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Fish population on the river Dyje at NP Podyjí
 Štrunc, David ; Kalous, Lukáš (advisor) ; Kuříková, Pavlína (referee)
This thesis is focused on changes of fish populations in the river Dyje located at the national park Podyjí. These changes are caused mostly due to presence of two large dams (Znojemská and Vranovská dam) between which w the study locality is situated. There are also other factors affecting ichtyofauna composition as piscivorous predators, non-native species or restocking of particular target species. First information about the fish populations appeared in year 1921. In that years, the locality contained species, that are not present at the river site at the moment. Examples given: sturgeon (Acipenser ruthenus) and danube salmon (Hucho hucho). These species extincions were associated with interupted fish migration between locality and Donau river basin. On the other hand, new fish pecies (that are not-native to Czech Republic and were not observed before 1921) started to appear during following years. From the former fish population of type Barbus-Chondrostoma the type changed to Salmo-Thymallus. Most of this change was caused by regular restocking of the salmonids. Since 1993 there is evidence on new presence of tolerant fish species that do not necesarilly need cold, flowing water. There is high probability, that this appearance is caused by slowing down the river stream and also the heating of the water, that takes place in the dam.
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