Bottlenose dolphins and aquaculture: interaction and site fidelity on the north-eastern coast of Sardinia (Italy)

López, Bruno Díaz

doi:10.1007/s00227-012-2002-x

Cited by 46 publications

(43 citation statements)

References 32 publications

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“…) or noise produced by farm workers, boats and aquaculture machinery. These results are in agreement with other studies suggesting that bottlenose dolphins in the Mediterranean have become increasingly accustomed to foraging in the proximity of coastal fish farms (Díaz López, 2006López, , 2012Díaz López and Bernal Shirai, 2007;Bearzi et al, 2008b;Piroddi et al, 2010;Pace et al, 2012). This behaviour is probably a response of an opportunistic dolphin species (Shane et al, 1986;Leatherwood and Reeves, 1990;Reynolds et al, 2000) to novel foraging opportunities provided by a growing aquaculture industry, that makes it easier for the animals to exploit a concentrated food source, similar to cases involving trawling (Fertl and Leatherwood, 1997;Chilvers et al, 2003;Ansmann et al, 2012).…”

Section: Discussionsupporting

confidence: 93%

“…For instance, a study in the central Mediterranean reported a few cases of bottlenose dolphins 'biting the nets of the cages, causing direct damage to farmed fish as they attempted to remove them' and 'damaging the nets in the form of small holes' (Díaz López, 2006, p. 308). The subsequent deployment of anti-predator nets caused dolphin mortality (Díaz López and Bernal Shirai, 2007;Díaz López, 2012). In addition, dolphins may be blamed for causing stress to the farmed fish, although there is no evidence to support such claims (Díaz López, 2006;Bearzi et al, 2008b).…”

Section: Discussionmentioning

confidence: 99%

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Fish farming and its appeal to common bottlenose dolphins: modelling habitat use in a Mediterranean embayment

Bonizzoni

Furey

Pirotta

et al. 2013

Aquatic Conservation

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1. Common bottlenose dolphins Tursiops truncatus interact with fish farms in the Mediterranean Sea. These interactions were investigated in a Greek bay by incorporating multiple geographic, bathymetric, oceanographic, and anthropogenic variables. 2. Generalized additive models (GAMs) and generalized estimation equations (GEEs) were used to describe dolphin presence. Visual surveys were conducted over 2909 km under favourable viewing conditions that included 54 dolphin group follows for 457 km. Sea surface temperature (SST) and chlorophyll‐a (Chl‐a) data were obtained from remote sensing imagery, and distances to sources of human influences including fish farms, a ferro‐nickel plant, and a slag disposal area were calculated within a geographic information system (GIS). 3. Bottlenose dolphins were encountered mainly in the south‐eastern portion of the study area, and occurrence was not clearly related to SST and Chl‐a, nor the ferro‐nickel plant or nearby slag disposal area. 4. Dolphin occurrence generally increased within 20 km of fish farms, with four farms and dolphins displaying a positive relationship, seven no clear relationship, and two a negative one. 5. While it is likely that uneaten food and other detritus attract dolphin prey, individual farms (or clusters of farms) clearly had a different appeal. The proximity of the ferro‐nickel plant and slag disposal area to ‘attractive’ fish farms could compromise dolphin health, but physiological data are unavailable. 6. The modelling of multiple variables allowed for a description of dolphin habitat use and attraction to some fish farms. More such data analysed in similar manner would be instructive for other areas where marine mammals and fish farms co‐occur. Copyright © 2013 John Wiley & Sons, Ltd.

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Section: Discussionsupporting

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Fish farming and its appeal to common bottlenose dolphins: modelling habitat use in a Mediterranean embayment

Bonizzoni

Furey

Pirotta

et al. 2013

Aquatic Conservation

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“…Findings of this study report a higher occurrence of bottlenose dolphins within the Gulf of Olbia, and more particularly in the Aranci Bay, a zone clearly affected by marine fin-fish aquaculture and gill-net fisheries (Díaz López 2006a,b, 2012. Human activities, more particularly coastal fisheries and fin fish aquaculture in the Gulf of Olbia, could have fragmented and made certain zones more attractive to this marine top predator (Díaz López 2006a, Díaz López 2017.…”

Section: Discussionmentioning

confidence: 88%

“…Having a near-shore and behavioural plasticity, the common bottlenose dolphin Tursiops truncatus (Montagu 1821), hereafter bottlenose dolphin, has often been reported to exploit anthropogenic food sources (Corkeron et al 1990, Fertl and Leatherwood 1997, Pace et al 1999, Svane 2005, Díaz López 2006a. However, although diet (Santos et al 2007), habitat use (Svane 2005, Díaz López 2012, and social structure (Díaz Shirai 2008, Ansmann et al 2012) have been associated with access to anthropogenic resources, the prolonged influence of these resources on migratory patterns and social interactions has so far received limited attention. The lack of this significant information hampers our ability to evaluate the impact of anthropogenic activities on this potentially vulnerable marine top predator (DeMaster et al 2001, Bearzi et al 2008.…”

Section: Introductionmentioning

confidence: 99%

“Hot deals at sea”: responses of a top predator (Bottlenose dolphin,Tursiops truncatus) to human-induced changes in the coastal ecosystem

López¹

2018

Behavioral Ecology

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“…In prawn trawl fisheries, for example, dolphins were regularly observed following trawler vessels to forage on discarded fish [35–37]. Also, dolphin presence increased near fish farms since they aggregate more prey, making it more energetically efficient for animals to spend time in that area [38, 39]. …”

Section: Discussionmentioning

confidence: 99%

Predicting Interactions between Common Dolphins and the Pole-and-Line Tuna Fishery in the Azores

et al. 2016

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Common dolphins (Delphinus delphis) are responsible for the large majority of interactions with the pole-and-line tuna fishery in the Azores but the underlying drivers remain poorly understood. In this study we investigate the influence of various environmental and fisheries-related factors in promoting the interaction of common dolphins with this fishery and estimate the resultant catch losses. We analysed 15 years of fishery and cetacean interaction data (1998–2012) collected by observers placed aboard tuna fishing vessels. Dolphins interacted in less than 3% of the fishing events observed during the study period. The probability of dolphin interaction varied significantly between years with no evident trend over time. Generalized additive modeling results suggest that fishing duration, sea surface temperature and prey abundance in the region were the most important factors explaining common dolphin interaction. Dolphin interaction had no impact on the catches of albacore, skipjack and yellowfin tuna but resulted in significantly lower catches of bigeye tuna, with a predicted median annual loss of 13.5% in the number of fish captured. However, impact on bigeye catches varied considerably both by year and fishing area. Our work shows that rates of common dolphin interaction with the pole-and-line tuna fishery in the Azores are low and showed no signs of increase over the study period. Although overall economic impact was low, the interaction may lead to significant losses in some years. These findings emphasize the need for continued monitoring and for further research into the consequences and economic viability of potential mitigation measures.

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Bottlenose dolphins and aquaculture: interaction and site fidelity on the north-eastern coast of Sardinia (Italy)

Cited by 46 publications

References 32 publications

Fish farming and its appeal to common bottlenose dolphins: modelling habitat use in a Mediterranean embayment

Fish farming and its appeal to common bottlenose dolphins: modelling habitat use in a Mediterranean embayment

“Hot deals at sea”: responses of a top predator (Bottlenose dolphin,Tursiops truncatus) to human-induced changes in the coastal ecosystem

Predicting Interactions between Common Dolphins and the Pole-and-Line Tuna Fishery in the Azores

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