South Bohemian ponds. Vltava river at Prague. 26th April 1993 male. Ponds in the Odra river valley. Tovacov ponds and gravel pits.
All ponds are usually without water during winter.
Among gravel pits, the deepest one froze regularly in late December or early January. Regular migrating species are e. g. 27th April 1991 female, 7th April 1998 male. Other included 9. 9th September 1962 immature, 4th of 4 Czech records.