minnow

noun

1. very small European freshwater fish common in gravelly streams

   noun.animal

   Synonyms phoxinus phoxinus

   Source: WordNet 3.0

2. A small European fresh-water cyprinoid fish (<i>Phoxinus l&aelig;vis</i>, formerly <i>Leuciscus phoxinus</i>); sometimes applied also to the young of larger kinds; -- called also <i>minim</i> and <i>minny</i>. The name is also applied to several allied American species, of the genera <i>Phoxinus</i>, <i>Notropis</i>, or <i>Minnilus</i>, and <i>Rhinichthys</i>.

   noun

   Source: webster1913