noun

• A small, rayless, fleshy dorsal fin present in certain fishes, notably in the salmon family.

  ‘Like all salmonids the grayling has a small adipose fin behind the dorsal fin.’

  More example sentences

  • ‘Another physical characteristic of the brook trout is an adipose fin and a caudal fin that is slightly forked.’
  • ‘There is no dorsal adipose fin present on Rhadinesthes decimus.’
  • ‘It has a small terminal mouth, and an adipose fin may or may not be present.’
  • ‘All stocked fish had the adipose fin clipped so that they could easily be recognised.’