Journal Article

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

M.L. Acolas, V. Véron, H. Jourdan, M.L. Bégout, M.R. Sabatié and J.L. Baglinière

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 63, issue 3, pages 476-484
Published in print January 2006 | ISSN: 1054-3139
Published online January 2006 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2005.05.022
Upstream migration and reproductive patterns of a population of allis shad in a small river (L'Aulne, Brittany, France)

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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

Journal Article.  4627 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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