Chub (Squalius cephalus) shoal at spawning ground with Mallard duck (Anas platyrhynchos) viewed from above, Sava Bohinjka River, Slovenia. June.
Chub (Squalius cephalus) shoal at spawning ground with Mallard duck (Anas platyrhynchos) viewed from above, Sava Bohinjka River, Slovenia. June. Photographed for The Freshwater Project