adipose fin

noun
a small, fleshy fin, usually lacking rays, behind the main dorsal fin in trouts, catfishes, and other bony fishes.
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World English Dictionary
adipose fin
 
n
a posterior dorsal fin occurring in some fish, such as those of the salmon and catfish families

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Adipose fin-clipped steelhead containing a disk tag may also be harvested.
Hatchery steelhead are identified by a missing adipose fin with a healed scar
  in its location.
The bacterium first attacks the adipose fin, which will display a noticeable
  white line along the outer margin.
Anglers are strongly encouraged to retain the first two adipose fin-clipped
  hatchery-origin steelhead caught.
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