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ICES Journal of Marine Science: Journal du Conseil 2006 63(3):476-484; doi:10.1016/j.icesjms.2005.05.022
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© 2005 International Council for the Exploration of the Sea

Upstream migration and reproductive patterns of a population of allis shad in a small river (L'Aulne, Brittany, France)

M.L. Acolasa, V. Véronb, H. Jourdana, M.L. Bégoutc,*, M.R. Sabatiéa and J.L. Baglinièrea

a UMR INRA-Agrocampus Ecobiologie et Qualité des Hydrosystèmes Continentaux 65 rue de Saint Brieuc, CS 84215, F-35042 Rennes Cedex, France
b Institut d'aménagement de la Vilaine Boulevard de Bretagne, BP 11, 56130 La Roche-Bernard, France
c Centre de Recherche sur les Ecosystèmes Marins et Aquacoles, UMR CNRS/Ifremer BP 5, F-17137 L'Houmeau, France

*Correspondence to M. L. Bégout: tel: +33 546 500695; fax: +33 546 500600. e-mail: mlbegout{at}ifremer.fr.

The characteristics and activity of adult allis shad [Alosa alosa (L.)] were analysed during the last part of their upstream migration in the L'Aulne, a small river in Brittany, and during reproduction on a unique spawning ground downstream of an insurmountable dam. The age of the spawners ranged from three to seven years, females being larger and older than males. Population-level migration and reproduction were studied by counting the number of migrating fish, by estimating the sex ratio, and by counting the number of nocturnal spawning acts for three consecutive years starting in 2000. The influence of the environment, especially water temperature and discharge, was highlighted: temperature during migration may supplant the influence of water flow, although high flow could allow passage over the dam. Such factors partly explain the annual pattern of migration and reproduction during the spawning season. The study showed that the biological features and characteristics of this population of allis shad in a small river were similar to those of western Atlantic stocks in large rivers.

Keywords: allis shad, anadromous migration, biological features, reproduction, small river

Received 4 November 2004; accepted 30 May 2005.


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