The winter flounder is a right eyed flatfish. That means that if you set the critter on edge, dorsal edge up, and view it from above and aft, both eyes are on the right side of the head. This information is not particularly useful in the real world where the flounder lies on one side and the dorsal and ventral edges don't look all that different. Identification is further complicated by the fact that it disappears completely whenever it stops moving.
Flounder feeds and vanishes