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Deep sea charters, blue marlin, yellowfin tuna, and Pacific sport fishing
Guam's position near the deep waters of the Mariana Trench makes it one of the region's best sport fishing destinations. Game fish are abundant year-round just minutes from the marina — mahimahi and wahoo dominate autumn through early spring, while blue marlin and yellowfin tuna peak in summer, reaching their height in July and August. Charter operators including Heritage Boat Charters (MV Dorado, a 40ft Bluewater vessel for long-range bank trips), Aquaman Charters (USCG-licensed captains), and Rockstar Charters (58ft Riviera sport fisher) offer half-day and full-day trips for beginners and experienced anglers alike. Fishing requires no personal licence for visitors aboard a licensed charter.
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Deep-sea fishing charters in Guam launch from Apra Harbour and Agat Marina, typically motoring 20–40 minutes to productive fishing grounds at the edge of the Mariana Trench drop-off. Half-day trips (4–5 hours) are ideal for first-timers or families and typically yield wahoo, mahimahi, and barracuda. Full-day trips (8–10 hours) venture further for blue marlin, sailfish, and yellowfin tuna. Trolling is the predominant technique for pelagic species; bottom fishing rigs target red snapper, grouper, and emperor fish over reef structures. Most charter operators include all equipment, bait, and tackle — visitors need only bring food, drinks, and appropriate sun protection.
Fishing in Guam is productive year-round, but species vary seasonally. Wahoo (ono) and mahimahi peak from October through April — the dry-season months with calmer seas and better trolling conditions. Blue marlin and yellowfin tuna are most abundant from May through August, reaching peak concentrations in July when the island hosts its annual fishing derby. Barracuda, kawakawa (little tuna), and rainbow runner are caught year-round in shallower waters. Typhoon season (July–December) can bring rough sea conditions that cancel offshore trips — always check forecasts and charter operator advisories before departure. Sunrise departures (5:30–6 AM) are standard for optimal fishing conditions before afternoon swell increases.
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questions & answers
Is fishing good in Guam?
Yes — Guam is an excellent deep sea fishing destination. The island's proximity to the Mariana Trench means game fish are abundant year-round. Blue marlin, yellowfin tuna, mahimahi, wahoo, and sailfish are regularly caught on charter trips within minutes of leaving the marina.
What fish can you catch in Guam?
Guam's offshore waters are home to blue marlin, yellowfin tuna, mahimahi (dorado), wahoo, sailfish, barracuda, and giant trevally. Mahimahi and wahoo are the most common catches from autumn through early spring. Blue marlin and yellowfin tuna peak in summer — July and August see the largest concentrations.
How much does a fishing charter cost in Guam?
Deep sea fishing charters in Guam typically start from around USD 350 for a half-day trip (4 hours). Full-day trips (8+ hours) run USD 600–1,200+ depending on boat size and operator. Heritage Boat Charters operates the MV Dorado (40ft Bluewater) for long-range bank trips south of Guam. Military MWR offers subsidised 6-hour charters from USD 85 for eligible personnel. Most charters include gear, bait, and a licensed captain.
What is the best season for fishing in Guam?
Guam offers productive fishing year-round. Mahimahi and wahoo peak from autumn through early spring (October–April). Blue marlin and yellowfin tuna peak in summer, with July and August considered prime months. The dry season (December–June) generally offers calmer seas. Typhoon season (August–October) may occasionally impact trip availability.
Do I need a fishing licence in Guam?
Visitors fishing from a licensed charter boat in Guam's offshore waters do not need a separate personal fishing licence — the charter operator's permits cover all passengers. Shore fishing and freshwater fishing in Guam may require a local recreational licence. Confirm requirements with your charter operator before your trip.