Effects of wild fishes on waste exportation from a Mediterranean fish farm

Vita, Rubén; Marín, Antonio Riquelme; Madrid, Juan Antonio; Jiménez-Brinquis, B.; César, Augusto; Marín-Guirao, Lázaro

doi:10.3354/meps277253

Cited by 78 publications

(65 citation statements)

References 33 publications

(34 reference statements)

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“…For most of the studied aggregating species, it has been demonstrated that they change their diet while resident around farms (FernandezJover et al 2007, 2008) and help to reduce the impact on the benthic system. Thus, wild fish feeding around fish farms reduce the total waste that reaches the environment by 40 to 80% (Vita et al 2004, Felsing et al 2005. Consequently, as wild fish substitute their natural diet by an elevated proportion of food pellets, it was hypothesised that they may present alterations in their FA profiles in a similar way as happens to cultured species.…”

Section: Effects Of Lost Food Pellets On Wild Fish Fa Signaturementioning

confidence: 99%

Monitoring the influence of marine aquaculture on wild fish communities: benefits and limitations of fatty acid profiles

Fernandez‐Jover¹,

Arechavala-López²,

Martínez-Rubio³

et al. 2011

Aquacult. Environ. Interact.

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Fatty acids (FA) have been applied as indicators of the influence of coastal sea-cage fish farming on wild fish communities in several recent scientific publications. Due to the relatively high conservation of FA composition throughout the food web, they are useful for characterizing trophic relationships. The increasing utilization of vegetable or alternative animal oils in the production of aquafeeds results in cultivated fish exhibiting higher levels of terrestrial FAs in their tissues. As previously reported, wild fish ubiquitously aggregate around fish farms as a consequence of the introduction of new habitat and the easy availability of food—fish farms act as enhanced fish aggregation devices (FADs). The influence of food pellets on the composition of wild fish has been detected in recent studies on salmon, sea bass and sea bream aquaculture, with increased levels of linoleic acid (18:2n-6) and a low n-3/n-6 ratio as clear indicators of the consumption of food pellets from the farms. The potential ecological and physiological effects on wild fish are presently unknown. In the present article, guidelines are proposed for the investigation and use of terrestrial FAs to track the effects of coastal aquaculture on wild fish communities and local fisheries, as well as the benefits or limitations of this technique

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Section: Effects Of Lost Food Pellets On Wild Fish Fa Signaturementioning

confidence: 99%

Monitoring the influence of marine aquaculture on wild fish communities: benefits and limitations of fatty acid profiles

Fernandez‐Jover¹,

Arechavala-López²,

Martínez-Rubio³

et al. 2011

Aquacult. Environ. Interact.

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“…The Sedimentation trap samples were stored frozen for no longer than two months at -20 ºC and thawed for analysis. After centrifuging at 4°C for 10 min at 1000 g, the overlying water was carefully removed (Vita et al 2004). The settled particles were dried in an oven at 60 ºC to constant weight before being finely ground.…”

Section: Particulate Sedimentation Samplingmentioning

confidence: 99%

Relationship between sedimentation rates and benthic impact on Maërl beds derived from fish farming in the Mediterranean

Sanz‐Lázaro

Belando

Marín-Guirao

et al. 2011

Marine Environmental Research

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The aim of this work was to study the dispersion of particulate wastes derived from marine fish farming and correlate the data with the impact on the seabed. Carbon and nutrients were correlated with the physico-chemical parameters of the sediment and the benthic community structure. The sedimentation rates in the benthic system were 1.09, 0.09 and 0.13 g m Therefore, the level of fish farm impact on the benthic community might be underestimated if it is assessed by merely taking into account data obtained from waste dispersion rates. The benthic habitat beneath the fish farm, Maërl bed, was seen to be very sensitive to aquaculture impact compared with other unvegetated benthic habitats, with an estimated POC-carrying capacity to maintain current diversity of 0.087 g C m -2 day -1 (only 36% greater than the basal POC input). Environmental protection agencies should define different aquaculture waste load thresholds for different benthic communities affected by finfish farming, according to their particular degree of sensitivity, in order to maintain natural ecosystem functions.

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“…In parallel, consumption of lost food by wild fish may buffer the environmental impact on the benthos underneath farms (e.g. Lupatsch et al 2003, Vita et al 2004. Therefore, it has been argued that fish harvesting should be avoided in the vicinity of farms , in order to fully benefit from the recycling function of wild fish.…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal extension of wild fish aggregations at Sparus aurata and Thunnus thynnus farms in the north-western Mediterranean

Bacher¹,

Gordoa²,

Sagué³

2012

Aquacult. Environ. Interact.

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Fish farms cause wild fish to aggregate nearby and thus act to modify their distribution, but the spatial and temporal extent of the attraction effect around farms is still poorly understood. We examined attraction using an integrated approach combining 3 factors: spatial extent, depth and season. We analysed an Atlantic bluefin tuna Thunnus thynnus (ABT) and a gilthead seabream Sparus aurata (SB) farm off the north-eastern coast of Spain which represent different fish farming models in the Mediterranean. Underwater visual counts were conducted from summer 2010 to spring 2011. We recorded 39 species at the SB farm and 17 species at the ABT farm. The analysis of fish abundance and biomass at 3 stations located along a distance gradient from the farm (SB: 0, 30, 200 m; ABT: 0, 100, 200 m) showed significantly higher values next to the cages than at more distant stations, revealing that the spatial extent of the attraction effect was mainly restricted to the cage rather than following a gradient. The intensity of the cage effect varied according to farm, season and depth, reflecting species-specific behaviours. At the SB farm, the cage effect persisted year round, varying with depth, whereas at the ABT farm, the effect was only detected in summer and spring. These distinct spatial and temporal aggregation patterns suggest that implementation of fishery regulatory measures to protect wild fish should be farm-specific. This study emphasizes the importance of using an integrated approach to study wild fish aggregations at farms.

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Effects of wild fishes on waste exportation from a Mediterranean fish farm

Cited by 78 publications

References 33 publications

Monitoring the influence of marine aquaculture on wild fish communities: benefits and limitations of fatty acid profiles

Monitoring the influence of marine aquaculture on wild fish communities: benefits and limitations of fatty acid profiles

Relationship between sedimentation rates and benthic impact on Maërl beds derived from fish farming in the Mediterranean

Spatial and temporal extension of wild fish aggregations at Sparus aurata and Thunnus thynnus farms in the north-western Mediterranean

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