adipose fin
animal appendage
Quick Summary
The adipose fin is a soft, fleshy, rayless fin found in certain fish, such as salmon and catfish. It is located on the back between the rayed dorsal fin and the tail fin. This fin is a modification of the posterior dorsal fin and lacks bony supports. It is present in most ostariophysan fishes, a group that includes many common freshwater fish. An appendage, in a biological context, refers to a part of an animal's body that is attached, such as an insect's antennae or wings.123
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