When to fish for Winter Flounder: A gentle moving tide is ideal — enough current to carry the chum slick away from the boat in a defined lane, not so much that the mud plume is torn apart.
Also known as Blackback, Blackback Flounder, Lemon Sole (large), Mud Dab. Bait, technique, tide windows, and where the bite is on right now.
Winter Flounder — Right-eyed spring flatfish — a chum-and-wait bay fishery. Also called Blackback, Blackback Flounder, Lemon Sole (large), Mud Dab.
Winter flounder are right-eyed and summer flounder (fluke) are left-eyed. Lay the fish dark-side-up with its head pointing away from you: if the eyes are on the right, it is a winter flounder, and a different set of rules applies. That is a bag-limit question, not trivia. The species also carries antifreeze glycoproteins in its blood, which let it stay active in water at −1.5 °C — the reason it is feeding in shallow bays in February when every other flatfish has moved off to deep water.
Winter Flounder is also known as: Blackback, Blackback Flounder, Lemon Sole (large), Mud Dab. Right-eyed spring flatfish — a chum-and-wait bay fishery.
Regional names can confuse anglers and cause misidentification. The table of common names below covers the most-used alternatives across Australia, New Zealand and the US:
Key to correct identification: check the regulations-authority species sheet for your state or territory before keeping any fish — minimum legal sizes, bag limits and identification guides are published by each fisheries department and are the authoritative source.
How widely Winter Flounder is in season across the 2 regions we cover it in. A full month means every one of those regions has it in season; a faint month means only some do. This is the expected season, not a catch record.
Hero spots in our coverage where Winter Flounder is in season for October. Click through for the live forecast.
Out of season across our covered spots in October.
This is an anchoring, chumming and waiting fishery, and every part of it matters. Anchor over soft mud or mud-and-sand bottom in a bay or harbour in 6–25 ft, ideally where a slight channel edge breaks the flow. Put a chum pot on the bottom filled with crushed mussel, clam and corn, and then work the sinker deliberately against the bottom every few minutes to raise a mud cloud — winter flounder come to disturbance, and the mud plume is doing as much as the chum. Fish a spreader rig with small long-shank hooks in the size 8 to 12 range, because the mouth is tiny and set well forward for grazing the bottom. The bite is a delicate tap-tap-tap with no weight behind it; wait through the taps until the rod loads, then lift steadily rather than striking. Most anglers who blank on flounder are striking on the first tap.
A gentle moving tide is ideal — enough current to carry the chum slick away from the boat in a defined lane, not so much that the mud plume is torn apart. That makes the hour either side of slack the sweet spot for flounder, which is the opposite of most bay species. Big spring-tide currents are actively unhelpful here. The last of the run-in over a shallowing mud flat on a sunny afternoon is a classic spring session.
Moon phase barely registers. Water temperature and the calendar drive this fishery entirely: the fish move into shallow bays and harbours to spawn in late winter, feed hard through spring as the water climbs through 40–50 °F, and move out to cooler deeper water by early summer. Neap tides, with their gentler currents, suit the chum-slick presentation better than springs.
Figures come from each jurisdiction's own fisheries authority, with the source linked on every page above. Rules change — closures in particular are reset annually — so confirm with the authority before you keep a fish.
Winter flounder stocks in southern New England and the Mid-Atlantic are heavily depleted, and the rules reflect it — small bags, a minimum length, and a genuine closed season in several states over the winter months. Read the per-jurisdiction figures above and check the season dates as well as the numbers, since the closure is what catches people out. New Jersey additionally prohibits filleting winter flounder at sea except aboard permitted party boats, so plan to land them whole.
US state size & bag limits for Winter Flounder: NJ
Olli-Mikael Vaittinen has fished his whole life. Fifteen years of fly fishing, guiding seasons on Norway's Lakselva — his favourite Atlantic salmon river — and a blue marlin landed in Vava'u, Tonga. Founder of Fishare — the app that puts the data behind the decisions every angler makes on the water.
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