populations still face a lot of uncertainties, especially regarding rising sea temperature, which may change spatial distribution of Atlantic Herring and affect other demographic metrics (i.e., recruitment). This document is meant to support the stock assessment of Atlantic Herring in 4TVn by presenting data sources and data changes between the 2022 and 2024 assessment, but does not include details on model methodology.

Description

1 online resource (xiii, 149 pages) : maps, charts

Subject

  • Nature and environment,
  • Water

Pagination

xiii, 149 pages

Identifiers

Government document number
Fs70-5/2024-058F-PDF
ISBN
9780660725420
ISSN
2292-4272

Report

Report no.
2024/058
Series title
Document de recherche (Secrétariat canadien des avis scientifiques)

Citation(s)

Maynard, L., Burbank, J., DeJong, R., Turcotte, F., McDermid, J., Sylvain, F.-E. et Rolland, N. 2024. Document de support pour l’évaluation du hareng de l’Atlantique (Clupea harengus) dans le sud du Golfe du Saint-Laurent (Division OPANO 4TVn) en 2022-2023. Secr. can. des avis sci. du MPO. Doc. de rech. 2024/058. xiii + 149 p.

Download(s)

URI

Collection(s)

Fisheries

Full item page

Full item page

Page details

Date modified: