adipose fin

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Related to adipose fins: ventral fin

adipose fin

n.
A fleshy rayless fin located on the back of a fish between the dorsal fin and the caudal fin, found in certain fishes such as salmon, trout, and catfishes.
References in periodicals archive ?
Median dorsal line of trunk with 15-16 scales between supraoccipital and dorsal-fin origin, 11-13 between dorsal fin and adipose fin and 8-9 between adipose fin and upper caudal-fin insertion.
Color pattern of preserved specimens: A lateral and discontinuous narrow dark brown stripe running inconspicuously on lateral line from a vertical through middle dorsal fin to base of caudal peduncle; two or three large dark brown vertically elongated blotches along middle trunk: first vertically aligned with dorsal fin, second anterior to adipose fin and third on caudal peduncle.
The adipose fin is that small, fleshy fin located between a salmon's tail and its dorsal fin.
See page 67 of the 2003 Oregon Sport Fishing Regulations for additional details on how to tell one from the other - or if you're not sure what the adipose fin looks like.
But anglers all along the coast were smiling on opening weekend of the "selective coho season" - so-called because anglers must be selective in their harvest, keeping only hatchery-reared coho with a clipped adipose fin.
Coho must be at least 16 inches in length and have a healed adipose fin clip.
Only hatchery-reared coho with a healed adipose fin clip may be retained.
To avoid getting ticketed, Day says anglers at the dam are releasing about half of the salmon they reel in because the fish have adipose fins that either were not clipped properly at the hatchery before they were released or have partially "regenerated.
The water's too high" (on the Willamette River below Dexter Dam); "the water's too low" (on sections of the McKenzie River bypassed by Eugene Water & Electric Board "power canals"); the poachers are snagging salmon; and "too many fish have to be released because their adipose fin wasn't clipped properly.
Only fish with hatchery-clipped adipose fins may be retained on the McKenzie.
About the only thing our group found to complain about was the number of fish that had to be released due to what appeared to be either partially clipped or regenerated adipose fins.