吉富罗非鱼抗病品系F_5代抗病性能和生长性能的评估  

Estimation of disease resistance and growth in F_5 generation families of GIFT tilapia

作　　者：沈夏霜 敖秋桅 甘西 谭芸 罗永巨 梁军能 朱佳杰 SHEN Xiashuang, AO Qiuwei, GAN Xi, TANG Yun, LUO Yongju, LIANG Junneng, ZHU Jiajie(Guangxi Key Laboratory of Aquatic Genetic Breeding and Healthy Aquaculture, Guangxi Academy of Fishery Sciences,Nanning 530021, Chin)

机构地区：[1]广西壮族自治区水产科学研究院广西水产遗传育种与健康养殖重点实验室,广西南宁530021

出　　处：《南方水产科学》2018年第3期83-90,共8页South China Fisheries Science

基　　金：广西重点研发计划项目(桂科AB16380077);广西科技重大专项课题(桂科AA17204080-2);广西区水产畜牧兽医局科研计划项目(桂渔牧科201633036);国家特色淡水鱼产业技术体系(CARS-46);广西八桂学者建设工程专项经费(桂科政字[2013]25号)

摘　　要：为评估吉富罗非鱼(GIFT Oreochromis niloticus)抗病F5代的选育效果,以F0代群体和奥尼罗非鱼(Oreochromis aureus×O.niloticus)作为对照组,对F_5代42个家系的抗病性能及生长性能进行评估。对42个家系进行人工腹腔注射感染无乳链球菌(Streptococcus agalactiae)后,分别有36个和22个家系的感染成活率比F0代和奥尼罗非鱼高,各家系的抗病育种值为–0.158~0.086;生长性能测定发现,42个家系中有27个家系的绝对增长率大于F_0代;感染成活率与体质量之间的遗传相关系数为–0.033。综合分析各个家系的感染成活率、抗病育种值和绝对增长率,筛选出抗病力强且生长速度快的家系7个(2~#、3~#、4~#、6~#、28~#、31~#和35~#),可作为F6代选育和苗种扩繁的亲本。结果表明,经过5个世代的针对性选育,吉富罗非鱼的抗病性能和生长性能均得到了明显改善,选育效果显著。To assess the effects of selective breeding in GIFT tilapia（Oreochromis niloticus）, we measured the disease resistance and growth performance of 42 families of GIFT tilapia F_5 generation, taking F_0 generation and hybrid tilapia（Oreochromis aureus×O.niloticus） as control groups. The results show that the survival rates of 36 families of F_5 generation were higher than that of F_0 generation, and the survival rates of 22 families were higher than that of hybrid tilapia after Streptococcus agalactiae infection.The disease-resistant breeding value was – 0.158 – 0.086 among different families. The absolute growth rates of 27 families were higher than that of F_0 generation. The correlation coefficient between the survival rate and the body mass was negative, and the quantitative value was – 0.033. According to the comprehensive comparison among the survival rate, disease-resistant breeding value and absolute growth rate for 42 families of F_5 generation, we have screened seven families（2^#, 3^#, 4^#, 6^#, 28^#, 31^#, 35^#） which were best-performing and can be used as breeding parents of F_6 generation. The results indicate that the disease resistance and growth performance of GIFT tilapia were improved significantly after five generations＇ selective breeding.

关 键 词：吉富罗非鱼 家系选育 抗病性能 生长性能 育种值 

分 类 号：S961[农业科学—水产养殖]