Catla (Catla catla) and silver carp (Hypophthalmichthys molitrix) are globally significant aquaculture species, primarily grown in polyculture. The objectives of the current study were to i) quantify genetic differences among founder populations (i.e. genetic groups) of family-based genetic improvement programs ii) estimate genetic parameters for harvest weight under different culture systems (i.e. monoculture and biculture) and iii) determine the extent of genotype-by-culture-system interaction – a component of genotype-by-environment-by-management interaction. Founder parents were spawned to generate 188 catla and 184 silver carp base-population full-sibling families. Families were grown out in eight earthen ponds – two monoculture catla, two monoculture silver carp and four biculture – and harvest body weight and survival analysed. Neither interaction (i.e. heterosis) nor main effects among genetic groups were statistically significant in any pond, trait or species. Additive genetic variances were significantly different from zero in all but one pond in each species. Narrow-sense heritability estimates for harvest weight ranged from 0.06 to 0.44 for catla and from 0.18 to 0.51 for silver carp. In contrast to catla, silver carp inter-pond genetic correlations were significantly different from one in multiple cases, indicating the presence of genotype-by-pond interactions. However, these interactions were not entirely explained by genotype-by-culture-system interaction, given the genetic correlation between the monoculture ponds was 0.56 (P = 0.038; from one). Additive variances were not statistically significant for survival in either species, with the exception of silver carp in one polyculture pond. Notably catla harvest weight in monoculture ponds was substantially greater than in biculture ponds, indicating the presence of inter-species competition in biculture ponds.

鲢鱼( Catla catla ) 和鲢鱼 ( Hypophthalmichthys molitrix )) 是全球重要的水产养殖物种，主要在混养中种植。当前研究的目标是 i) 量化基于家庭的遗传改良计划的创始人群体（即遗传群体）之间的遗传差异 ii) 估计不同培养系统（即单养和双养）下收获重量的遗传参数和 iii) 确定基因型-培养-系统相互作用的程度——基因型-环境-管理相互作用的一个组成部分。始祖父母产生了 188 个卡特拉和 184 个鲢鱼基种群的全兄弟家庭。家庭在八个土池中长大——两个单一养殖鲶鱼、两个单一养殖鲢鱼和四个双养殖——并分析收获体重和存活率。既不交互（即 杂种优势）或遗传组之间的主要影响在任何池塘、性状或物种中均无统计学意义。除了每个物种的一个池塘外，所有池塘的加性遗传方差均显着不同于零。收获重量的狭义遗传力估计值在 catla 为 0.06 至 0.44 之间，对于鲢鱼为 0.18 至 0.51 之间。与 catla 相比，鲢鱼池塘间遗传相关性与多个案例中的一种显着不同，表明存在不同池塘的基因型相互作用。然而，考虑到单一养殖池塘之间的遗传相关性为 0.56（收获重量的狭义遗传力估计值在 catla 为 0.06 至 0.44 之间，对于鲢鱼为 0.18 至 0.51 之间。与 catla 相比，鲢鱼池塘间遗传相关性与多个案例中的一种显着不同，表明存在不同池塘的基因型相互作用。然而，考虑到单一养殖池塘之间的遗传相关性为 0.56（收获重量的狭义遗传力估计值在 catla 为 0.06 至 0.44 之间，对于鲢鱼为 0.18 至 0.51 之间。与 catla 相比，鲢鱼池塘间遗传相关性与多个案例中的一种显着不同，表明存在不同池塘的基因型相互作用。然而，考虑到单一养殖池塘之间的遗传相关性为 0.56（P  = 0.038; 从一个）。除一个混养池塘中的鲢鱼外，两个物种的加性差异对存活率均无统计学意义。值得注意的是，单养池塘中的catla收获重量大大高于双养池塘，表明双养池塘中存在物种间竞争。