Gebauer Tatyana, Gebauer Radek, Císař Petr, Tran Hung Quang, Tomášek Ondřej, Podhorec Peter, Prokešová Markéta, Rebl Alexander, Stejskal Vlastimil
South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Faculty of Fisheries and Protection of Waters, Institute of Aquaculture and Protection of Waters, University of South Bohemia in Ceske Budejovice, Husova tř. 458/102, 370 05 České Budějovice, Czech Republic.
Institute of Genome Biology, Research Institute for Farm Animal Biology (FBN), Wilhelm-Stahl-Allee 2, 18196 Dummerstorf, Germany.
Biology (Basel). 2021 Nov 10;10(11):1162. doi: 10.3390/biology10111162.
Restocking programmes of different fish species have been implemented worldwide. However, the survival of hatchery-reared fish after release to riverine ecosystems is at a very low level. One of the reasons for the high mortality rate of post-released fish is their modified swimming behaviour due to the hatchery rearing practice. To investigate one of the possible causes for modified swimming behaviour, larvae were exposed to surface- and bottom-feeding applications with day and night light regimes in a factorial design. We also analysed the effect of 5 and 10 days of starvation after different feeding applications on sturgeon swimming behaviour. The surface-feeding application was previously expected to promote the frequent Siberian sturgeon swim up to the mid- and top-water layers in our rearing facilities. However, our results indicated that the modified behaviour of the Siberian sturgeon in our study was caused by fish starvation and a possible predator-free environment rather than by the method of feed application or the day/night light regimes. These results may be used to improve the implementation of restocking programmes either through modified hatchery rearing practice or the training of foraging skills with predator stimuli.
世界各地都实施了不同鱼类的增殖放流计划。然而，孵化场养殖的鱼类放流到河流生态系统后的存活率非常低。放流后鱼类死亡率高的原因之一是由于孵化场养殖方式导致它们的游泳行为发生了改变。为了研究游泳行为改变的一个可能原因，采用析因设计，让幼鱼在昼夜光照条件下接受表层和底层投喂。我们还分析了不同投喂方式后5天和10天饥饿对鲟鱼游泳行为的影响。此前预计，在我们的养殖设施中，表层投喂方式会促使西伯利亚鲟频繁游到中上层水域。然而，我们的结果表明，我们研究中西伯利亚鲟行为的改变是由鱼类饥饿和可能的无捕食者环境引起的，而不是由投喂方式或昼夜光照条件引起的。这些结果可用于通过改进孵化场养殖方式或利用捕食者刺激训练觅食技能来改善增殖放流计划的实施。
