关键词: 凡纳滨对虾；群体选育；子代；免疫, Litopenaeus vannamei；selection breeding；offspring；immunology

Abstract: The immune indices of detection and analysis on inbred and hybrid offspring within stock F2A throngh artificial selection and inbred during two successive generations was carried out in group selection breeding study of Litopenaeus vannamei. The results showed that many immune indices in group F3A and F4A of inbred offsprings were higher than the other mating groups in the same generation, including the phagocytic activity in the hemocytes for group F3A and F4A was 14.8% to 64.3% and 27.0% to 44.8% higher than the other groups, respectively. The cytolytic activity in the serotonin for group F3A and F4A was 76.3% to 74.6% and 36.5% to 58.3% higher than the other groups with the same generation. Serum protein levels was also higher than other groups, but only the index of prophenol oxidase was lowest. The results indicated that inbred of Litopenaeus vannamei may be benefit for heredity in immune. But heterosis of hybrid group in the growth rate and resistance was not consistent with its low immune indices.