In presented paper we demonstrate successful repatriation of Cyclops abyssorum (Crustacea, Copepoda) into its original habitat – Lake Plešné in Šumava Mts. of glacial origin. After inoculation in 2004 we detected two-year period of exponential population growth, after which the population reached a plateau.
We also show impact of this predator species on the whole planktonic community.