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Semi-intensive rearing of young breeding European grayling (Thymallus thymallus L.) using self-seeded insect.
 SADLOŇ, Patrik
The aim of the experiment was to test the semi-intensive rearing of grayling (Thymallus thymallus) using technical equipment to lure flying insects. The experimental fish came from two sources and were reared in these localities: The Trout Farm ČRS Kaplice and The Experimental Fish Culture and Experimental Facility (ERPP) of the Faculty of Fisheries and Protection of Waters SBU in Vodňany. The rearing was carried out between the beginning of May and the end of October or half November 2014. Three concrete troughs were used in Kaplice. One for the control group and the other ones with technical elements installed to lure insects: one with a light source pointed to a plastic board placed under the water surface and the second with electric insect traps. In Vodňany, the fish were reared in two nurseries. One was used for the control group and the second was fitted with the combination of underwater light and insect traps. All groups were fed with commercially manufactured pellet feed. The fish were regularly measured (total length, body length, weight) and examined by a veterinarian. During the experiment, better growth in the trough with the lighted board was noticed in the first period of rearing in Kaplice. It was visually confirmed that the fish took the insects in the vicinity of the technical elements in both localities. The course of the experiment was later strongly influenced by the deteriorating health condition of the fish with the subsequent bad intake of feed in both localities especially between June and the end of September. In Kaplice, the inflow water quality became unstable and some predatory fish invaded the rearing trough. This led to high losses of the reared fish in both localities. In spite of some positive findings, the effect of the applied elements on grayling rearing in the selected objects has not been successfully proved.
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