The lookdown is a silvery, flat-bodied fish that visits the lower to middle Chesapeake Bay in summer and autumn.
The lookdown's thin, flattened, silvery body can grow to a foot or longer, but rarely exceeds 2 to 3 pounds. It has a flattened head and a large mouth located low on its face. Long, thin first rays appear on the back and anal fins, and its tail is deeply forked with a small tail base. Juveniles have long, feathery fins on their back and belly.
Most often found in sandy areas near bridges and pilings. Usually live in small schools close to the bottom.
Visit the lower to middle Chesapeake Bay in summer and autumn, occasionally ranging as far north as Calvert and Talbot counties in Maryland.
The lookdown eats small worms, fish and crustaceans.
Spawning occurs with females laying eggs into the water column. Little else is known about its reproductive cycle.