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common minnow

n. A widespread species of minnow, (taxlink Phoxinus phoxinus species noshow=1).

Wikipedia
Common minnow

The Eurasian minnow, minnow, or common minnow (Phoxinus phoxinus) is a small species of freshwater fish in the carp family Cyprinidae. It is the type species of genus Phoxinus. It is ubiquitous throughout much of Eurasia, from Britain and Spain to eastern Siberia, predominantly in cool (12–20 °C) streams and well- oxygenated lakes and ponds. It is noted for being a gregarious species, shoaling in large numbers.