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Fish communities in streams PLA Jizera Mountains
 JANOŠÍK, David
Flows in the PLA in the Jizera Mountains are unique for the occurrence of indigenous populations of brown trout (Salmo truta morpha fario) and several protected and endangered species of fish and cyclostomes. V 2 Mid-20th The situation for the acidification of the aquatic environment. As a result, stocks have almost disappeared fathead minnow (phoxinus phoxinus) and other indigenous fish. Another reason was the disruption ichtyocenosis fragmentation high flows associated with the construction of barriers to cross small hydro (MVE) and various degrees. Giant Mountains in the PLA was the main objective of checking the functionality of fish ladders, monitoring of fish migration and permeability. Furthermore Ichthyological surveys were conducted pre-selected sections of streams to determine the composition of the ichthyofauna. Was monitored and the success of reintroduction of certain species of fish, particularly fathead minnow in its original location. Were collected and physical and chemical properties of water.
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