2 weeks ago · Updated 2 weeks ago
Key Largo, located in the upper Florida Keys, offers anglers a diverse range of saltwater fishing opportunities from the backcountry to offshore reefs and wrecks. September brings warm waters and active fish, with both inshore and offshore species available to target.
Weekly Catches
No verified catches in the last 7 or 15 days; the catches below cover the last 21 days.
Mahi-Mahi (Dolphin Fish)
Offshore action for mahi-mahi remains strong in the waters near Key Largo, with these fast-growing, colorful fish providing consistent bites. Anglers are reporting plentiful schools and the chance for some of the largest mahi of the season during late September. Mahi are known for their acrobatic fights and are a favorite for both sport and table fare.
- Best action found offshore, targeting weed lines and floating debris.
- Effective baits include live pilchards and trolling artificial lures.
- Fish up to 20 pounds have been reported, with larger individuals possible as the season progresses.
Yellowtail Snapper
The yellowtail snapper bite has been described as plentiful and reliable on the reefs near Key Largo. These fish are a staple for local anglers and are prized for their taste and steady action. Limiting out on "flags" (larger yellowtail) is routine for many trips.
- Hotspots include patch reefs and deeper reef edges.
- Morning trips yield the best results due to cooler water temperatures and increased fish activity.
- Cut bait and small jigs tipped with shrimp are effective.
Mutton Snapper
Mutton snapper are active on the deeper wrecks and reefs, with quality-sized fish being caught. The bite is described as fast-paced, especially for those targeting structure in deeper water.
- Focus on deeper wrecks and ledges for larger muttons.
- Live pinfish and ballyhoo are productive baits.
- Fish in the 10–20 pound range have been reported.
Mangrove Snapper
Mangrove snapper are post-spawn but remain aggressive and available in good numbers around Key Largo. Larger fish are being caught, especially around structure and mangrove shorelines.
- Target mangrove edges, bridges, and inshore wrecks.
- Live shrimp and small pilchards work well.
- Fish up to several pounds are common, with larger specimens possible offshore.
Grouper
Grouper action continues on the reefs and wrecks, with fish up to 20 pounds reported. While the season for certain grouper species is limited, anglers are still finding success where regulations permit.
- Focus on rocky bottom and artificial reefs for best results.
- Large live baits such as pinfish and grunts are effective.
- Morning trips are recommended to avoid the midday heat and slower bite.
Permit
Permit are present on isolated wrecks and are considered a prized catch for sport anglers. This period is productive for those targeting permit, especially as the region moves toward mid-September and October.
- Look for permit on wrecks and sandy flats adjacent to structure.
- Live crabs are the preferred bait.
- Permit are known for their powerful runs and challenging fights.
Cobia
Cobia are being found on the reef and around most wreck sites, often traveling in small groups near the surface. These fish provide exciting action and are present in the area through December.
- Target cobia near wrecks and channel markers.
- Live pinfish and jigs are productive.
- Fish range from 15 to over 50 pounds.
Jacks & Amberjack
Large jacks and amberjack are patrolling the deeper wrecks, providing a strong fight for light tackle anglers. Jacks up to 20 pounds are common, and amberjack remain available for those seeking a workout.
- Focus on deeper wrecks and artificial reefs.
- Vertical jigs and live bait are effective.
Barracuda & Sharks
Barracuda are aggressive and common on the reefs and wrecks, while several species of sharks (including bull sharks and occasional hammerheads) are patrolling these areas. These predators add excitement and challenge to any trip.
- Target barracuda with flashy lures and tube baits.
- Sharks are often encountered while bottom fishing for snapper and grouper.
Weather & Marine Conditions
September in Key Largo is characterized by high water temperatures and humidity, with the potential for tropical weather systems. Anglers are advised to plan for early morning departures to take advantage of cooler conditions and more active fish. Calm seas are typical on the reef, making it a comfortable time for those concerned about rough water.
Tides & Solunar Activity
Fishing success is highest during morning high tides and periods of increased solunar activity. Late afternoon hours tend to be slower, especially in the shallows, due to elevated water temperatures and reduced fish movement.
Fishing Conditions & Tips
For the best results, anglers should focus on half-day or three-quarter day trips, targeting the early hours. Offshore anglers should look for floating debris and weed lines for mahi, while reef and wreck anglers will find snapper and grouper action most reliable in the morning. Use live bait for larger predators and structure-oriented species, and adjust tactics based on water clarity and current strength.
Regulations & Notices
The gag grouper season in Gulf state and federal waters (excluding Monroe County) is open from September 1 through September 14, 2025, with a bag limit of 2 gag grouper per person per day (within a 4-grouper aggregate) and a minimum size of 24 inches. A Florida Saltwater Fishing License and State Reef Fish Angler designation are required for recreational anglers. Always verify the latest regulations before heading out, as seasons and limits are subject to change for conservation purposes.
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