These fish have a very long thread-like fin. Threadfin herring are good bait for many different species, but they work best as cut bait for bottom fishing.
How to Catch Threadfin Herring
Using Threadfin Herring as Bait
Fish them alive on a variety of rigs. They will work on a weightless rig when the fish are shallow up higher in the water column. They also look great on your favorite bottom rigs. Many anglers use Threadfin herring as cut bait on their favorite bottom rig.