European grayling (Thymallus thymallus L.) is important and ancestral kind of fish in Czech Republic. Today number of grayling in open waters is decreasing. It caused many reasons. Mainly increasing fishing pressure, unfavourable regulation of streams, water pollutinon, raising occurrence of predators etc. That is why is necessarily devote care to this problem. Main goals of this work were optimalization of technologies to decrease post-spawning mortality of grayling spawners. Optimalization of technologies for breedig offspring of European grayling (Thymallus thymallus L.). Use artificially propagated stock of European grayling (Thymallus thymallus L.) in conditions of open waters. Experiments were done in Blanice River in South Bohemia (Czech Republic) and a hatchery of the Czech Anglers´ Union in Husinec. Part works were done in 2005, but majority in 2006. Results of this work indicate that is possible decrease post-spawning mortality of grayling spawners with using antibiotics. Also using stockfish from controlled conditions for restocking the open waters is conditionally possible. Problem is however with high losses after release.
| Identifer | oai:union.ndltd.org:nusl.cz/oai:invenio.nusl.cz:46799 |
| Date | January 2007 |
| Creators | NEBESKÝ, Václav |
| Source Sets | Czech ETDs |
| Language | Czech |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis |
| Rights | info:eu-repo/semantics/restrictedAccess |
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