Abstract Fish stocking is a common practice for compensation purposes for damages resulting from human impacts on aquatic ecosystems. The problem of the efficiency of stocking with hatchery-reared salmonids concerns many river catchments and populations around the world. Simultaneously, fish marking is a commonly used method to evaluate the effectiveness of undertaken restocking practices. In the present study, we compared some basic biological parameters of juveniles endemic lake-migratory brown trout (Salmo trutta lacustris L.), unmarked and marked as larvae with alizarin red S and released into the natural environment. As a result, no significant differences were observed in growth and abundance between the two groups of young-of-the-year trout in three consecutive seasons. However, there was notable differentiation in the overall condition and survival of juveniles between seasons, most likely as a result of streambed regulation. In addition, observed variations in specific growth rate could be affected by the size of fish before stocking. These results provide assumptions for restocking and recovery activities.

中文翻译：

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用茜素红 S 标记 Salmo trutta lacustris L. 幼虫对其后续生长、状况和自然流中幼鱼分布的影响

摘要 鱼类放养是一种常见的做法，用于补偿人类对水生生态系统的影响造成的损害。孵化场养殖的鲑鱼放养效率问题涉及世界各地的许多河流集水区和种群。同时，鱼类标记是一种常用的方法来评估所进行的再放养做法的有效性。在本研究中，我们比较了未标记和用茜素红 S 标记为幼虫并释放到自然环境中的地方性湖泊洄游褐鳟（Salmo trutta lacustris L.）幼鱼的一些基本生物学参数。结果，在连续三个季节中，两组年幼鳟鱼的生长和丰度没有显着差异。然而，不同季节之间，幼鱼的总体状况和存活率存在显着差异，这很可能是河床调节的结果。此外，观察到的特定增长率的变化可能会受到放养前鱼的大小的影响。这些结果为补货和恢复活动提供了假设。