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1. Fish distribution and density investigated by quantitative echosounding : some ecological aspects of the fish fauna in three Portuguese reservoirs by A. Brabrand, S. J. Saltveit, M. J. Brogueira, G. Cabeçadas Publication: Oslo 1986 Universitetet I Oslo . 61 p. 29 cm Availability: Items available: Biblioteca de Algés (1),

2. Fish distribution and density investigated by quantitative echosounding : some ecological aspects of the fish fauna in three Portuguese reservoirs by A. Brabrand, S. J. Saltveit, M. J. Brogueira, G. Cabeçadas Publication: Oslo 1986 Universitetet I Oslo, Zoologisk Museum . 61 p. cm Availability: Items available: Biblioteca de Algés (1),

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