Telemetry and environmental data for European grayling movement in the Vöckla River, Austria

Study aims & design
We radio-tagged 147 European grayling (Thymallus thymallus) in the lowest 3 km of the River Vöckla, Upper Austria, upstream of its confluence with the River Ager. Fish were surgically implanted with individually coded NanoTags (Lotek NTF-3-2, 150.360 MHz) to compare movement behaviour and survival among three groups: (i) hatchery-reared fish acclimatised in perforated steel river cages for one week prior to release (n = 40), (ii) hatchery-reared fish released directly without acclimatisation (n = 50), and (iii) wild fish captured by electrofishing from the study reach (n = 57). All fish were released simultaneously on 16 April 2025. Fish were monitored over 14 weeks (April–July 2025) and 33 mobile tracking surveys conducted by cycling along the riverbank.

Files included:
voeckla_fish_daily_positions.csv — Daily position data per individual, including fish group, relative position along the river (m from release site), and tracking datevoeckla_daily_water_level.csv — Daily mean water level from the Vöcklabruck gauging stationvoeckla_daily_water_temperature.csv — Daily mean water temperature from the Vöcklabruck gauging stationvoeckla_fish_body_measurements.xlsx — Total length (cm) and weight (g) per tagged individual

研究目标与设计
我们在奥地利上奥地利州福克拉河（River Vöckla）与阿格河（River Ager）汇流点上游的最下游3公里河段内，对147尾欧洲茴鱼（Thymallus thymallus）开展了无线电标记试验。通过手术为试验鱼植入个体编码型NanoTags（Lotek NTF-3-2，150.360 MHz），以对比三组鱼类的运动行为与存活率：(i) 放流前在带孔钢制河道网箱中驯化一周的人工繁育鱼类（样本量n=40）；(ii) 未经驯化直接放流的人工繁育鱼类（n=50）；(iii) 从研究河段通过电渔法捕获的野生鱼类（n=57）。所有试验鱼于2025年4月16日同步放流。试验监测周期为14周（2025年4月至7月），通过沿河岸骑行完成了33次移动追踪调查。

包含文件：
voeckla_fish_daily_positions.csv — 单尾个体每日位置数据，包含鱼类组别、沿河相对位置（距放流点的米数）及追踪日期
voeckla_daily_water_level.csv — 福克拉布吕克（Vöcklabruck）水文站的日平均水位数据
voeckla_daily_water_temperature.csv — 福克拉布吕克水文站的日平均水温数据
voeckla_fish_body_measurements.xlsx — 所有标记个体的总长度（cm）与体重（g）数据