Growth and seasonal behavior of Anguilla anguilla in the River Minho tidal freshwater wetlands

Abstract

Event Abstract Back to Event Growth and seasonal behavior of Anguilla anguilla in the River Minho tidal freshwater wetlands Helena Correia1, Catarina Braga2, Mário Jorge Araújo3, Allan T. Souza4 and Carlos Antunes5* 1 Universidade de Aveiro, Biologia, Portugal 2 Instituto Português do Mar e da Atmosfera, Portugal 3 CESAM, Portugal 4 CIIMAR - University of Porto, Portugal 5 CIIMAR, Portugal The River Minho estuary, located on the northwest coast of the Iberian Peninsula, is a mesotidal estuary, partially mixed that during the period of high floods it tends to evolve towards a salt wedge estuary. The influence of spring tides extends approximately 40 km upstream and the tidal freshwater wetlands (TFWs) are located in the upper 30 km. The Minho estuary is part of a Natura 2000 site, which includes the entire international section of the river being considered a very important river concerning migratory fish species. In the River Minho TFWs several fish species have ecological and economic value (Salmo trutta, Alosa fallax, Platichthys flesus, Anguilla anguilla, Salmo salar, Alosa alosa and Petromyzon marinus). European eel, A. anguilla, is in Appendix II of CITES list, that includes species not necessarily threatened with extinction, but in which trade must be controlled in order to avoid utilization incompatible with their survival. Between January 2007 and December 2014, in a selected semi-enclosed area of TFW and using 5 fyke-nets, were captured 1303 eels. All eels were measured and weighted, ocular index was determined and also marked with pit-tags and released in the same area. During these 8 years of work, around 15% of the total captured eels were recaptured once, less than 3% were recapture twice, less than 1% three times and 3 eels were recaptured 4 times. Eels marked in 2009 are until now the ones that were recaptured more times. Biological data as eel growth, seaward migration state, seasonal differences of by-catch will be crossed with abiotic data namely river flow, precipitation and water temperature. Keywords: European eel, Minho River, otoliths, mark-recapture, eel maturity Conference: XV European Congress of Ichthyology, Porto, Portugal, 7 Sep - 11 Sep, 2015. Presentation Type: Oral Presentation Topic: Life Cycles, Migration and Connectivity Citation: Correia H, Braga C, Araújo M, Souza AT and Antunes C (2015). Growth and seasonal behavior of Anguilla anguilla in the River Minho tidal freshwater wetlands. Front. Mar. Sci. Conference Abstract: XV European Congress of Ichthyology. doi: 10.3389/conf.fmars.2015.03.00119 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 22 Nov 2015; Published Online: 22 Nov 2015. * Correspondence: Dr. Carlos Antunes, CIIMAR, Porto, Please Select, 4005-123, Portugal, cantunes@ciimar.up.pt Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract Supplemental Data The Authors in Frontiers Helena Correia Catarina Braga Mário Jorge Araújo Allan T Souza Carlos Antunes Google Helena Correia Catarina Braga Mário Jorge Araújo Allan T Souza Carlos Antunes Google Scholar Helena Correia Catarina Braga Mário Jorge Araújo Allan T Souza Carlos Antunes PubMed Helena Correia Catarina Braga Mário Jorge Araújo Allan T Souza Carlos Antunes Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.