Crossword clue: a small freshwater european perch (acerina vulgaris); -- called also pope, blacktail, and stone, or striped, perch.

The most common answer is ruff (4 letters).

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

Possible answers

ruff 4 letters web-def

(card games) the act of taking a trick with a trump when unable to follow suit

ruffe 5 letters web-def

A small freshwater European perch (Acerina vulgaris); -- called also pope, blacktail, and stone, or striped, perch.