Herring eating krill, euphausiid shrimp. Video taken from my boat tied to dock in Q Cove, Quadra Island. Big herring show Mar 3 2015.
We think of herring as a forage fish that predators eat, but like most things in the sea, they are in the middle of the food web, and here they are the aggressive predator on the euphausiids. Those eupahausiids look like little minnows swimming but if you can catch one it will curl up in you hand and appear as a shrimp.