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As part of the conference, expert studies on the state of the lake and the possibilities of restoring the original ecological balance were presented.
István Máthé, biologist, associate professor at the Hungarian University of Transylvania (EMTE) of Sapientia, said:
The lake’s water began to change from 2017 from the old blue-gray color to green.
The phenomenon is due to the growth of algae and the monopoly of the green algae Cosmocladium. While the lake’s six-meter-deep water was transparent to the bottom in spring 2012, the water’s transparency dropped below two meters this spring.
On the one hand, the changes were caused by tourists bathing in the lake, but the effect was even more pronounced with the appearance of an invasive fish species called silver carp in the lake around 2010, which feeds on zooplankton ( small crabs). they feed. István Máthé said: the quality of the water could be improved by drastically reducing the number of fish.
Fish biologist István Imecs said that silver carp can be considered a “garbage fish” from a fishing point of view, expanding extremely aggressively and crowding out the most valuable fish species. He added that only this species of fish is found in Lake St. Anne.
According to the biologist, a radar study of the fish population should be done at the beginning and end of the intervention, but fish should also be taken using a grid method to determine how many age groups live in the pond by examining the scales of individuals.
István Imecs described various fishing methods. He noted: of these, the one that is most effective should be used. However, he added that silver carp cannot be completely eradicated from the lake, the most effective method must be maintained forever.
István Imecs said that the possibility of regulating the crucian population by introducing predatory fish was also discussed, but the idea was rejected for the time being.
Neither pike nor catfish are a better solution than fishing. If we were to introduce these predatory fish, their populations would also have to be controlled.
he said.
Biologist István Máthé added: it will take years for the small algae-eating crustaceans to multiply again and for water quality to improve. He believed that it could take five to ten years for the waters of Lake St. Anne to turn blue again.
Public awareness that Lake St. Anne is the Szekler shoreline must disappear. We drink its juice now
said Leventedósa Elek, president of the Pro Szent Anna Association. According to him, they should also intervene in the forests surrounding the lake to wash as little sediment as possible into the lake.
Leventedósa Elek added: they have already bought the fish traps (foals) and an electric boat with which they can start fishing. However, they must also obtain approval from the environmental authority for the operation.
Lake St. Anne was formed in the crater of a volcano. The lake actually stores the rainwater that falls into the volcanic crater, it has no source or runoff, so its water has little capacity to self-purify. Bathing in the lake was banned in spring 2018.
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