Interaction between bottlenose dolphins (Tursiops truncatus) and artisanal fisheries in the Valencia region (Spanish Mediterranean Sea). (1st November 2018)

• Record Type: Journal Article
• Authors: Revuelta, O.; Domènech, F.; Fraija-Fernández, N.; Gozalbes, P.; Novillo, O.; Penadés-Suay, J.; Tomás, J.
• Is Part Of: Ocean & coastal management. Volume 165(2018)
• Page Start: 117
• Page End: 125
• Publication Date: 2018-11-01
• Subjects: Artisanal fisheries -- Bottlenose dolphin -- Tursiops truncatus -- Mediterranean Sea -- Local Ecological Knowledge (LEK); Marine resources -- Management -- Periodicals; Coastal zone management -- Periodicals; Coastal ecology -- Periodicals; Ressources marines -- Périodiques; Littoral -- Aménagement -- Périodiques; Écologie littorale -- Périodiques; Coastal ecology; Coastal zone management; Marine resources -- Management; Periodicals; Electronic journals; 551.46
• DOI: 10.1016/j.ocecoaman.2018.08.001
• Languages: English
• ISSNs: 0964-5691

Abstract

Abstract: Coastal waters of the Valencia region are important habitats for bottlenose dolphins, but also important fishing grounds for artisanal fisheries. No studies have been carried out here to investigate the overlap and interactions between the fishing grounds and dolphin habitat. The present study aims to assess the potential occurrence of interactions between artisanal fisheries and bottlenose dolphins in these waters. Face to face interviews were conducted to investigate for the first time artisanal fishermen's perceptions of their interactions with bottlenose dolphins. A total of 131 fishermen (40.1% of the artisanal fleet for the Valencia region) participated of research. Among the interviewed fishermen, 86.1% perceived that dolphins damaged fishing gear as they attempted to feed, and they also detected significant direct damage to fish. Of all fishermen reporting a negative interaction with bottlenose dolphins, 76.3% also reported financial loss (2907.1 ± 2512.7 €/year (100–12, 000). Despite the high level of interaction with dolphins reported, fishermen do not consider bycatch to be an important threat for bottlenose dolphins. Our results show geographical differences in fishermen's perceptions of damage caused by dolphins: while dolphins were considered to be the second cause of economic loss in the southernmost ports, fishermen from the northern ports considered interaction with bottom trawl boats to be more harmful than interaction with dolphins. The more intense interaction reported by fishermen in fishing ports in the southern study area may be associated with higher presence of bottlenose dolphin in these zones. Our study provides a useful insight into fishermen's perceptions of interaction between bottlenose dolphins and artisanal fisheries in this key area for the species in the western Mediterranean Sea. It also highlights the need for future work including direct observations of interactions and damage to gather reliable data to assess the need for conservation measures. Highlights: Artisanal fisheries fishing grounds and bottlenose dolphin habitat overlap in Valencia region. Fishermen claim that dolphins cause damage that entails economic loss. Fishermen does not perceive bycatch as a negative aspect of fisheries on bottlenose dolphin. Differences in interaction perception among ports seems related to dolphin distribution. Future direct measures are necessary to validate fishermen perceptions previous to any management implementation.