A mesocosm experiment investigating the effects of substratum quality and wave exposure on the survival of fish eggs |
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Authors: | Stefan Stoll Wolfgang Nikolaus Probst Reiner Eckmann Philipp Fischer |
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Institution: | 1. Limnological Institute, University of Konstanz, 78457, Constance, Germany 2. Department of Limnology and Conservation, Research Institute Senckenberg, 63571, Gelnhausen, Germany 3. Johann Heinrich von Thünen-Institute of Baltic Sea Fisheries, Alter Hafen Süd 2, 18069, Rostock, Germany 4. Alfred-Wegener-Institute for Polar and Marine Research, Biologische Anstalt Helgoland, Kurpromenade 201, 27498, Helgoland, Germany
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Abstract: | In a mesocosm experiment, the attachment of bream (Abramis brama) eggs to spawning substrata with and without periphytic biofilm coverage and their subsequent survival with and without low-intensity
wave exposure were investigated. Egg attachment was reduced by 73% on spawning substrata with a natural periphytic biofilm,
compared to clean substrata. Overall, this initial difference in egg numbers persisted until hatching. The difference in egg
numbers was even increased in the wave treatment, while it was reduced in the no-wave control treatment. Exposure to a low-intensity
wave regime affected egg development between the two biofilm treatments differently. Waves enhanced egg survival on substrata
without a biofilm but reduced the survival of eggs on substrata with biofilm coverage. In the treatment combining biofilm-covered
substrata and waves, no attached eggs survived until hatching. In all treatments, more than 75% of the eggs became detached
from the spawning substrata during the egg incubation period, and <1% of these detached eggs survived within the substratum
interstices. Hence, detached eggs contributed little to the reproductive success we observed. The implications of these results
on the spawning success of fish species that use freshly inundated spawning substrata in shallow waters are discussed. |
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