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ICES Journal of Marine Science: Journal du Conseil 2004 61(8):1291-1304; doi:10.1016/j.icesjms.2004.07.023
© 2004 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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An assessment of the upstream migration and reproductive behaviour of allis shad (Alosa alosa L.) using acoustic tracking

M.L. Acolasa, M.L. Bégout Anrasa,*, V. Véronb, H. Jourdanb, M.R. Sabatiéb and J.L. Baglinièreb

a Centre de Recherche sur les Ecosystèmes Marins et Aquacoles UMR CNRS/Ifremer, BP 5, F-17137 L'Houmeau, France
b UMR INRA-ENSA Ecobiologie et Qualité des Hydrosystèmes Continentaux 65 rue de Saint Brieuc, CS 84215, F-35042 Rennes Cedex, France

*Correspondence to M. L. Bégout Anras: tel: +33 5 4650 0695; fax: +33 5 4650 0600. e-mail: mlbegout{at}ifremer.fr.

We provide a detailed description of the migratory and reproductive behaviour of allis shad (Alosa alosa L.), a species that is in decline in Europe. Adult swimming behaviour during the last part of upstream migration and on a spawning ground downstream of an insurmountable dam was studied in detail and its main features identified, "characterized" in this context. Mobile telemetry and a fixed telemetry system were used to record fish positions and to monitor 23 acoustically tagged individuals (17 females and six males) during the 2001 and 2002 reproductive seasons. Allis shad showed considerable exploratory behaviour, and a rest area was observed 1.5 km downstream of the spawning ground. Thirteen individuals were observed on the spawning area, though both males and females spent most of their time (70–99%) away from it. Male and female residency times on the spawning area were, respectively, 1–11 days and 1–7 days, and females were observed during both day and night on the spawning ground. In 2002, an analysis of the 3D swimming behaviour on the spawning ground of six individuals allowed us to estimate the number of spawning events per fish. Males participated in more spawning acts (up to 60) than females (0–2).

Keywords: Alosa alosa, anadromous migration, behavioural ecology, reproduction, telemetry

Received 14 January 2004; accepted 18 July 2004.


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M.L. Acolas, V. Veron, H. Jourdan, M.L. Begout, M.R. Sabatie, and J.L. Bagliniere
Upstream migration and reproductive patterns of a population of allis shad in a small river (L'Aulne, Brittany, France)
ICES J. Mar. Sci., January 1, 2006; 63(3): 476 - 484.
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