The tiny adipose fin, a fatty nub between the dorsal fin and tail of some 6,000 species of fish, has been the ugly stepchild of anatomy. Most scientists shrugged and dismissed it as a withered ...

MacIver has been a fan of black ghost knives for years, and marveled at how the fish could move forward or backward, or up or down simply by using the one fin. Along with graduate student Oscar ...

These fish have evolved highly specialized jaws for fin-eating. When they’re young, some of them eat smaller fish whole, but by the time they become adults, they really only care about chomping ...

Fin proprioception may also contribute to interactions within and between fish species. This proprioceptive sense could be a factor during interactions with potential mates and in caring for ...

The small, ear-shaped adipose fin is located on top of the fish, to the left of the larger dorsal fin. On a clipped-fin fish, this fin would be missing. (credit: Michigan Department of Natural ...