HETEROSIS IN EARLY GROWTH STAGE OF HONG KONG OYSTER CRASSOSTREA HONGKONGENSIS HYBRIDIDS FROM TWO GEOGRAPHICAL POPULATIONS
GUAN Jun-Liang;ZHANG Yue-Huan;SU Jia-Qi;XIAO Shu;ZHANG Ming;LI Qiong-Zhen;YU Zi-Niu;State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Animal Reproduction Institute, Guangxi University;Key Laboratory of Tropical Marine Biological Resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences;Key Laboratory of Mariculture Ministry of Education,Fisheries College, Ocean University of China;Key Laboratory of Mariculture, Guangxi Academy of Fishery Science;
To evaluate heterosis in early growth stage of Hong Kong oyster Crassostrea hongkongensis hybrids between two geographical populations(Zhuhai: Z, Maowei Sea: M), a 2×2 diallel crossing was conducted in May 2014, including two self-fertilized groups(MM, ZZ) and two reciprocal crosses(MZ, ZM). Results show that there was no growth heterosis before Day 9, but positive heterosis was observed on day 12 for MZ group with survival heterosis. However, positive heterosis in growth and survival appeared in ZM group during plantonic stage. At spat stage, positive growth and survival heterosis were 7.86±3.12 and 17.47±13.14 for MZ group, and 8.33±1.41 and 2.86±1.08 for ZM group, respectively. The above results indicate that heterosis can be produced from different populations, which offered a theory to use the heterosis for Hong Kong oyster culture.