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National Repository of Grey Literature 2 records found  Search took 0.02 seconds. 
Monitoring of the bullhead (\kur{Cottus gobio}) in the upper reaches of the river Elbe.
 GUČÍK, Michal
Bullhead is common fish of our trout zones of streams and small rivers. It lives in mountain streams or small rivers. It needs clear water with high oxygen saturation. Therefor bullhead is used as a bioindicatorof clear waters. The aim of our experiment was compare the influence of artificial and natural flood on bullhead population in river Labe. Artificial flood was caused by wild water race competition in 2011. There was drained the water reservoir Labská during this event. The observed stretch of river Labe was fished out before and after this competition using electric generator. The fish obtained before the artificial flood were branded and released back to the river. New out fishing was done immediately after the flood. There were counted and measured the fish with or without brands. The same manner was used for obtaining of dates before and after natural flood in 2012. The main result of this experiment is showing the artificial flood is more destructive and dangerous than natural flood. The reason is faster increase and decrease of flow in river during the artificial flood.
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Electronic fish barrier "ELZA 2" protecting fishing objects from eurasian otter input
 GUČÍK, Michal
The euroasian otter is omnipresent species in most territory of the Czech republic. This protected species applied claims in the fish farming objects. Effective protection and prevention from infiltration of the euroasian otter to the fish farming objects actually doesn´t exist. The aim of this study is check of efficiency of the fish electric barrier ELZA 2 as economical protection from infiltration of the euroasian otter to the fish farming objects.
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