Blabolil P, Duras J, Jůza T, Kočvara L, Matěna J, Muška M, Říha M, Vejřík L, Holubová M, Peterka J
Biology Centre of the Czech Academy of Sciences, Institute of Hydrobiology, Na Sádkách 7, 370 05, České Budějovice, Czech Republic.
Faculty of Fisheries and Protection of Waters, South Bohemian Research Center of Aquaculture and Biodiversity of Hydrocenoses, Institute of Aquaculture and Protection of Waters, University of South Bohemia in České Budějovice, Husova tř. 458/102, 370 05, České Budějovice, Czech Republic.
J Fish Biol. 2018 May;92(5):1545-1559. doi: 10.1111/jfb.13610. Epub 2018 Apr 10.
A novel sampling scheme, using a combination of electrofishing, visual exploration by scuba divers, two types of fyke nets and longlines, was tested in four reservoirs (including their inlets and outlets) to monitor a population of burbot Lota lota. This was supplemented by fry trawling and vertical hydro-acoustics, to detect L. lota larvae in two deep reservoirs that have had a long-term stocking programme. The majority of the L. lota detected were juveniles, captured by electrofishing in the littoral zones of the reservoirs and in running waters. Older individuals were rarely captured with longlines or fyke nets in deeper zones or structured habitats within the reservoirs. A combination of multiple sampling methods provided an assessment of the whole population. Population establishment could not be demonstrated as the age structure of the sampled fish corresponded with that of the stocked fish. Low post-stocking survival, migratory behaviour, interactions with other species and warmer water temperatures are considered the potential drivers for unsuccessful establishment of L. lota populations in these reservoirs.
一种新的采样方案，结合了电捕鱼、水肺潜水员的目视探测、两种类型的刺网和延绳钓，在四个水库（包括其入口和出口）进行了测试，以监测江鳕种群。此外还进行了鱼苗拖网捕捞和垂直水声学探测，以在两个长期开展放流计划的深水水库中检测江鳕幼体。检测到的江鳕大多为幼鱼，通过在水库沿岸带和流水区域进行电捕鱼捕获。年龄较大的个体很少在水库较深区域或结构化栖息地用延绳钓或刺网捕获。多种采样方法相结合对整个种群进行了评估。由于采样鱼的年龄结构与放流鱼的年龄结构相符，因此无法证明种群已建立。放流后存活率低、洄游行为、与其他物种的相互作用以及水温升高被认为是这些水库中江鳕种群建立不成功的潜在驱动因素。
