Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon

Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon

ABSTRACT This paper explores the effects of two run-of-river dams (Jirau and Santo Antônio) built in cascade in the middle Madeira River (Brazil) on the interruption of long-distance migration routes of the gilded catfish (Brachyplatystoma rousseauxii). A participative monitoring system was set up to compare capture by commercial fishers approximately 1500 km upstream of the dams in Bolivia, before (1998-2007) and after (2015-2017) dam closure. A significant decrease in gilded catfish catches and in catch per unit effort was observed after dam closure, whereas no significant difference in mean weight was found. Back-estimation of age suggests that the few individuals remaining after dam closure in 2009 are a mixture of old homers that returned upstream before dam closure, and residents hatched after dam closure and trapped in the upper Madeira. Unless fishways in the Madeira River dams improve their efficiency, the gilded catfish might become rare and in danger of regional extinction in the upper Madeira basin in the next few years, negatively affecting river fisheries.

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Autores principales: Damme,Paul A. Van, Córdova-Clavijo,Leslie, Baigún,Claudio, Hauser,Marilia, Doria,Carolina R. da Costa, Duponchelle,Fabrice
Formato: Digital revista
Idioma:English
Publicado: Sociedade Brasileira de Ictiologia 2019
Acceso en línea:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500213
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spelling oai:scielo:S1679-622520190005002132019-12-05Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian AmazonDamme,Paul A. VanCórdova-Clavijo,LeslieBaigún,ClaudioHauser,MariliaDoria,Carolina R. da CostaDuponchelle,Fabrice Environmental impact Fish migration Fishways Madeira dams River connectivity ABSTRACT This paper explores the effects of two run-of-river dams (Jirau and Santo Antônio) built in cascade in the middle Madeira River (Brazil) on the interruption of long-distance migration routes of the gilded catfish (Brachyplatystoma rousseauxii). A participative monitoring system was set up to compare capture by commercial fishers approximately 1500 km upstream of the dams in Bolivia, before (1998-2007) and after (2015-2017) dam closure. A significant decrease in gilded catfish catches and in catch per unit effort was observed after dam closure, whereas no significant difference in mean weight was found. Back-estimation of age suggests that the few individuals remaining after dam closure in 2009 are a mixture of old homers that returned upstream before dam closure, and residents hatched after dam closure and trapped in the upper Madeira. Unless fishways in the Madeira River dams improve their efficiency, the gilded catfish might become rare and in danger of regional extinction in the upper Madeira basin in the next few years, negatively affecting river fisheries.info:eu-repo/semantics/openAccessSociedade Brasileira de IctiologiaNeotropical Ichthyology v.17 n.4 20192019-01-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500213en10.1590/1982-0224-20190118
institution SCIELO
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country Brasil
countrycode BR
component Revista
access En linea
databasecode rev-scielo-br
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region America del Sur
libraryname SciELO
language English
format Digital
author Damme,Paul A. Van
Córdova-Clavijo,Leslie
Baigún,Claudio
Hauser,Marilia
Doria,Carolina R. da Costa
Duponchelle,Fabrice
spellingShingle Damme,Paul A. Van
Córdova-Clavijo,Leslie
Baigún,Claudio
Hauser,Marilia
Doria,Carolina R. da Costa
Duponchelle,Fabrice
Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
author_facet Damme,Paul A. Van
Córdova-Clavijo,Leslie
Baigún,Claudio
Hauser,Marilia
Doria,Carolina R. da Costa
Duponchelle,Fabrice
author_sort Damme,Paul A. Van
title Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
title_short Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
title_full Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
title_fullStr Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
title_full_unstemmed Upstream dam impacts on gilded catfish Brachyplatystoma rousseauxii (Siluriformes: Pimelodidae) in the Bolivian Amazon
title_sort upstream dam impacts on gilded catfish brachyplatystoma rousseauxii (siluriformes: pimelodidae) in the bolivian amazon
description ABSTRACT This paper explores the effects of two run-of-river dams (Jirau and Santo Antônio) built in cascade in the middle Madeira River (Brazil) on the interruption of long-distance migration routes of the gilded catfish (Brachyplatystoma rousseauxii). A participative monitoring system was set up to compare capture by commercial fishers approximately 1500 km upstream of the dams in Bolivia, before (1998-2007) and after (2015-2017) dam closure. A significant decrease in gilded catfish catches and in catch per unit effort was observed after dam closure, whereas no significant difference in mean weight was found. Back-estimation of age suggests that the few individuals remaining after dam closure in 2009 are a mixture of old homers that returned upstream before dam closure, and residents hatched after dam closure and trapped in the upper Madeira. Unless fishways in the Madeira River dams improve their efficiency, the gilded catfish might become rare and in danger of regional extinction in the upper Madeira basin in the next few years, negatively affecting river fisheries.
publisher Sociedade Brasileira de Ictiologia
publishDate 2019
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252019000500213
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