A free checklist of procedures for winter boat lay-up is available from the University of Delaware Sea Grant Marine Advisory Service. This is SeaTalk, a public service announcement from the University of Delaware Sea Grant College Program and this station. Ocean News from the University of Delaware. Summer and winter flounder are easy to tell apart. The summer flounder has eyes on the left side of its body, while the winter flounder has eyes on the right.
All flat fishes begin life swimming upright and with eyes on both sides of the body.
However, they undergo a change when an eye migrates from one side of the body to the other. At the same time, the body flattens out, allowing the fish to lie on the bottom of the water. In summer flounder, an eye migrates to the left, and in the winter flounder it migrates to the right. With a fish held tail towards you and jaw down it is easy to tell the difference by looking at the eyes in relation to the belly. This is SeaTalk, a public service announcement from the University of Delaware Sea Grant College Program and this station.