At the end of the 1940s, two dams were built on the Jagi thinking of breeding trout in clean water ponds. Pilisszentiván is south-west at this time, they began to undertake large-scale mining development. THE due to the underground cut system, the water resources of the Jagi source have dropped and are drier the waters dwindled many times. The trout farm has remained a dream. With water supply ever since. The upper, smaller lake was completely dried up, and it grew in the lower lake Organic material derived from algae, reeds and other aquatic plants. This process is called eutrophication. But even today, the lake gives shelter to many living creatures. Among them the frogs are most prominent. Of the 12 domestic species here are brown toad, goat's frog, red-headed unka, the forest frog and the green bean tree seen on the picture. reproduction, the steps of their development can be observed from early spring to autumn. Honeymoon easily it can be observed as male frogs cling to the back of women. Interestingly, a emitted eggs are freed by male spermatozoa, fertilized in water. It is fertilized eggs in the water are multimeter garlands or ball-shaped knots characteristic of the species form. During the development of the ewes hatching from the ewes, the rear, then the front legs appear. Then the tail develops back and goblins together its lungs are taken over by the lungs. The converting baby is often due to the high water loss smaller than the ebihal. In the lake, of course, there are not only frogs. The bar next to the educational trail is water sampling and it also facilitates studying the lake life. Our second and In the third chapter we describe the other species living in the lake.
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