The Nile tilapia (Oreochromis niloticus) is a globally important aquaculture fish species, particularly in tropical and subtropical areas. However, aquaculture in many African countries including Ethiopia is not well developed. One of the main challenges for the development of aquaculture in Ethiopia is the lack of better performing Nile tilapia strain that can grow well in a wide range of production environments, and thus, it is crucial to develop fast growing Nile tilapia strain that can grow in a wide range of environments. Therefore, the main objectives of this study were to evaluate growth performance and genetic parameters such as heritability, additive genetic and genetic correlation of different strain combinations, and level of genotype by environment interaction (GxE) for harvest body weight (HBW) of 2409 fish from 81 full-sib families reared in high- (Hi-P) and low-input (Lo-P) pond-based production systems. The full-sib families were produced in a complete diallel cross of three Ethiopia Nile tilapia strains collected from Lake Chamo, Lake Koka, and Lake Ziway. After 5 months of rearing, HBW were measured and then phenotypic and genetic parameters were analyzed using univariate and bivariate animal models using SAS and ASReml softwares. The results of the study showed that the Chamo and the Koka strains and their crossbreds preformed significantly better than that of the Ziway strain and its crossbreds with the other two strains. The HBW of the fish obtained from the two production systems (111.4 g for Hi-P and 100.5 for Lo-P was not significantly different (P > 0.05).The heritability estimates from bivariate model were 0.23 and 0.20 for Hi-P and Lo-P, respectively. The heritability estimates of common full-sib for HBW of the fish reared in the Hi-P were higher (0.03) than found in the Lo-P (0.002). Re-ranking of the different strain combinations in the two production systems was observed. However, the high genetic correlation (0.95) and the non-significant (P > 0.05) GxE resulted in a weak re-ranking of strain combinations. In conclusion, the higher genetic correlation with low genotype by environment interaction between the harvest body weight of the fish reared in the two production systems indicated that environment-specific breeding program is not essential. However, the use of Hi-P prefereble.

尼罗罗非鱼（Oreochromis niloticus）是全球重要的水产养殖鱼类，特别是在热带和亚热带地区。但是，包括埃塞俄比亚在内的许多非洲国家的水产养殖业都不发达。埃塞俄比亚水产养殖发展的主要挑战之一是缺乏表现良好的尼罗罗非鱼品系，该品系可以在广泛的生产环境中良好生长，因此，至关重要的是要开发出可以在埃及尼罗河中生长的快速生长的尼罗罗非鱼品系。广泛的环境。因此，这项研究的主要目的是评估不同菌株组合的生长性能和遗传参数，例如遗传力，加性遗传和遗传相关性，环境相互作用（GxE）的基因型水平，以及在高（Hi-P）和低投入（Lo-P）池塘生产系统中养殖的81个全同胞家庭的2409条鱼的收获体重（HBW）。完全同胞家族是在从Chamo湖，Koka湖和Ziway湖收集的三种埃塞俄比亚尼罗罗非鱼菌株的完整直链杂交中产生的。饲养5个月后，测量HBW，然后使用SAS和ASReml软件使用单变量和双变量动物模型分析表型和遗传参数。研究结果表明，Chamo和Koka菌株及其杂交品种的表现明显优于Ziway菌株及其与其他两个菌株的杂交品种。从两种生产系统获得的鱼的HBW（Hi-P为111.4 g，100为。P  > 0.05）.Hi-P和Lo-P双变量模型的遗传力估计分别为0.23和0.20。在Hi-P饲养的鱼中，HBW的常见全同胞遗传力估计值比Lo-P（0.002）高（0.03）。观察到两个生产系统中不同菌株组合的重新排序。但是，高遗传相关性（0.95）和不显着（P  > 0.05）GxE导致菌株组合的重新排序较弱。总之，在两个生产系统中饲养的鱼的收获体重之间，由于环境相互作用而与低基因型具有较高的遗传相关性，这表明环境特异性育种程序不是必需的。但是，最好使用Hi-P。