Medical leech (Hirudo medicinalis). Producer of bilogicals from series: BIOGEN – probiotic for all animals BIOSAN – for improvement of physical and chemical parameters of solid and gas impurities in sewages and livestock buildings. Producer of preparations: ATONIK – growth and yield stimulator for cultivated plants KRIO-FLOR – anti-ground-frost screening for plants biopreparation for bioutilization of bottoms (sludge) from lakes and ponds.