Spawning, fecundity and larval survival and growth in relation to controlled conditioning in native and transplanted populations of Pecten maximus (L.): evidence for the existence of separate stocks

Cochard, Jean-Claude; Devauchelle, Nicole

doi:10.1016/0022-0981(93)90042-m

Cited by 61 publications

(36 citation statements)

References 18 publications

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“…Another type of phenotypic variation, related to the timing of reproduction, has been observed between populations from Scotland, the Bay of Brest and the Bay of Saint Brieuc (France). Features of the reproductive cycle of transplanted scallops remained unchanged following population translocations, suggesting a genetic basis to these traits (Paulet et al 1988;Cochard and Devauchelle 1993;Mackie and Ansell 1993). A similar maintenance of the natural reproductive cycle has been reported in Norway with scallops transferred between populations along the coast (Magnesen and Christophersen 2008).…”

Section: Introductionmentioning

confidence: 52%

Genetic structure of a commercially exploited bivalve, the great scallop Pecten maximus, along the European coasts

Morvezen

Charrier²,

Boudry³

et al. 2015

Conserv Genet

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The great scallop Pecten maximus is harvested in several European countries and fisheries targeting this species are severely regulated by fishing quotas. In addition, hatchery-based population enhancement has been developed in some countries to provide alternative or complementary production. The genetic structure of wild populations of P. maximus and the potential impact of aquaculture on the genetic diversity of this species remains poorly documented. In this study, we explored the genetic structure of P. maximus using 12 microsatellite markers, considering 14 populations sampled from Galicia (Spain) to the North of Norway, and one population of Pecten jacobaeus (L., 1758) from the Lion Gulf (Mediterranean Sea). Results indicated a clear differentiation between Norwegian and Atlantic (from Ireland to Spain) populations, but very little to no difference between populations within these two groups. A decrease of the genetic diversity was observed with latitude. No significant reduction of the genetic diversity was observed in the Bay of Brest, where hatchery-based population enhancement has been performed intensively since 1983. Our results are discussed in the light of the inferred recent evolutionary history, phylogeography and connectivity of populations in Europe, and of the phenotypic variability reported in previous studies between northern and southern populations.

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Section: Introductionmentioning

confidence: 52%

Genetic structure of a commercially exploited bivalve, the great scallop Pecten maximus, along the European coasts

Morvezen

Charrier²,

Boudry³

et al. 2015

Conserv Genet

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“…The lack of significant differentiation of the St Brieuc scallops at the mtDNA level is surprising, if this population is indeed reproductively isolated as has previously been suggested (Paulet et al, 1988;Cochard & Devauchelle, 1993;Mackie & Ansell, 1993). If population differentiation is present, then mtDNA is expected to reveal more differences than allozymes owing to high variability and lowered effective population size, and failure to establish that differences are present questions whether the population is indeed genetically different.…”

Section: Discussionmentioning

confidence: 83%

Mitochondrial DNA variation in the scallop Pecten maximus (L.) assessed by a PCR-RFLP method

1997

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Two PCR-RFLP mitochondrial DNA (nitDNA) markers were developed through the cloning and sequencing of mtDNA from the scallop Pecten maximus, and were used to study genetic differentiation of UK and Atlantic coast populations of this species. Although no distinct pattern of mtDNA haplotype frequencies was apparent and no diagnostic haplotypes were identified for any population, sequence divergence data provided convincing evidence that a P maximus sample taken from Muiroy Bay, Eire, a semi-enclosed sea lough, was genetically differentiated from all other samples. However, this could not be unequivocally attributed to a restriction in gene flow, as the sample consisted of an ongrown single spatfall, which may not have been representative of the wild population. Despite the inability to separate populations on the basis of haplotype frequency, it was noteworthy that the frequency pattern of the commonest haplotype varied between sampling sites in a manner similar to that of allozyme allele frequencies in Aequipecten opercularis, a scallop species with a similar distribution and life history, for which there is evidence of population subdivision. Pecten maximus from St Brieuc Bay, reasoned to be a self-recruiting population from reproductive and physiological evidence, could not be separated froni other populations using mtDNA markers. Further investigation of this population with alternative markers is warranted.

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“…The SI and EH scallops were deployed separately in arrays and free-plant sectors because potential differences in genetic history of source broodstock populations (Cochard and Devauchelle 1993;Mackie and Ansell 1993) and/or differences in nutritional or other cultural conditions might have contributed to differences in survival, growth, or reproductive condition of our scallops following planting (Sekino 1992;Davidson 2000). Mean shell heights of scallops planted in 2005 and 2006 ranged from 35 to 40 mm.…”

Section: Deployment Of Bay Scallops In Spawner Sanctuariesmentioning

confidence: 99%

Utility of high-density plantings in bay scallop, Argopecten irradians irradians, restoration

Tettelbach

Barnes

Aldred³

et al. 2010

Aquacult Int

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Two different methods of establishing high-density spawner sanctuaries for bay scallop (Argopecten irradians irradians) restoration were evaluated over 2 years at a site in Northwest Harbor, East Hampton, New York, USA. Hatchery-reared scallops, which had been overwintered at nearby sites, were free-planted directly to the bottom in late March/ early April at an initial target density of 94-128 scallops/m 2 . In addition, scallops were stocked in off-bottom culture units consisting of three vertically stacked 15-mm mesh ADPI Ò bags at densities of 50, 100, or 200 scallops/bag (=117, 234, or 468 scallops/m 2 ), respectively. Survival of scallops differed significantly by year, planting method, and scallop source. Survival of free-planted scallops was generally lower than caged scallops. Better survival of free-planted scallops in 2005 versus 2006 likely reflected the presence of luxuriant eelgrass beds in 2005, which were absent in 2006. Survival of scallops in ADPI bags was not appreciably related to stocking density. Shell growth was highest for freeplanted scallops; in cages, growth was somewhat better at 50 versus 200 scallops/bag. Wet weights of epibionts were significantly higher in caged versus free-planted scallops. Reproductive condition of scallops stocked at 50/bag was usually higher than at 200/bag. Both free-planting and off-bottom systems yielded high densities of adult bay scallops at the time of spawning, which ensures a higher probability of successful fertilization of spawned eggs and thus a greater potential for success of restoration efforts.

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Spawning, fecundity and larval survival and growth in relation to controlled conditioning in native and transplanted populations of Pecten maximus (L.): evidence for the existence of separate stocks

Cited by 61 publications

References 18 publications

Genetic structure of a commercially exploited bivalve, the great scallop Pecten maximus, along the European coasts

Genetic structure of a commercially exploited bivalve, the great scallop Pecten maximus, along the European coasts

Mitochondrial DNA variation in the scallop Pecten maximus (L.) assessed by a PCR-RFLP method

Utility of high-density plantings in bay scallop, Argopecten irradians irradians, restoration

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