There is a fascinating fact related to the Tisa river, and it refers to its blooming. This happens every year in mid-June. That phenomenon is inexplicable and incomprehensible. Regardless of atmospheric conditions, a chrysalis emerges from the riverbed from which an insect called the Tisa Flower develops. There are so many of them that it is impossible to imagine. Even National Geographic filmed a show about that event. The phenomenon lasts three or four days. Scientists call this state metamorphosis, which is the transition from one form of life to another. When it emerges from the chrysalis, the insect has no mouth or stomach because it has no digestive tract. Therefore, it cannot feed and lives only three days. Its only task in that phase of existence is to perform its love dance, after which it dies. Already after a few days, entire streams of dead insects can be seen floating down the Tisa towards the Danube. In the evening hours, there are so many butterflies that one bank cannot be seen from the other. At that time, while the fish feed on insects falling on the water, there is no fishing. Fishing resumes only when the fish get hungry.