Trout zone is a spring area of a river with low temperature, narrow riverbed, rapid flow rich in oxygen and a rocky bottom. Submerged plants which tolerate such conditions are primarily moss and diatoms. Here you can see its most famous species, the brown trout. Brown trout is a very interesting species which feeds on invertebrates and small fish – for example bullhead which also lives in our aquarium. Trout is particularly attractive to sports fishermen. In 1968 the largest brown trout in the world at that time was caught in Croatia, weighing 24.5 kilograms and of 124 centimetres in length.