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- Title
Wind of change: selective summer fish kill in an oxbow lake associated with windy weather.
- Authors
Daněk, Tomáš; Bouše, Eduard; Musil, Jiří
- Abstract
High-frequency data from dissolved oxygen (DO) loggers were obtained during and before a massive summer fish kill event in the oxbow lake Doubka in the Elbe river basin, Czech Republic, and evaluated in the context of meteorological data. In the period from 3 June to 1 September 2020, extreme fluctuations of DO in the surface layer of water were recorded (values in the range of 0–25.48 mg l−1). The DO concentrations were affected by phytoplankton photosynthesis and fluctuated within 12 h from more than 100% saturation (in the afternoon) to zero (at dawn). DO values near the bottom were less variable (0–9.67 mg l−1) and after mid-July, zero values prevailed. A huge fish kill associated with windy weather occurred between 26 and 28 August 2020, resulting in more than 800 kg of dead fish. High percentages of dead fish were of the northern pike (Esox lucius), the pikeperch (Sander lucioperca) and the European catfish (Silurus glanis). Wind-induced water mixing (when oxygenated water containing phytoplankton moved from the surface to the anoxic bottom) and subsequent depletion of oxygen by decomposition processes in the organic substrate of the bottom, in combination with limited sunshine in the same period, resulted in a 2-day lack of oxygen both in the surface layer of water and near the bottom. Repeated fish kills probably contribute to the massive occurrence of the resistant and invasive topmouth gudgeon (Pseudorasbora parva) at the locality.
- Subjects
CZECH Republic; FISH kills; WEATHER; WATERSHEDS; LAKES; WALLEYE (Fish)
- Publication
Environmental Biology of Fishes, 2023, Vol 106, Issue 8, p1815
- ISSN
0378-1909
- Publication type
Article
- DOI
10.1007/s10641-023-01451-9