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ผู้เขียน หัวข้อ: Summer mortality of hatchery-produced Pacific oyster spat  (อ่าน 2123 ครั้ง)
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« เมื่อ: กุมภาพันธ์ 15, 2010, 08:34:52 PM »

Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas).
II. Response to selection for survival and its influence on growth and yield

Lionel Dégremont a,⁎, Edouard Bédier b, Pierre Boudry c
a IFREMER, Laboratoire de Génétique et Pathologie, F-17390 La Tremblade, France
b IFREMER, Laboratoire Environnement Ressources Morbihan Pays de Loire, Ifremer, F-56470 La Trinité, France
c IFREMER, UMR M100 Physiologie et Ecophysiologie des Mollusques Marins, Plouzané, France

Received 11 September 2008
Received in revised form 19 September 2009
Accepted 17 November 2009
Aquaculture (ARTICLE IN PRESS)

Keywords:
Crassostrea gigas
Heritability
Juveniles
Summer mortality
Survival
Growth


a b s t r a c t
Response to divergent selection for “high” and “low” survival during the summer period, from July to October, was investigated in juvenile (six-month-old) Pacific oysters, Crassostrea gigas, by producing two sets of progenies in 2002 (Generation 2) and three sets of progenies in 2003 (Generation 3). A strict between-family approach was used and resistance of these selected progenies to summer mortality was assessed in three sites along French coasts, to determine their response to selection and estimate realized heritability of the trait. A significant difference in survival was observed between the “high” and “low” selected groups at all sites for all sets of progenies, indicating a significant genetic component. High realized heritabilities for survival obtained from Generation 2 oysters, ranging from 0.61±0.08 to 0.98±0.15, were in line with previous results from the first generation. Finally, Generation 3 realized heritability, ranging from 0.55±0.18 to 0.81±0.13, supported results from Generation 2. Our results demonstrate that selective breeding to improve survival during the first summer can be successfully implemented and should lead to rapid gains. Overall, selection on survival did not have any impact on growth, although it did have one on yield.
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