noun, plural (especially collectively) jackfish (especially referring to two or more kinds or species) jackfishes.
any of several pikes, especially the northern pike.
the sauger.

1735–45; jack1 + fish

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World English Dictionary
jackfish (ˈdʒækˌfɪʃ)
n , pl -fish, -fishes
the pike fish, esp when small

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Tuna, mackerel, and jackfish are exempt from this tax.
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