Southern Flounder

Habitat Distribution

• A western Atlantic species ranging from the mid-Atlantic coast south and west through the Gulf of Mexico to northern Mexico, most abundant in the western Gulf.
• Equally at home in full saltwater, brackish estuaries, and tidal rivers that push well into nearly fresh water — one of the more salinity-tolerant flatfish in its range.
• Adults work shallow coastal waters down to about 130 feet, but the bulk of inshore fishing happens in water under 20 feet across bays, sounds, and tidal creek systems.

Specific Spots

• Mud-bottom tidal creeks are the core habitat — flounder lie buried in the soft substrate and intercept baitfish and shrimp pushed by tidal flow, so the most productive zones are where current accelerates through a narrowing or bends around a point.
• Salt marsh edges flood at high tide and draw flounder up to feed; as the tide falls, those fish slide back to the creek channel edges and the first drop-off, stacking briefly in a predictable transition zone.
• Hard structure set in soft bottom — jetties, bridge pilings, oyster bars, dock edges — concentrates forage and gives flounder a current break to hold just downcurrent of, where prey gets funneled past without the fish having to move.
• Open mud flats adjacent to deeper channels are worth a slow drift — fish here are spread rather than stacked, buried into the substrate across a wide area rather than holding on a single piece of structure.