(A) Three sections of the Városliget pond system in Budapest, Hungary; U: upper section, M: middle section, L: lower section, Sz: Széchényi thermal bath. (B) Detail of the upper section with sampling points indicated by numbers. The restaurant under which all Cherax individuals other than the redclaw were caught is located between sampling points 4 and 5. Maps taken from Google Earth. (C) The upper section of the thermal pond in early March 2020. (D) The iron grid on the outflow of the pond in January 2020. The stain on the grid and concrete wall indicates the water level in the middle section from the end of March until the end of October.