Typical habitats of spirlin within riverine ecosystems: left – Kosanica River (a right tributary of the Toplica River), right – Beli Timok (a headwater of the Timok River), Serbia (photos by M. Jakovljević), middle left – Skrwa Prawa River (a right tributary of the Vistula River) near the village of Parzeń, middle right – Skrwa Prawa River near the village of Lasotki, Poland (photos by L. Marszał). Lower left and right: Warta River near the village of Załęcze Wielkie, Poland (photos by G. Zięba).