Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas). II. Response to selection for survival and its influence on growth and yield
Summer mortality of hatchery-produced Pacific oyster spat (Crassostrea gigas). II. Response to selection for survival and its influence on growth and yield
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DOI：
10.1016/j.aquaculture.2009.11.017
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发表时间：
2010-02-01
期刊：
影响因子：
4.5
通讯作者：
Boudry, Pierre
中科院分区：
文献类型：
--
作者：
Degremont, Lionel;Bedier, Edouard;Boudry, Pierre
在夏季（7月至10月），通过在2002年生产两对后代（第2代）和2003年生产三对后代（第3代），研究了6个月大的太平洋牡蛎幼崽（长牡蛎）对“高”和“低”生存的不同选择的反应。采用严格的家族间方法，在法国沿海的三个地点评估了这些选择的后代对夏季死亡的抗性，以确定它们对选择的反应并估计该性状的实现遗传力。在所有子代的所有位点的“高”和“低”选择组之间观察到生存率的显着差异，表明显着的遗传成分。从第二代牡蛎获得的较高的生存实现遗传力范围为0.61 +/- 0.08至0.98 +/- 0.15，与第一代的结果一致。第三代的遗传力范围为0.55 +/- 0.18 ~ 0.81 +/- 0.13，支持了第二代的结果。我们的研究结果表明，在第一个夏天提高存活率的选择性育种是可以成功实施的，并且应该会带来快速的收益。总体而言，尽管对产量有影响，但对生存的选择对生长没有任何影响。(C) 2009 Elsevier B.V.版权所有
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. (C) 2009 Elsevier B.V. All rights reserved.