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  • Authors Marcalo, A; Katara, I; Feijo, D; Araujo, H; Oliveira, I; Santos, J; Ferreira, M; Monteiro, S; Pierce, GJ; Silva, A; Vingada, J
  • Author Full Name Marcalo, Ana; Katara, Isidora; Feijo, Diana; Araujo, Helder; Oliveira, Isabel; Santos, Jorge; Ferreira, Marisa; Monteiro, Silvia; Pierce, Graham J.; Silva, Alexandra; Vingada, Jose
  • Title Quantification of interactions between the Portuguese sardine purse-seine fishery and cetaceans
  • Nationality internacional
  • Source ICES JOURNAL OF MARINE SCIENCE
  • Language English
  • Document Type Article
  • Author Keywords bycatch; cetaceans; fisher behaviour; fishery interaction; Portuguese coast; purse-seine
  • Keywords Plus DOLPHINS DELPHINUS-DELPHIS; COMMON DOLPHINS; MARINE MAMMALS; BY-CATCH; WATERS; CONSERVATION; MANAGEMENT; BYCATCH
  • Abstract Interactions between cetaceans and the purse-seine fishery operating along the whole Portuguese continental coast were studied based on on-board observations from 2010 to 2011. Cetacean presence and mortality were estimated and characteristics under which interactions were most likely to occur were identified. Observations were made on 163 fishing trips (0.7% of the average annual number of fishing trips) and 302 fishing operations/hauls. Cetaceans were present during 16.9% of fishing events; common dolphins (Delphinus delphis) accounted for 96% of occurrences, mostly overnight in summer and early autumn. Regression models showed that cetacean presence during a fishing set was significantly (p < 0.05) associated with sardine catches, effort, and latitude/longitude. Encirclement and mortality occurred in 2.3 and 1.0% of fishing events, respectively. Encircled species were the common dolphin, bottlenose dolphin (Tursiops truncatus), and harbour porpoise (Phocoena phocoena), but only common dolphin showed mortality (three individuals); raised to fleet level, estimated total mortality rates of common dolphins were 69 (95% CI 37-110) in the north and 91 (95% CI 55-165) in the south for 2010 and 78 (95% CI 47-140) in the south only for 2011. The estimated annual mortality rate due to purse seining is 113 (95% CI 3-264) common dolphins, which is similar to 0.63% of the current most optimistic estimate of population size for the Portuguese fishing area (SCANS II). The wide confidence limits, as well as variation between years, reflect low observer coverage, emphasizing the need for increased monitoring to cover gaps in the spatial and seasonal distribution of observer effort and provide reliable estimates of bycatch.
  • Author Address [Marcalo, Ana; Monteiro, Silvia; Pierce, Graham J.; Vingada, Jose] Univ Aveiro, Ctr Environm & Marine Studies CESAM, P-3810193 Aveiro, Portugal; [Marcalo, Ana; Monteiro, Silvia; Pierce, Graham J.; Vingada, Jose] Univ Aveiro, Dept Biol, P-3810193 Aveiro, Portugal; [Marcalo, Ana; Araujo, Helder; Oliveira, Isabel; Santos, Jorge; Ferreira, Marisa; Monteiro, Silvia; Vingada, Jose] Univ Minho, CBMA, SPVS, Dept Biol, P-4710057 Braga, Portugal; [Katara, Isidora; Silva, Alexandra] IPMA, P-1449006 Lisbon, Portugal; [Feijo, Diana] IPMA, P-4450208 Matosinhos, Portugal; [Pierce, Graham J.] Univ Aberdeen, Oceanlab, Newburgh AB41 6AA, Aberdeen, Scotland
  • Reprint Address Marcalo, A (reprint author), Univ Aveiro, Ctr Environm & Marine Studies CESAM, Campus Univ Santiago, P-3810193 Aveiro, Portugal.
  • E-mail Address amarcalo@gmail.com
  • Funding Agency and Grant Number project SAFESEA EEAGrants; project Life + MarPro; European Commission [EC 2008/199]; Portuguese Foundation for Science and Technology [SFRH/BPD/64889/2009]
  • Funding Text We thank all the skippers and crewmembers of the purse-seiners in all the ports where observation trips took place for contributing with their knowledge and welcoming all the observers aboard. AM gratefully acknowledges N. Oliveira for extra guidance in the analysis and L. Nicolau for GIS mapping. This work was funded by the projects SAFESEA EEAGrants (2008-2010), Life + MarPro (2011-2015), and the European Commission's Data Collection Framework (Reg. EC 2008/199). Data also have been collected under PNAB/EU-DCF-Programa Nacional de Amostragem Biologica/EU-Data Collection Framework. AM is funded by a postdoctoral fellowship (SFRH/BPD/64889/2009) from the Portuguese Foundation for Science and Technology. Landings' data were kindly provided by Direccao-Geral de Recursos Naturais Seguranca e Servicos maritimos (DGRM). A special thank goes to two unknown reviewers whose comments contributed substantially to the improvement of the manuscript.
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  • Cited Reference Count 44
  • Publisher OXFORD UNIV PRESS
  • Publisher City OXFORD
  • Publisher Address GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
  • ISSN 1054-3139
  • Character Source Abbreviation ICES J MAR SCI
  • ISO Source Abbreviation ICES J. Mar. Sci.
  • Publication Date SEP-OCT
  • Year Published 2015
  • Volume 72
  • Issue 8
  • Beginning Page 2438
  • Ending Page 2449
  • Digital Object Identifier (DOI) 10.1093/icesjms/fsv076
  • Page Count 12
  • Web of Science Category Fisheries; Marine & Freshwater Biology; Oceanography
  • Subject Category Fisheries; Marine & Freshwater Biology; Oceanography
  • Document Delivery Number DB1EU
  • Unique Article Identifier WOS:000368251600025

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