Population structure of the chub mackerel (Scomber colias) in the North-east Atlantic inferred from otolith shape and body morphometrics
A. A. Muniz A B , A. Moura A , R. Triay-Portella C , C. Moreira A , P. T. Santos A B and A. T. Correia
A D E
+ Author Affiliations
- Author Affiliations
A Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR/CIMAR), Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos S/N, 4450-208 Matosinhos, Portugal.
B Faculdade de Ciências da Universidade do Porto (FCUP), Rua Campo Alegre S/N, 4169-007 Porto, Portugal.
C Universidad de Las Palmas de Gran Canaria (ULPGC), Calle Juan de Quesada 30, E-35001 Las Palmas de Gran Canaria, Las Palmas, Spain.
D Faculdade de Ciências da Saúde da Universidade Fernando Pessoa (FCS/UFP), Rua Carlos Maia 296, 4200-150 Porto, Portugal.
E Corresponding author. Email: atcorreia.ciimar@gmail.com
Marine and Freshwater Research - https://doi.org/10.1071/MF19389
Submitted: 18 December 2019 Accepted: 15 June 2020 Published online: 13 August 2020
Abstract
The Atlantic chub mackerel (Scomber colias) is an important commercial fish species of the North-east Atlantic. Two-year-old individuals collected between January and April of 2018 at six sampling locations (45 fish per site) of the North-east Atlantic (Azores, Madeira, Canaries and mainland Portugal – Matosinhos, Sesimbra and Portimão) were used for body morphometrics and otolith-shape analyses. Data were analysed by univariate and multivariate statistics. Re-classification success using shape analyses and body morphometrics showed an overall rate of 51 and 74% respectively. Regional differences regarding the otolith-shape analyses suggested a single stock, not necessarily homogenous, with a discrete separation of two main groups (oceanic islands and mainland Portugal). However, body morphometrics showed a more detailed separation in two main groups (Canaries and the others, but with a slight differentiation between fish from Azores-Madeira and mainland Portugal). Moreover, joint analyses gave an overall re-classification success of 82% and allowed a more comprehensive scenario, showing the existence of three main groups (Canaries, Azores-Madeira and mainland Portugal). Regional differences are probably related with different oceanographic conditions influencing the feeding regime and fish growth. The hereby data suggest that S. colias caught in the North-east Atlantic are different population units, and we recommend a fishery management at a finer regional scale.
Additional keywords: fisheries, natural tags, Scombridae, stock delineation.
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