不同群体鳙的生长性能与遗传分析

GROWTH PERFORMANCE AND GENETIC ANALYSIS OF DIFFERENT POPULATIONS OF BIGHEAD

1982至1986年,在上海与广东两地精养鱼池中,对来源于不同繁殖群体的鳙,即长江水系天然繁殖的鳙和人工繁殖的鳙,珠江水系天然繁殖的鳙和人工繁殖的鳙,用随机区组试验法观察比较了2龄和3龄阶段的生长速度。结果一致表明:在同一环境里,天然繁殖鳙比人工繁殖鳙长得快,长江天然繁殖鳙比珠江天然繁殖鳙长得快,长江人工繁殖鳙比珠江人工繁殖鳙长得快,差距约5％左右。方差组分和遗传相关分析进一步揭示,遗传因子在不同繁殖群体鳙的生长差异上起有重要作用。

From 1982 to 1986, the growth rates of two- and three-year-old bighead (Aristichthys nobilis) from different populations were compared in intensive grow-up ponds in Shanghai and Guangdong, using a random block design. The bighead populations studied were: the wild population from the Changjiang River, the hatchery population from the Changjiang River basin, the wild population from the Zhujiang River, and the hatchery population from the Zhujiang River basin. The results indicated that, cultured in the same environment, fish from the wild populations grew faster than those from the hatchery populations; fish from the wild population from the Changjiang River grew faster than those from the wild population from the Zhujiang River; fish from the hatchery population from the Changjiang River basin grew faster than those from the hatchery population from the Zhujiang River basin; the differences in growth rate were about 5%. Analyses of variance and genetic correlation further revealed that the genetic factor played an important role in causing the differences in growth rate among the different populations.