Definition of jackfish in English:
 jackfish
nounPlural jackfishesˈdʒakfɪʃˈdʒækˌfɪʃ
North American A pike or sauger, especially the northern pike.
 Example sentencesExamples
-  You might target the king mackerel, the Gulf's most popular light-tackle species, but the next hit could be from a ling, a jackfish, a bonito, a dorado, a shark, a tuna, a wahoo - or something beyond a kid's wildest dreams.
 -  You can also clap eyes on large groups of bass and twirly pikes (luces or jackfishes).
 -  The star turn is inevitably a shoal of " big-eye jackfishes ", of more than 100 individuals.
 -  I especially enjoyed feeding my catches from the morning to the 3-4 foot long jackfishes cruising around the pier.
 -  We hovered for a while watching the sweepers being herded one way and then another by black grouper, squirrelfish and the occasional swooping jackfish.