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.