english Icono del idioma   español Icono del idioma  

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12008/28681 How to cite
Title: Marine mammal bycatch by the industrial bottom trawl fishery at the Río de la Plata Estuary and the adjacent Atlantic Ocean.
Authors: Franco-Trecu, Valentina
Szephegyi, María Nube
Doño, Florencia
Forselledo Caldera, Rodrigo
Reyes Blengini, Federico
Passadore, Cecilia
Crespo, E.A.
Inchausti, Pablo
Type: Artículo
Editors: Silva, A.A. da
Keywords: Pontoporia blainvillei, Otaria flavescens, Arctocephalus australis, Mortality, Bottom-trawl, Fisheries, Bycatch
Issue Date: 2019
Abstract: Fisheries interactions with non-target marine vertebrates are a worldwide problem. The impact of coastal bottom trawl fisheries on marine mammals has never been evaluated before in the Río de la Plata Estuary and the adjacent Atlantic Ocean. Our aim was estimating the bycatch per unit effort (BcPUE) and incidental mortality rates of marine mammals caused by the industrial coastal bottom trawl fisheries fleet. We evaluated the mortality of three species (i.e., franciscana dolphin Pontoporia blainvillei, South American sea lion Otaria flavescens, and the South American fur seal Arctocephalus australis); these species are facing conservation problems either at the regional or local scale. We conducted an onboard data collection program of marine mammals’ bycatch involving crew members of 10 vessels (30%) of the Uruguayan coastal bottom trawl fleet between January 2009 and April 2012. A total of 102 marine mammal individuals were bycaught during 490 fishing trips involving 2,398 fishing days. Mortalities estimated for franciscana dolphin were the highest among the species affected, with values adding up to ~100 individuals for year (with scenarios of population decline in the area), followed by South American sea lion with ~77 individuals by year (0.8% of local population) and the South American fur seal with an annual mortality estimate of ~25 individuals (~0.02% of local population). BcPUE showed significant temporal variation, with franciscana dolphin BcPUE varying seasonally and those of otariids according to their breeding season. Our estimates of marine mammal bycatch by bottom trawl fisheries should constitute an important input for the sustainable management of fisheries and the conservation of marine biodiversity in the southwestern Atlantic Ocean.
Publisher: Pontificia Universidad Católica de Valparaiso
IN: Latin american journal of aquatic research, 2019, 47(1): 89-101
Citation: Franco-Trecu, V, Szephegyi, M, Doño, F, y otros "Marine mammal bycatch by the industrial bottom trawl fishery at the Río de la Plata Estuary and the adjacent Atlantic Ocean". Latin american journal of aquatic research. [en línea] 2019, 47(1): 89-101. 13 h. DOI: 10.3856/vol47-issue1-fulltext-10
ISSN: 0718-560X
License: Licencia Creative Commons Atribución (CC - By 4.0)
Appears in Collections:Publicaciones académicas y científicas - Facultad de Ciencias

Files in This Item:
File Description SizeFormat  
10.3856vol47-issue1-fulltext-10.pdf610,14 kBAdobe PDFView/Open


This item is licensed under a Creative Commons License Creative Commons