The aim of the present study was to estimate and compare the growth and survival traits of the hybrids and purebreds produced by crossing the Siberian sturgeon (Acipenser baerii) (S) and sterlet (Acipenser ruthenus) (St) in order to determine the heterosis effect in the F1 generation. We compared the breeding conditions, mean body weight (BW) and cumulative survival in the artificially produced hybrid crosses of sterlet and Siberian sturgeon with respect to their pure parental species in indoor and outdoor aquaculture systems at different developmental stages. Fertilization and hatching rates were found to be significantly higher in S × S purebred compared to St × S hybrid. The highest values of BW were recorded in St × S hybrid (557.54 ± 179.7 g) on 862 days post‐hatch (dph) while the highest cumulative survival was recorded in S × S purebred (14.3%). The recorded cumulative survival and mean BW was significantly lower in St × St purebred. The highest positive heterosis was recorded for mean BW of St × S hybrid (51.3% on 862 dph) throughout the sampling points. The studied sturgeon hybrids had higher mean BW compared to St × St purebred under suboptimal rearing conditions. Although there was no clear demonstration of the superiority in performance of reciprocal hybrids over purebreds, the St × S hybrid can be used for achieving better productivity in aquaculture systems.

中文翻译：

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小鲟和西伯利亚鲟纯种和杂交种生长和存活性状的杂种优势估计

本研究的目的是估计和比较西伯利亚鲟（Acipenser baerii）（S）和鲟（Acipenser ruthenus）（St）杂交产生的杂种和纯种的生长和存活性状，以确定杂种优势效应在 F1 一代。我们比较了人工生产的小鲟和西伯利亚鲟杂交杂交种在不同发育阶段的室内和室外水产养殖系统中与其纯亲本物种的繁殖条件、平均体重 (BW) 和累积存活率。与 St × S 杂种相比，S × S 纯种的受精率和孵化率显着更高。在孵化后 862 天 (dph) 记录了 St × S 杂种 (557.54 ± 179.7 g) 的最高体重值，而 S × S 纯种 (14. 3%）。在 St × St 纯种中，记录的累积存活率和平均 BW 显着较低。在整个采样点记录了 St × S 杂种的平均体重（862 dph 上的 51.3%）的最高正杂种优势。在次优饲养条件下，与 St × St 纯种鲟相比，所研究的鲟杂种具有更高的平均体重。虽然没有明确证明互惠杂种在性能上优于纯种，但 St × S 杂种可用于在水产养殖系统中实现更高的生产力。在次优饲养条件下，与 St × St 纯种鲟相比，所研究的鲟杂种具有更高的平均体重。虽然没有明确证明互惠杂种在性能上优于纯种，但 St × S 杂种可用于在水产养殖系统中实现更高的生产力。在次优饲养条件下，与 St × St 纯种鲟相比，所研究的鲟杂种具有更高的平均体重。虽然没有明确证明互惠杂种在性能上优于纯种，但 St × S 杂种可用于在水产养殖系统中实现更高的生产力。