马氏珠母贝亲代选择对子一代的影响

研究了马氏珠母贝不同亲本规格对后代的影响,以期为育种和苗种生产中的亲贝选择提供科学的理论指导。试验从来自同一养殖群体的2000个随机个体马氏珠母贝中选取规格最大（壳长55.89±1.65mm）、中等（壳长48.55±0.81mm）、最小（壳长42.22±2.51mm）的性成熟个体各50个作为亲贝（♀∶♂=1∶1）,按规格分成大、中、小3组,分别进行各组内亲本个体群交,在相同环境及试验条件下分析亲本选择对子代生产性能的影响。结果表明,大规格亲贝优于中规格亲贝（P〈0.05）;中规格亲贝优于小规格亲贝（P〈0.05）;马氏珠母贝亲代选择对子一代生产性能具有显著影响（P〈0.05）。这表明马氏珠母贝大规格亲贝群交后代表现出明显的生长优势,截断选择策略有效。

The Effect of Parental Selection on First Filial Generation of Pinctada martensii Dunker

In order to provide science theoretical reference for the breeding and seedling production of Pinctada martenaii （ Dunker）, the effect of parental selection on first filial generation was studied. In the experiment the same culture population of 2000 individuals ofPinctada martensii （Dunker） was divided into 3 groups according to shell length： large group （shell length 55. 89 ± 1.65mm）, middle group （ shell length 48.55 ± 0. 81 ram） and small group （ shell length 42. 22 ± 2. 51 nun）, and 50 individuals （♀∶♂ = 1 ： 1 ）, which as parents were sexually matured and of the same age, were chosen from 3 groups, respectively. Group mating experiments were carried out within each group of parents selected, respectively. Under identical environmental and experimental conditions, selection on the growth performance of group - fertilized progeny was examined. Results showed that large - size parents were better than middle ones （ P 〈 0. 05 ） ; middle - size parents were superior to small - size ones （ P 〈 0. 05 ） ; parental selection of Pinctada martensii （Dunker） had significant effect on the growth performance of group - fertilized progeny （ P 〈 0. 05 ）. This show that the group - fertilized progeny of large - size parents displayed marked growth ad- vantage, and the strategy of truncation selection is effective and should be adopted practically.