Best Offshore Saltwater Fishing Guide – Tuna, Mahi, and Marlin Tips

Detailed Reviews

Offshore fishing delivers the most extreme fishing experiences available — charging bluefin tuna, jumping mahi-mahi, and the once-in-a-lifetime possibility of a marlin on the end of your line. While more demanding in terms of boat, tackle, and preparation, offshore fishing rewards well-prepared anglers with trophy fish and incredible memories. This guide covers the fundamentals of targeting offshore species.

▶▶ Watch Expert Video Guide on YouTubeClick to open on YouTube

Essential Offshore Safety

Before covering tactics, safety must come first. Offshore waters change rapidly — conditions that were calm at departure can become dangerous by the time you return. Always file a float plan, carry a marine VHF radio, wear a inflatable life jacket, and never venture offshore alone. Monitor weather continuously during the trip and always return before conditions deteriorate.

Yellowfin and Bluefin Tuna

Tuna are the ultimate offshore target — explosive runs, powerful fights, and exceptional sashimi-grade meat make them the most sought-after pelagic species. Find tuna by locating birds (particularly frigate birds) diving on baitfish, temperature breaks (where cooler and warmer water masses meet visible as a color change on the surface), and floating debris or weed lines that concentrate baitfish underneath.

Best Tuna Lures and Techniques

Cedar plugs are classic trolling lures for bluefin and yellowfin — simple, effective, and have been catching tuna for over 60 years. Spreader bars with daisy chains of small squid imitations create the impression of a large baitfish school and draw tuna from distance. When tuna are actively busting on bait, popping lures and stickbaits cast into the melee produce explosive topwater strikes.

Mahi-Mahi (Dolphin Fish)

Mahi-mahi are the most colorful offshore fish — brilliant yellow, green, and blue with an ability to change colors as they’re excited. They’re almost always found near floating debris, weed lines, and FADs (Fish Aggregating Devices). Mahi school heavily and are highly aggressive — once one is hooked and kept in the water alongside the boat, others in the school will remain nearby and can be caught on every subsequent cast.

Best Mahi Lures

Dolphin fishing lures include everything from large feather jigs trolled behind the boat to bucktail jigs cast to the school alongside the boat. Small live pilchards and ballyhoo are the premier live and dead bait options for trolling. When a mahi is on the line, never bring it in the boat until everyone else has a bait in the water — the school will follow and create a feeding frenzy.

Sailfish and Marlin

Billfish are the pinnacle of offshore fishing — large, fast, and acrobatic fighters that test every piece of equipment and every angler’s endurance. Most billfishing is done on a catch-and-release basis given the conservation concerns and regulatory requirements around these species.

Rigged ballyhoo is the most widely used bait for sailfish trolling. Ilander lures with ballyhoo “skirted” behind them create the perfect combination of action and profile. Marlin anglers deploy larger skirted trolling lures in the 9-12 inch range with heavy monofilament or cable leaders.

Offshore Fishing Gear

Offshore fishing demands heavy, high-quality gear. Heavy conventional reels like the Penn International and Shimano Tiagra series are the professional standard for large tuna and billfish. Match them with offshore trolling rods in 50-80 lb class. Use the highest quality monofilament or braided line appropriate for your target species.

Bottom Line

Start with mahi-mahi for your first offshore experience — they’re the most accessible, most common, and most forgiving offshore species. A cedar plug and some feather jigs trolled at 7-9 knots along a weed line will produce action on any offshore trip. As experience builds, target tuna and eventually billfish for the ultimate offshore challenge.