http://en.wikipedia.org/wiki/Menhaden
The Atlantic menhaden (Brevoortia tyrannus) is a small, oily-fleshed fish
The maximum size for the Atlantic menhaden is usually 15 inches (380 mm).
They are bright silver, and have black spots extending horizontally from the gill plate to the tail, with the largest directly behind the gill plate. They are quite flat and soft fleshed, with a deeply forked tail. The edges of the fins and tail often have a yellowish hue. At sea, schools may contain millions of members.