Marine and continental distribution and dynamic of the early spawning migration of twaite shad (Alosa fallax (Lacépède, 1803)) and allis shad (Alosa alosa (Linnaeus, 1758)) in the north-west of the Iberian Peninsula
D. J. Nachón A B G , M. Mota C D E , C. Antunes D E , M. J. Servia F and F. Cobo A B
+ Author Affiliations
- Author Affiliations
A Departamento de Zooloxía e Antropoloxía Física, Facultade de Bioloxía, Universidade de Santiago de Compostela, Campus Vida, Lope Gómez de Marzoa s/n, E-15782 Santiago de Compostela, Spain.
B Estación de Hidrobioloxía ‘Encoro do Con’, Universidade de Santiago de Compostela, Castroagudín s/n, E-36617 Vilagarcía de Arousa, Pontevedra, Spain.
C Biomedical Sciences Institute Abel Salazar, University of Porto, Rua de Jorge Viterbo Ferreira 228, PT-4050-313 Porto, Portugal.
D Interdisciplinary Centre of Marine and Environmental Research (CIIMAR/CIMAR), University of Porto, Rua dos Bragas 289, PT-4050-123 Porto, Portugal.
E Minho River Aquamuseum, Parque do Castelinho, PT-4920-290 Vila Nova de Cerveira, Portugal.
F Department of Animal Biology, Plant Biology and Ecology, Faculty of Sciences, University of A Coruña, Campus da Zapateira s/n, E-15008 A Coruña, Spain.
G Corresponding author. Email: davidjose.nachon@usc.es
Marine and Freshwater Research 67(8) 1229-1240 https://doi.org/10.1071/MF14243
Submitted: 14 August 2014 Accepted: 28 May 2015 Published: 28 September 2015
Abstract
Knowledge regarding the marine phase of twaite shad (Alosa fallax (Lacépède, 1803)) and allis shad (Alosa alosa (Linnaeus, 1758)) remains limited. To understand the coastal and continental distribution and dynamic of migration of these species, in the present study we collected official data records of marine landings (kg), separated according to species, for all fish markets in Galicia (north-west of the Iberian Peninsula) and undertook freshwater field sampling campaigns. The findings indicate that both species of shad exhibit a coastal distribution near the rivers where they spawn, namely the Minho and Ulla rivers. Catches at sea declined from January, a phenomenon that can be understood as the onset of migration to the rivers. Bycatch reports are important because both A. fallax and A. alosa are listed in the Annex V of the European Union Habitats Directive, which lists animal species whose exploitation and taking in the wild may be subject to management measures. However, for a better management of these species it is necessary to understand the magnitude of displacements and connection of shad populations at sea.
Additional keywords: anadromous, continental shelf, population trends, upwelling, young-of-the-year, YOY.
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