Fig. 1From: Caviar, soup and other dishes made of Eurasian ruffe, Gymnocephalus cernua (Linnaeus, 1758): forgotten foodstuff in central, north and west Europe and its possible revivalRuffe in the Pärnu River, Estonia. The stony river bed would a source of mollusca, crustaceans and larvae on which ruffe also feed (Wikimedia Commons CC BY-SA 3.0)Back to article page