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Temporal and spatial distribution of young Brachyplatystoma spp. (Siluriformes: Pimelodidae) along the rapids stretch of the Madeira River (Brazil) before the construction of two hydroelectric dams
Authors:A. Cella‐Ribeiro  L. F. Assakawa  G. Torrente‐Vilara  J. Zuanon  R. G. Leite  C. Doria  F. Duponchelle
Affiliation:1. Programa de Pós‐gradua??o da Rede de Biodiversidade e Biotecnologia da Amaz?nia Legal, Laboratório de Ictiologia e Pesca/, Departamento de Biologia, Universidade Federal de Rond?nia, 76801‐059, Brazil;2. Laboratório de Ictiologia e Pesca/Departamento de Biologia, Universidade Federal de Rond?nia, 76801‐059, Brazil;3. Departamento de Ciências do Mar da Universidade Federal de S?o Paulo, Campus Baixada Santista. Av. Almirante Saldanha da Gama, 89, ponta da praia, Santos, S?o Paulo, 11030‐400, Brazil and Universidade Federal do Amazonas, Av. General Rodrigo Otávio Jord?o, 3000, 69077‐000, Manaus, Amazonas, Brazil;4. Instituto Nacional de Pesquisas da Amaz?nia, Coordena??o de Biodiversidade, Avenida André Araújo, 2936, CP 2223, Petrópolis, 69080‐971, Manaus, Amazonas, Brazil;5. Institut de Recherche pour le Développement ‐ UMR BOREA, Laboratoire Mixte International ‐ Evolution et Domestication de l'Ichtyofaune, Amazonienne (LMI ‐ EDIA), 911 Avenue Agropolis, BP 64501, 34394 Montpellier cedex 5, France
Abstract:
Monthly (April 2009 to May 2010) bottom‐trawl sampling for Brachyplatystoma species along the rapids stretch of the Madeira River in Brazil revealed that Brachyplatystoma rousseauxii larvae and juveniles were present in low abundances in all areas and during all hydrological periods. The presence of larvae and juveniles throughout the hydrological cycle suggests asynchronous spawning in the headwaters of the Madeira River.
Keywords:dourada catfish  hydrological cycle  natural barriers  young‐of‐the‐year
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