Vimba is a roach fish. It looks a bit like whitefish, but vimba does not have an adipose fin. Vimba has a thick, snout-like upper jaw, and its mouth is beneath the snout. The bases of vimba’s pectoral and ventral fins are reddish yellow, and the tips are grey. Vimba swims in schools along Finland’s coasts, with the exception of the northern most part of the Gulf of Bothnia. Vimba is a migratory fish by nature, spawning in the gravel bottoms of streams. However, the damming and pollution of rivers has greatly affected it. Usually roach fish endure the stress caused by pollution well. However, some frail vimbas have been seen to die after spawning.