Flounder

About

Southern flounder are an ambush predator, and Charleston's inshore system — with its mix of sandy channel edges, inlet mouths, dock shadows, and hard-bottom ledges — is purpose-built for them. They lie flat on the bottom, camouflaged against the sand or shell, and explode on baitfish and shrimp passing overhead on the tide. Finding flounder means finding ambush points: the right combination of current, cover, and proximity to where bait concentrates.

Spring is the first prime window. April through June brings a consistent flounder bite as fish move from nearshore wintering areas back into the inshore system. Breach Inlet between Isle of Palms and Sullivan's Island is one of the most reliable spring flounder addresses in the Charleston area — the tidal exchange through that cut flushes bait and concentrates fish on both incoming and outgoing tides. The Stono River inlet, Folly River channels, and harbor entrance edges all produce spring doormats from late March through early June.

September and October bring the fall migration — flounder move from the back creek systems toward the inlets and nearshore as water cools. This is when the biggest fish of the year are caught in Charleston. Gigging at night (legal in South Carolina) peaks in September and October as flounder stage in sandy-bottom channels and along lit dock pilings. The combination of fall tidal movement, cooling water, and concentrated baitfish makes September flounder fishing in the Charleston system second only to fall redfish in terms of local excitement.

Where they live

Sandy bottom adjacent to hard structure — channel edges, dock pilings, inlet jetty rocks, sandbar drop-offs — is the core flounder address in Charleston. Breach Inlet, the Stono Inlet channel edges, and the Folly River flats near the inlet are the highest-density flounder areas. Any creek mouth where current slows and bait collects will hold fish. Bridge pilings over sandy-bottom channels produce year-round. In fall, the harbor entrance edges and shallow nearshore areas adjacent to inlets hold the largest concentration of pre-migration fish.

When they bite

Both incoming and outgoing tides produce flounder — what matters is the presence of moving water and nearby bait. On incoming tides, flounder position at the downcurrent side of dock pilings, channel edges, and sandy pockets waiting for bait to wash past. On outgoing tides, creek mouths and inlet edges are the primary targets as draining water funnels shrimp and baitfish past ambush points. Slack water is generally the worst time for flounder — they need current to bring food to them.

Flounder feed throughout the day when tidal movement is right — this is less of a dawn/dusk species than speckled trout or redfish. That said, early morning and late afternoon consistently produce in warm months when other species slow down. Night gigging at low tides in September and October is a uniquely productive and social Lowcountry tradition — any shallow sandy flat with 2 to 4 feet of visibility near structure is worth poling with a gig.

How to catch them

Bait: Live finger mullet is the top flounder bait in Charleston, particularly in fall. Hook through the lips on a Carolina rig with a 1/0 to 3/0 wide-gap hook and allow it to work near the bottom with minimal weight — just enough to keep the bait down in current.

Technique: Drift-fishing with live bait along channel edges is the most effective method for covering water and finding concentrations of flounder. On incoming tide, drift from open water into a creek mouth, dragging bait along the bottom.