I've caught herring in the winter in the salt and I know the ones used at round valley are a different type. If I'm not mistaken, Blueback Herring are the ones we get in the winter.
Never having seen one from the Delaware, I was thinking maybe they're juveniles of the same type that runs up the Delaware...I think they are called Alewive herring...Not to be confused with what they call Alewives in MD...we call them Bunker.
There's a lot of different types of herring...gets confusing
Thanks for the info.