Florida · Keys
FLOUNDER FISHING
IN MARATHON
Marathon is a solid destination for flounder fishing. Book a charter and target flounder with local experts.
About Flounder Fishing in Marathon
A prized flatfish found along sandy bottoms and structure. Excellent table fare and fun to catch on light tackle.
Flounder are unique flatfish that lie camouflaged on sandy or muddy bottoms, ambushing prey from below. Gulf flounder and Southern flounder are the primary species in southern waters, while Summer Flounder (fluke) dominates from the Carolinas northward. Both eyes migrate to the top (left) side as juveniles, creating their distinctive flat profile. The "eyed" side is brown-green with irregular spots and blotches that change to match the surrounding bottom — a remarkable camouflage ability.
Scientific name: Paralichthys albiguttata
Flounder Seasonal Calendar — Marathon
Month-by-month availability for flounder in Marathon, FL.
How to Catch Flounder in Marathon
Techniques & Bait
Drifting live bull minnows (finger mullet or mud minnows) on a Carolina rig or knocker rig along sandy channel edges and drop-offs is the most productive method. Bounce a 1/4-3/8 oz jighead with a live minnow or Gulp! swimming mullet along the bottom near structure transitions (sand to mud, channel edges). "Flounder gigging" at night with underwater lights is popular in shallow bays. In passes and inlets, fishing the outgoing tide with live bait near the bottom produces the largest fish.
Recommended Tackle
Medium-light spinning rod (7 ft), 2500 reel, 10-15 lb braid, 20 lb fluorocarbon leader, 1/4-1/2 oz jig heads or Carolina rig with 1/0-3/0 wide-gap hooks. Patience is key — flounder often mouth the bait before committing, so wait for the second thump before setting the hook.
Best Inshore Fishing Spots in Marathon
Top spots where local captains target flounder and other inshore species.
Seven Mile Bridge
The historic Seven Mile Bridge connects Marathon to the Lower Keys and is one of the most famous fishing bridges in the world. Tarpon, permit, barracuda, and mangrove snapper congregate around the old bridge pilings during tidal changes. The bridge channel is a major tarpon migration corridor from April through July, with fish exceeding 100 pounds.
Boot Key Harbor
Boot Key Harbor is a large, protected harbor on the south side of Marathon offering sheltered inshore fishing for snook, mangrove snapper, yellowtail snapper, and tarpon. The harbor's docks, channel markers, and mooring balls provide structure that concentrates gamefish. Night fishing under the harbor lights produces consistent snapper and tarpon action.
Vaca Cut
Vaca Cut is a deep channel between Vaca Key and Fat Deer Key in the heart of Marathon, funneling strong tidal currents that attract tarpon, snook, and barracuda. The cut is narrow enough to cast across during outgoing tides when bait gets swept through the channel. Mangrove snapper and yellowtail snapper hold along the bridge pilings year-round.
Marathon Bayside Flats
The shallow flats on the Gulf side of Marathon stretch across expansive turtle grass beds toward the Content Keys and Nine Mile Bank. Permit, bonefish, and barracuda cruise the flats in skinny water, with guides poling skiffs for sight-fishing on calm mornings. The flats are less pressured than the Islamorada backcountry and offer excellent year-round fishing.
Other Species in Marathon
More fish you can target while visiting Marathon.
Flounder Fishing in Marathon — FAQ
Flounder fishing in Marathon is productive during .
Flounder fishing charters in Marathon are typically inshore trips. Prices vary by trip duration and group size. Most charters include all gear, bait, licenses, and fish cleaning.
Drifting live bull minnows (finger mullet or mud minnows) on a Carolina rig or knocker rig along sandy channel edges and drop-offs is the most productive method. Bounce a 1/4-3/8 oz jighead with a live minnow or Gulp! swimming mullet along the bottom near structure transitions (sand to mud, channel edges). "Flounder gigging" at night with underwater lights is popular in shallow bays. In passes and inlets, fishing the outgoing tide with live bait near the bottom produces the largest fish.
No — when you book a charter in Marathon, your captain provides all required Florida fishing licenses as part of the trip.
Flounder regulations in Florida include minimum size limits and bag limits that vary by season. Your captain will know the current regulations and ensure compliance.
While targeting Flounder in Marathon, you may also catch Blackfin Tuna, Mahi Mahi, Sailfish, Tarpon, Mangrove Snapper. Many charter trips target multiple species for the best action.
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