ABSTRACT
This paper describes an introduction of aquarium ornamental fish, Xiphophorus interspecies hybrid (Poeciliidae) in an artificial water reservoir in Pole Mokotowskie park complex in Warsaw, Poland. Caught individuals have been identified, described and presented in photographs. Measurements of selected physicochemical parameters of water were made and perspectives for the studied population were evaluated. The finding is discussed with available literature describing introductions of alien species with aquaristical origin in Polish waters.
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