View in EDS

Warming, but not acidification, increases metabolism and reduces growth of redfish (Sebastes fasciatus) in the Gulf of St. Lawrence.

Saved in:
Bibliographic Details
Title: Warming, but not acidification, increases metabolism and reduces growth of redfish (Sebastes fasciatus) in the Gulf of St. Lawrence.
Authors: Guitard, Joëlle J., Chabot, Denis, Senay, Caroline, Robert, Dominique, Deslauriers, David
Source: Canadian Journal of Zoology; 10/9/2025, Vol. 103, p1-18, 18p
Subject Terms: GLOBAL warming, METABOLISM, ACIDIFICATION, ENVIRONMENTAL history, THERMAL tolerance (Physiology), HUMAN growth, BIGHT redfish
Geographic Terms: GULF of Saint Lawrence
Abstract (English): Understanding the effects of global change, including temperature, pH, and oxygen availability, on commercially important species is crucial for anticipating consequences for these resources and their ecosystems. In the Gulf of St. Lawrence (GSL), redfish (Sebastes spp.) were under moratorium from 1995 to 2023, but the fishery has reopened in 2024 following massive recruitment observed in 2011–2013. Despite current high abundance, little is known about their metabolic and thermal physiology. To address this, we quantified the effects of four acclimation temperatures (2.5, 5.0, 7.5, and 10.0 °C) and two ocean acidification scenarios (current and future) on standard and maximum metabolic rates (SMR and MMR), aerobic scope (AS), factorial aerobic scope, hypoxia tolerance (O2crit), food consumption, growth and food conversion efficiency (FCE) in redfish (Sebastes fasciatus Storer, 1854). SMR, MMR, and AS increased with temperature, but growth and FCE decreased with temperature, likely due to increased cost of maintenance. Food consumption was lower at 2.5 °C, but similar at higher temperatures. Redfish were less hypoxia-tolerant at higher temperatures. Except for SMR, no significant effect of pH was observed. These results suggest that future changes in the GSL will challenge redfish, with potential long-term effects on growth due to increased energy requirements. [ABSTRACT FROM AUTHOR]
Abstract (French): Comprendre les effets des changements globaux, y compris la température, le pH et la disponibilité en oxygène, sur les espèces marines d'importance commerciale est essentiel pour anticiper les conséquences sur cette ressource et les écosystèmes. Dans le golfe du Saint-Laurent (GSL), la pêche au sébaste (Sebastes spp.) a été soumise à un moratoire de 1995 à 2023, puis réouverte en 2024 à la suite d'un recrutement massif des cohortes 2011–2013. Malgré une forte abondance, leur physiologie métabolique et thermique demeure peu connue, rendant difficile la prédiction de leur réponse aux conditions changeantes du GSL. Nous avons quantifié les effets de quatre températures d'acclimatation (2.5, 5.0, 7.5 et 10.0 °C) et de deux niveaux de pH (7,35 et 7,75) sur les taux métaboliques standard et maximal (TMS et TMM), la capacité aérobie (CA), la capacité aérobique factorielle, la tolérance à l'hypoxie (O2crit), la consommation de nourriture, la croissance et l'efficacité alimentaire chez les sébastes (S. fasciatus). TMS, TMM et CA augmentaient avec la température, mais la croissance diminuait à 10.0 °C, probablement en raison de la demande métabolique accrue, tandis que la consommation alimentaire restait similaire de 5.0 à 10.0 °C. O2crit était plus faible chez les poissons acclimatés à 2.5 et 5.0 °C, indiquant une moindre tolérance à l'hypoxie à des températures plus élevées. Aucun effet significatif du pH n'a été observé, sauf pour le SMR. Ces résultats suggèrent que les changements futurs dans le GSL poseront des défis aux sébastes, avec des effets potentiels à long terme sur leur croissance en raison d'une demande énergétique accrue. [Ceci est une traduction fournie par l'auteur du résumé en anglais.] [ABSTRACT FROM AUTHOR]
Copyright of Canadian Journal of Zoology is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Complementary Index
Description
Abstract:Understanding the effects of global change, including temperature, pH, and oxygen availability, on commercially important species is crucial for anticipating consequences for these resources and their ecosystems. In the Gulf of St. Lawrence (GSL), redfish (Sebastes spp.) were under moratorium from 1995 to 2023, but the fishery has reopened in 2024 following massive recruitment observed in 2011–2013. Despite current high abundance, little is known about their metabolic and thermal physiology. To address this, we quantified the effects of four acclimation temperatures (2.5, 5.0, 7.5, and 10.0 °C) and two ocean acidification scenarios (current and future) on standard and maximum metabolic rates (SMR and MMR), aerobic scope (AS), factorial aerobic scope, hypoxia tolerance (O<subscript>2</subscript>crit), food consumption, growth and food conversion efficiency (FCE) in redfish (Sebastes fasciatus Storer, 1854). SMR, MMR, and AS increased with temperature, but growth and FCE decreased with temperature, likely due to increased cost of maintenance. Food consumption was lower at 2.5 °C, but similar at higher temperatures. Redfish were less hypoxia-tolerant at higher temperatures. Except for SMR, no significant effect of pH was observed. These results suggest that future changes in the GSL will challenge redfish, with potential long-term effects on growth due to increased energy requirements. [ABSTRACT FROM AUTHOR]
ISSN:00084301
DOI:10.1139/cjz-2025-0014