Decadal changes in biomass and distribution of key fisheries species on Newfoundland's Grand Banks.

Autor: Ruiz-Diaz R; Centre for Fisheries Ecosystems Research, Fisheries & Marine Institute, Memorial University, St. John's, Newfoundland and Labrador, Canada., Pennino MG; Spanish Institute of Oceanography (IEO, CSIC), Madrid Oceanographic Center, Madrid, Spain., Fisher JAD; Centre for Fisheries Ecosystems Research, Fisheries & Marine Institute, Memorial University, St. John's, Newfoundland and Labrador, Canada., Eddy TD; Centre for Fisheries Ecosystems Research, Fisheries & Marine Institute, Memorial University, St. John's, Newfoundland and Labrador, Canada.
Jazyk: angličtina
Zdroj: PloS one [PLoS One] 2024 Apr 01; Vol. 19 (4), pp. e0300311. Date of Electronic Publication: 2024 Apr 01 (Print Publication: 2024).
DOI: 10.1371/journal.pone.0300311
Abstrakt: Canadian fisheries management has embraced the precautionary approach and the incorporation of ecosystem information into decision-making processes. Accurate estimation of fish stock biomass is crucial for ensuring sustainable exploitation of marine resources. Spatio-temporal models can provide improved indices of biomass as they capture spatial and temporal correlations in data and can account for environmental factors influencing biomass distributions. In this study, we developed a spatio-temporal generalized additive model (st-GAM) to investigate the relationships between bottom temperature, depth, and the biomass of three key fished species on The Grand Banks: snow crab (Chionoecetes opilio), yellowtail flounder (Limanda ferruginea), and Atlantic cod (Gadus morhua). Our findings revealed changes in the centre of gravity of Atlantic cod that could be related to a northern shift of the species within the Grand Banks or to a faster recovery of the 2J3KL stock. Atlantic cod also displayed hyperaggregation behaviour with the species showing a continuous distribution over the Grand Banks when biomass is high. These findings suggest a joint stock assessment between the 2J3KL and 3NO stocks would be advisable. However, barriers may need to be addressed to achieve collaboration between the two distinct regulatory bodies (i.e., DFO and NAFO) in charge of managing the stocks. Snow crab and yellowtail flounder centres of gravity have remained relatively constant over time. We also estimated novel indices of biomass, informed by environmental factors. Our study represents a step towards ecosystem-based fisheries management for the highly dynamic Grand Banks.
Competing Interests: The authors have declared that no competing interests exist.
(Copyright: © 2024 Ruiz-Diaz et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
Databáze: MEDLINE
Externí odkaz:
Nepřihlášeným uživatelům se plný text nezobrazuje