Maine Seafood Guide – Flounder
American plaice (or dab) Hippoglossoides platessoides
Winter flounder (blackback flounder or lemon sole) Pseudopleuronectes americanus
Windowpane (sand) flounder Scophthalmus aquosus
Witch flounder (grey sole) Glyptocephalus cynoglossus
Yellowtail flounder Limanda ferruginea
Flounders are flat fishes: they lie not on their bellies, but on one side. Their skulls twist as they grow, so that the eye that was originally on the underside migrates around the head, until both eyes come to lie close together on the side facing up, either left or right.
American plaice or dab is a large-mouthed, right-eyed flounder common in deep, sandy or muddy-bottomed waters in the Gulf of Maine and along the Northwest Atlantic continental shelf from southern Labrador to Rhode Island.
Winter flounder is a thick, right-eyed flatfish with dark mottled skin, inhabiting the shallow, muddy bottoms of brackish rivers and estuaries from Labrador to Georgia.
Windowpane flounder is a thin, pale, left-eyed flatfish that lives on the bottom of sandy and muddy bays and estuaries from the Gulf of St. Lawrence to Florida, with concentrations on Georges Bank and the mid-Atlantic. In the Gulf of Maine, most are found in Massachusetts Bay.
Witch flounder is a thin, smooth, right-eyed flatfish found from Labrador to Virginia in deep, muddy-bottomed waters. Generally brown or russet gray.
Yellowtail flounder is a thin, right-eyed flatfish ranging deep, sandy-bottom habitat from Gulf of St. Lawrence to Chesapeake Bay.
Plaice: Year-round, with peak in spring and summer.
Winter flounder: Spring through fall.
Windowpane flounder: Generally not targeted by fishermen or available to consumers.
Witch flounder: Year-round.
Yellowtail: Late fall through spring.
American plaice stock is not overfished nor is overfishing occuring.
Winter flounder A 2015 stock assessment could not estimate abundance, but did determine that overfishing is not occuring.
Windowpane flounder is overfished and but overfishing is no longer occuring.
Witch flounder is overfished and overfishing is occuring.
Yellowtail flounder is overfished and overfishing is occurring.
Flounder and plaice are part of the Northeast Multispecies (groundfish) fishery managed by the New England Fishery Management Council. Winter flounder is co-managed with the Atlantic States Marine Fisheries Commission.
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Maine anglers can fish for flounder year-round. The minimum size limit for winter flounder is 12 inches and the daily limit is eight fish per angler. Other size limits: witch flounder = 14 in.; yellowtail = 13 in.; plaice = 14 in.; summer flounder = 20 in.
Flounder is a low-fat, low-calorie source of vitamin B12, vitamin D, selenium, and omega-3 fatty acids. Flounder is low in mercury. Windowpane flounder is sensitive to pollution, and in general the presence of healthy flatfishes indicates clean water and sediment.
Flounder is a delicate, flaky white fish, best for frying, broiling, baking, and poaching. Ask the fishmonger for flounder species if it is not indicated.