Implications of Sea Bream and Sea Bass Escapes for Sustainable Aquaculture Management: A Review of Interactions, Risks and Consequences

Arechavala-López, Pablo; Toledo-Guedes, Kilian; Izquierdo-Gómez, David; Šegvić-Bubić, Tanja; Sánchez-Jérez, Pablo

doi:10.1080/23308249.2017.1384789

Cited by 45 publications

(41 citation statements)

References 106 publications

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“…The attraction effect of fish farms on wild fish populations (Dempster et al 2005, Šegvić-Bubić et al 2011c, Stagličić et al 2017 and the ecological and genetic impacts of escapees on wild counterparts (Rogdakis et al 2011, Šegvić-Bubić et al 2011a, Arechavala-Lopez et al 2013, Toledo-Guedes et al 2014a have been widely studied and provide the basis for recommendations to manage escape scenarios (Are cha vala-Lopez et al 2013, 2018a,b, Dempster et al 2018. External characteristics (e.g.…”

Section: Introductionmentioning

confidence: 99%

Morphological and ecophysiological adaptations of wild gilthead seabream Sparus aurata associated with tuna farms

Talijančić¹,

Šegvić-Bubić²,

Žužul³

et al. 2019

Aquacult. Environ. Interact.

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Morphological and ecophysiological traits of wild, farmed and wild farm-associated gilthead seabream Sparus aurata were used to assess the degree of phenotypic adaptation of the species to their respective environments. Geometric morphometrics revealed clear body shape differentiation amongst the 3 types of populations, whereby sig nificant differences were noted in head profile and the anterior-body region of the fish. Morphological resemblance was recorded among 2 gilthead seabream populations associated with tuna farms, indicating that they share the same phenotypic responsiveness pattern. Adaptation in reproductive investment strategy was observed in individuals from farm-associated origin, displaying the highest gonadosomatic index but lowest condition in comparison to their farmed and wild counterparts. Multinomial logistic regression revealed that sex change from male to female with increasing length was more pronounced in farm-associated fish than in farmed and and wild fish. These findings demonstrate a significant influence of the environmental factors inherent to tuna farms on the phenotypic characteristics of gilthead seabream, providing a basis for further research on the ecological effects of tuna farms on local marine populations.

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Section: Introductionmentioning

confidence: 99%

Morphological and ecophysiological adaptations of wild gilthead seabream Sparus aurata associated with tuna farms

Talijančić¹,

Šegvić-Bubić²,

Žužul³

et al. 2019

Aquacult. Environ. Interact.

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“…First, gilthead sea bream from Atlantic brood‐stocks are commonly bred in Mediterranean hatcheries because of their better growth performance and disease resistance (De Innocentiis et al, ; Miggiano et al, ). In addition to the nonlocal origin of some breeders, most breeding programmes use broodstocks of small size (100–200 individuals), on which artificial selection or genetic management are seldom carried out (Chavanne et al, ); thus, inbreeding and genetic drift can be expected to increase over time (Arechavala‐Lopez, Toledo‐Guedes, Izquierdo‐Gómez, Šegvić‐Bubić, & Sánchez‐Jerez, ). Moreover, individual‐based nonrandom breeding and high variance in family size occurring during mass‐spawning events can further reduce the broodstock effective population size (Cameron Brown, Woolliams, & McAndrew, ; Šegvić‐Bubić, Talijančić, Grubišić, Izquierdo‐Gomez, & Katavić, ).…”

Section: Introductionmentioning

confidence: 99%

Influence of genetic drift on patterns of genetic variation: The footprint of aquaculture practices in Sparus aurata (Teleostei: Sparidae)

et al. 2019

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Aquaculture finfish production based on floating cage technology has raised increasing concerns regarding the genetic integrity of natural populations. Accidental mass escapes can induce the loss of genetic diversity in wild populations by increasing genetic drift and inbreeding. Farm escapes probably represent an important issue in the gilthead sea bream (Sparus aurata), which accounted for 76.4% of total escapees recorded in Europe during a 3-year survey. Here, we investigated patterns of genetic variation in farmed and wild populations of gilthead sea bream from the Western Mediterranean, a region of long gilthead sea bream farming. We focused on the role that genetic drift may play in shaping these patterns. Results based on microsatellite markers matched those observed in previous studies. Farmed populations showed lower levels of genetic diversity than wild populations and were genetically divergent from their wild counterparts. Overall, farmed populations showed the smallest effective population size and increased levels of relatedness compared to wild populations. The small broodstock size coupled with breeding practices that may favour the variance in individual reproductive success probably boosted genetic drift. This factor appeared to be a major driver of the genetic patterns observed in the gilthead sea bream populations analysed in the present study. These results further stress the importance of recommendations aimed at maintaining broodstock sizes as large as possible and equal sex-ratios among breeders, as well as avoiding unequal contributions among parents. K E Y W O R D S aquaculture, conservation genetics, founder effect, genetic pollution, microsatellites, population effective size | 3013 COSSU et al.

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“…Despite the advantage of providing an alternative source of animal protein, negative environmental outcomes, such as land use for feed production (Froeh lich et al 2018) and the escape of domesticated fish (Glover et al 2017, Arechavala-Lopez et al 2018, are issues concerning aquaculture production. Genetic differentiation between farmed and wild fish rapidly increases in breeding due to genetic drift and selection (Janssen et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Tracing the genetic impact of farmed turbot Scophthalmus maximus on wild populations

Prado¹,

Vera²,

Hermida³

et al. 2018

Aquacult. Environ. Interact.

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The impact of escapees from aquaculture is of general concern for the sustainability of natural resources. Turbot Scophthalmus maximus is a marine flatfish of great commercial value whose land-based aquaculture started approx. 40 yr ago; hence, a low impact of escapees is expected on wild populations. However, enhancement of wild stocks using farmed turbot has been carried out along the Northeast Atlantic coasts in the last decades. Recently, a broad panel of single nucleotide polymorphism (SNP) markers (755 SNPs; 1 SNP Mb −1 ) has been used to evaluate the genetic structure of turbot throughout its distribution range, constituting the baseline to evaluate the impact of farmed fish in the wild. Two distinct origins were identified for farmed turbot (F _ORI1 and F _ORI2 ; F ST = 0.049), which differentiated from wild populations after 5 generations of selection (average F ST = 0.059), and consistent evidence of adaptation to domestication was detected. A notable proportion of fish of farmed ancestry was detected in the wild (15.5%), mainly in the North Sea, where restocking activities have taken place, determining genetic introgression in wild populations. Conversely, effects of land-based aquaculture appear negligible. A simulation exercise supported panels of 40 and 80 SNPs to identify fishes of F _ORI1 and F _ORI2 ancestry in the wild, respectively. Application to empirical data showed an assignment success (wild/farmed ancestry) of approx. 95% in comparison with the full SNP dataset. The SNP tools will be useful to monitor turbot of farmed ancestry in the wild, which might represent a risk, considering the lower fitness of farmed individuals.

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Implications of Sea Bream and Sea Bass Escapes for Sustainable Aquaculture Management: A Review of Interactions, Risks and Consequences

Cited by 45 publications

References 106 publications

Morphological and ecophysiological adaptations of wild gilthead seabream Sparus aurata associated with tuna farms

Morphological and ecophysiological adaptations of wild gilthead seabream Sparus aurata associated with tuna farms

Influence of genetic drift on patterns of genetic variation: The footprint of aquaculture practices in Sparus aurata (Teleostei: Sparidae)

Tracing the genetic impact of farmed turbot Scophthalmus maximus on wild populations

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