Fish that are not behaving normally are swimming in the nation's rivers. They are not searching for food or a breeding partner. They are addicted to drugs, which are flowing along with flushed water through the sewers and into Slovak rivers with the intensity with which people do drugs today.
Crayfish, on the other hand, are attacking and hunting prey more because they are on antidepressants. Pills whose purpose is to treat grief are eliminating their shyness.
Along with women's urine, contraceptive substances are entering the rivers, which can endanger entire fish populations.