rough fish

noun
any fish that is not valued as a sport fish or considered a significant source of food by sport fishers.

Origin:
1835–45

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World English Dictionary
rough fish
 
n
a fish that is neither a sport fish nor useful as food or bait for sport fish

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Rough fish are species not having statewide size or creel limits, such as gar
  or carp.
Rough fish removal operations are conducted periodically.
Carp and other rough fish may reduce water clarity and prohibit the growth of
  these desirable plants.
No stocking is recommended because of the warm water and the large population
  of rough fish.
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