Discovery of a population of fresh-water hydroid jellyfish Craspedacusta sowerbii in the river Inga of Tver region

The local population of fresh-water hydroid jellyfish Craspedacusta sowerbii Lankester (1880) has been discovered at the end of summer of 2002 in the tributary of Volga river in the region of Tver. Six individuals of the mentioned jellyfish have been impregnated and placed in aquarium for further monitoring. The inspection of the discovery place has also been carried out.