noun, plural (especially collectively) weakfish (especially referring to two or more kinds or species) weakfishes.
any food fish of the genus Cynoscion, as C. regalis, inhabiting waters along the Atlantic and Gulf coasts of the U.S.

1790–1800, Americanism; < Dutch weekvis (obsolete), equivalent to week soft, weak + vis fish

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World English Dictionary
weakfish (ˈwiːkˌfɪʃ)
n , pl -fish, -fishes
any of several sciaenid sea trouts, esp Cynoscion regalis, a food and game fish of American Atlantic coastal waters

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1838, from Du. weekvisch, from week "soft" (see weak).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Lower estuary anglers can also catch marine species such as bluefish, weakfish,
  and flounder.
Spotted sea trout have a pair of enlarged canine teeth in their upper jaw and
  the lower jaw is projecting, as in a weakfish.
Weakfish collected in mid-bay were intermediate in their stable isotope
Slow trolling and bottom bouncing has also caught a few weakfish.
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