中文摘要：

本文以香港巨牡蛎（Crassostreahongkongensis）和太平洋牡蛎（C．gigas）为研究对象，进行牡蛎异源三倍体研究试验。在水温25℃条件下，香港巨牡蛎剥离卵子于海水中浸泡促熟1.5h后，与太平洋牡蛎精子受精，获得最高卵裂率为（24.40±3.79）％。受精后20min，采用盐度为10的低渗海水处理杂交受精卵25rain，可获得68.65％的异源三倍体幼虫，孵化率为12.71％。异源三倍体幼虫的存活率和生长率均未表现出优势。受精后第9天，异源三倍体幼虫的存活率仅为（O．116土0．023）％，平均壳长为（103.50±0.85）（m；对照组的存活率和壳长分别为（42.17士2.74）％和（123.25±8.60）μm。幼虫在附着变态前死亡。

英文摘要：

Prior to the allotriploid induction, the feasibility of fertilization between Cras-sostrea hongkongensis （Lain and Morton, 2003） eggs and C. gigas （Thunberg, 1973） sperm had been verified before. Results showed that cleavage rate of （24.40±3.79）% of the inter-specific hybrid can be received with the eggs immersed in 25℃ seawater for 1.5h. The zy-gotes treated for 25 rain with a hypotonic solution of 10 salinities at 20rain after fertilization can yield the highest triploidy rate of 68.65% and the hatchery rate of 12.71%. No statisti-cal advantages of growth rate and survival rate were found in allotriploid group compared with control group. The survival rate and shell length of allotriploid group were （0. 116±0. 023）% and （103.50±0.85）ptm at the 9th day after and shell length of control group were （42.17±2. riploid hybrid larvae died before metamorphism. insemination. However, the survival rate 74）% and （123.25±8.60）ttm. All allot-