I've been spearfishing Oahu's waters for over 25 years. I've watched guys fly in from the mainland, rent the wrong gear, hit the wrong spots at the wrong time — and go home empty-handed. This guide is everything I wish someone had handed me when I was starting out. Read it, save it, share it with your dive buddy.
Understanding Oahu's Waters
Oahu isn't one ocean — it's four coastlines with completely different character. The west side (Waiʻanae coast) is big structure, deep ledges, and some of the largest ulua on the island. The north shore (country side) is shallow reef in summer, completely undiable in winter. Town side (south shore) is accessible but fished hard. East side is wild, surgy, and holds serious fish if you know where to look.
Wind and swell dictate everything. When the trades are pumping hard from the northeast, the windward (east) side gets blown out. That's your west side day — Makaha and Nānākuli clean up nicely in northeast trades. When you get that rare Kona weather (south winds), the north shore and east side can go glass-flat and open up spots you can't access any other time.
Top Spearfishing Spots on Oahu — By Coastline
West Side (Waiʻanae Coast) — Where the Big Fish Live
The west side is where serious Oahu spearfishers go when they want a real shot at trophy fish. Less boat traffic, deeper structure, excellent visibility on trade wind days, and fish populations that benefit from lighter pressure than town-side spots.
Makaha is the crown jewel of west side spearfishing. The ledges off Makaha drop into deeper water with overhangs and caves that hold big ulua (giant trevally) and kahala (amberjack). If you're going for ulua at Makaha, you need a gun to match — minimum 110cm, two bands, 8mm shaft, and strong reel line. These fish fight hard and they know the ledges better than you do. Papio (juvenile ulua under about 10 lbs) are more common and a great target if the big ones are being elusive.
Nānākuli offers shallower reef structure with good populations of uhu (parrotfish) and kumu (whitesaddle goatfish) — one of the most prized eating fish in Hawaii. Kumu tend to run along sandy bottom edges near the reef in the 30–50 foot range. A 90–100cm gun with one to two bands is dialed for this kind of hunting.
Mākaha Caverns is a well-known dive site with dramatic underwater terrain — caves, arches, and ledges that hold menpachi (soldierfish) and aweoweo (bigeye) tight to the structure. When you're working caves, you want a short, maneuverable gun — 60–75cm — or even a pole spear. Big guns can't track through tight quarters.
North Shore (Country Side) — Summer Gold, Winter Closed
In summer, when the north swells die and the ocean goes flat, the north shore becomes one of the best spearfishing coastlines in the state. The reefs are diverse, visibility is excellent, and the fish are big. In winter, swells hit 20–40 feet and diving is off limits. Wait for summer.
Pūpūkea / Three Tables — The MLCD boundary means no spearfishing inside the protected zone, but the reef immediately outside holds uhu, kala (unicornfish), and papio. A 75–90cm gun is perfect for the shallower reef work here.
Laniākea / Haleʻiwa area — when the ocean is flat and conditions cooperate, mu (bigeye emperor) school up around structure in the 40–60 foot range. A 100–110cm gun lets you take shots before they spook.
Waimea Bay — in summer, the bottom structure off the point is productive. Big open-water fish occasionally move through. Local knowledge is key here — the bottom contour and current patterns change everything.
East Side — Wild Water, Big Rewards
The east side is more exposed, more surgy, and requires more experience to dive safely. But the fish-to-diver ratio is often better than accessible spots, and the structure is incredible.
Portlock / Koko Head — The rocky, irregular bottom drops into deeper water with ledges holding ulua, kumu, and mu. Surge can be serious here — not a beginner's spot. Best on a calm summer morning. Gun of choice: 100–120cm, 2 bands, stout shaft.
Makapu'u — south of the point, the bottom drops quickly. Kumu and mu are the primary targets at 40–80 feet. Shore entry is tough; most serious divers boat in. Flat summer mornings only.
Alan Davis / Sandy Beach corridor — more accessible for intermediate divers. Papio are common, along with uhu and weke (goatfish). A 90cm gun handles most of what you'll encounter here.
Know Your Fish
- Ulua (Giant Trevally): The king. Big, fast, powerful. Minimum size limits apply — check current DLNR regs. Hunt the deep ledges at Makaha and Portlock.
- Papio (Juvenile Ulua): Great eating, fun to hunt. Common on open reef across the island — Sandy Beach, Nānākuli, north shore in summer.
- Kumu (Whitesaddle Goatfish): Pink and white, found on sandy bottom near reef edges. One of the best-eating fish in Hawaii. Hunt the sand-reef interface at 30–60 feet.
- Mu (Bigeye Emperor): Schools around structure at depth. Excellent eating. Found deeper, often in groups — pick your shot carefully.
- Menpachi (Soldierfish): Red cave dwellers. Dawn and dusk feeders. Short gun, slow approach, patience. West side caves and anywhere with ledge overhang.
- Uhu (Parrotfish): Common on shallower reefs. Excellent eating. Great for learning to shoot accurately — Nānākuli, Sandy Beach, north shore reef.
- Kala (Unicornfish): Common, decent eating, and the horn makes them unmistakable. Good practice fish on shallower reef.
- Kahala (Amberjack): Found around deeper structure, especially west side. Big, strong fighters. Excellent eating.
Gear Matched to the Spot
- Cave hunting menpachi (Mākaha Caverns, west side ledges): 60–75cm or pole spear. Silent and maneuverable.
- Shallow reef (Nānākuli, Sandy Beach, north shore summer): 75–90cm, single band. Uhu, papio, kala.
- Mixed reef and moderate depth (most Oahu diving): 90–110cm, 2 bands. Kumu, mu, papio. This covers 80% of Hawaii scenarios.
- Ledge hunting ulua (Makaha, Portlock, Makapu'u): 110–130cm, 2 bands, 8mm shaft, reel. Serious gear for serious fish.
Safety First — Always
Shallow water blackout kills experienced divers every year in Hawaii. Never hyperventilate before a dive. Never dive alone. Your buddy stays on the surface watching you — not diving at the same time. Float and flag is non-negotiable, especially on the west side and east side where boat traffic is real.
Check NOAA buoy reports and Surfline before every session. If it looks sketchy from shore, it's worse in the water.
Come See Us Before You Go
At Hana Paʻa, we outfit divers for these exact spots. We fish these waters. Come in, tell us where you're planning to dive and what you're after, and we'll make sure you're set up right.