noun A fleshy fin located on the back of some fish, between the dorsal fin and the tail fin.
The presence or absence of an adipose fin is used as a key characteristic in identifying different species of fish.
The adipose fin is a small, fleshy fin found on the backs of most species of salmonid fish.
Adipose fin clipping is a common practice in fisheries management to mark hatchery-raised fish for research and conservation purposes.
The biologist studied the presence of an adipose fin in various fish species to determine their evolutionary relationships.
The fisheries scientist used the presence or absence of an adipose fin as a characteristic to identify different fish species.
The marine biologist observed the size and shape of the adipose fin in sharks as a way to distinguish between different species.
The zoologist compared the adipose fin of different mammal species to understand their adaptations to their aquatic environment.