Definition from Wiktionary, the free dictionary
pickerel (plural pickerel or pickerels)
- A freshwater fish of the genus Esox.
- (Canada) Walleye, A species of gamefish, Sander vitreus, native to the Northern U.S. and Canada with pale, reflective eyes.
- The plural ending in "s" refers especially to multiple varieties (e.g when speaking of multiple species), whereas the other is preferred when speaking of multiple fish of the same kind.