Geographical origin of individual breeders from gilthead sea bream (Sparus auratus) hatchery broodstocks inferred by microsatellite profiles

Innocentiis, Sabina De; Miggiano, Emanuela; Ungaro, Andrea; Livi, Silvia; Sola, Luciana; Crosetti, Donatella

doi:10.1016/j.aquaculture.2005.02.022

Cited by 20 publications

(16 citation statements)

References 21 publications

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“…; Launey et al . ; De Innocentiis et al ., and ; Alarcón et al ., 2004; Brown, Woolliams & McAndrew ; Borrell et al ., ). Although no information is available on the wild‐base population, we can suppose that the heterozygosity values did not change substantially since then.…”

Section: Resultsmentioning

confidence: 95%

Microsatellites markers to depict the reproductive and genetic patterns of farmed gilthead seabream (Sparus aurata): illustration by a case study on mass spawning

et al. 2012

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In the absence of breeding strategy, natural spawning constitutes the breeding ground for fish farmers to empirically manage their commercial broodstock. In this context, we used six microsatellite markers to characterize the genetic pattern of six commercial seabream broodfish tanks having a common history spanning four generations. The progeny of one tank single‐day mass‐spawning event, reared in two different environments, was used to estimate the genetic parameters for body weight. Limited genetic differentiation was observed among broodfish groups. A panel of nine loci allowed us to unambiguously assign 95.4% of the offspring (1692) and identify 37 parents (65% of the total broodfish). The limited effective population size (Ne = 15.3) was due to the elevated variance of parental contributions and to broodfish failing to contribute to the progeny. The fluctuation of the allele frequency highlighted the risks of genetic drift and reduction in the heterozygosity in the next generations. Heritability for body weight was moderate at commercial size (0.40 ± 0.10) and the high genetic correlation at later stages laid the groundwork for precocious selection criteria for growth. The discussion opens on the opportunity to use mass spawning for selective breeding.

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Section: Resultsmentioning

confidence: 95%

Microsatellites markers to depict the reproductive and genetic patterns of farmed gilthead seabream (Sparus aurata): illustration by a case study on mass spawning

et al. 2012

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“…The accidental escapement of individuals from sea farms is observed worldwide (De Innocentiis et al 2005), but in the Mediterranean very scarce and limited information is available. A significant number of individuals escaped during 1999–2005 after the partial or total damage of cages due to invasion of large pelagic species or adverse weather conditions.…”

Section: Discussionmentioning

confidence: 99%

Possible influence of reared gilthead sea bream (Sparus aurata, L.) on wild stocks in the area of the Messolonghi lagoon (Ionian Sea, Greece)

et al. 2007

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More than 25% of Greek fish farms and 20% of Greek hatcheries of gilthead sea bream (Sparus aurata) and sea bass (Dicentrarchus labrax) are located along the Western Hellenic coast. The part of sea bream production is about 60% of the total production of these species. During the last decade, a spectacular increase in both the number of farms and their production, accompanied by a substantial price decrease and modification of their structure and functioning, has been recorded. These changes resulted in the maintenance in cages of large individuals (more than 500 g) of gilthead sea bream which are potential spawners. The study, based on both the maturity stage and the decrease in individual mean weights during the reproductive period of the species, confirmed reproduction in cages. In parallel, during the last 5 years a remarkable increase (about 80%) in sea bream landings from the fish trap fisheries of the Messolonghi‐Etoliko lagoon, which is a typical nursery for the species, was recorded. The increase was accompanied by a decrease both in price and mean size of the 0‐group individuals. The possible influence of the rearing activities in the area, the density‐dependent mechanisms and the negative impacts of this unintentional enhancement of the traditional lagoon fisheries of the area are discussed.

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“…The common practice for farmers to use breeders of different geographic origin [35] might produce cultured seabream genetically very different from the local wild ones, as recently demonstrated by Alarcón et al [5]. Consequently, any accidental or deliberate introduction of hatchery samples in the wild represents a potential threat to the genetic integrity of natural populations.…”

Section: Discussionmentioning

confidence: 99%

Genetic structure of gilthead seabream, Sparus aurata, in the Central Mediterranean Sea

2006

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Abstract:The gilthead seabream, Sparus aurata, represents an important economic resource for Mediterranean aquaculture. In spite of its wide geographic distribution and economic importance, only recently studies have been carried out on the genetic composition of natural populations, which have revealed a picture of a heterogeneous degree of genetic differentiation among S. aurata populations. In this study an allozyme analysis of samples from six different collecting sites along the Italian and Croatian coasts was carried out, covering an area in the Central Mediterranean sea that has yet to be investigated through gene-enzyme systems. Data on 26 gene loci, 10 of which are polymorphic, indicate a slight but significant genetic structure (F ST = 0.0167) of the species. A hierarchical analysis of population subdivision made it possible to identify three different assemblages found in the Adriatic Sea, Tyrrhenian Sea and Sardinian Channel, though an isolation by distance model can be rejected. The results are discussed in the light of previous literature and taking conservation into consideration.

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Geographical origin of individual breeders from gilthead sea bream (Sparus auratus) hatchery broodstocks inferred by microsatellite profiles

Cited by 20 publications

References 21 publications

Microsatellites markers to depict the reproductive and genetic patterns of farmed gilthead seabream (Sparus aurata): illustration by a case study on mass spawning

Microsatellites markers to depict the reproductive and genetic patterns of farmed gilthead seabream (Sparus aurata): illustration by a case study on mass spawning

Possible influence of reared gilthead sea bream (Sparus aurata, L.) on wild stocks in the area of the Messolonghi lagoon (Ionian Sea, Greece)

Genetic structure of gilthead seabream, Sparus aurata, in the Central Mediterranean Sea

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