When visitors fly into Hawaii and ask about spearfishing, they usually ask one question: "What kind of fish are out there?" The answer is complicated in the best possible way. Hawaii's reef and pelagic systems hold dozens of species worth hunting, each with its own behavior, habitat, and technique. Knowing the fish before you get in the water is half the hunt.
This is the guide I wish I had when I started. 25 years of diving these waters later, here's what you need to know about the fish — by their Hawaiian names, where to find them, and how to hunt them.
A Note on Regulations First
Hawaii has specific size limits, bag limits, and protected species rules for spearfishing. Some fish are completely off-limits. Some require minimum sizes. Before you get in the water, check the current DLNR Hawaii Division of Aquatic Resources regulations. They update periodically, and enforcement is real. Hana Pa'a is a local shop — we fish and dive legally, and we expect the same from our customers. The reef has to be there for the next generation.
The Target Species: What Oahu Spearfishers Actually Hunt
Ulua (Giant Trevally / Papio)
The ulua is the trophy fish of Hawaii spearfishing. Giant Trevally (GT) and their smaller juvenile form, papio, are arguably the most sought-after target in the islands. Ulua are smart, fast, and powerful — they're not going to hold still and let you line up a shot. They patrol ledges, channels, and deeper reef structure, often moving in small groups or solo at speed.
Papio (juvenile ulua under 10 pounds) are far more common in shallow reef zones and a great target for intermediate divers still developing their hunting technique. A legal size papio makes for some of the best eating in the islands.
Where to hunt: Deep ledges along the west side (Makaha, Nānākuli), channel openings, and deeper structure at Portlock on the east side. Ulua move — they're not reef fish, they roam. You hunt them by reading current and structure, not by sitting in one spot.
Depth: 20–80+ feet depending on the fish. Papio in 10–25 feet. Big ulua in deeper water off ledges.
Gun: You need power and range for ulua. A 110–130cm band gun or a pneumatic in the same range. No point lining up on a big GT with an 80cm gun — you need the penetration. Euro-style mid-handle guns with 2 bands are the local standard for serious ulua hunters.
Technique: Ambush over hunting. Find your ledge, descend and hold position, let the fish come to you. Chasing ulua burns oxygen and spooks the fish. Patience wins.
Kumu (Whitesaddle Goatfish)
Kumu is the most prized eating fish in Hawaii. Ask any local diver what they're most excited to come home with, and kumu is the answer more often than anything else. The fish is unmistakable — a reddish body with a distinctive white saddle marking near the tail. It's a bottom feeder, usually found working sandy patches and rubble areas adjacent to reef structure.
Kumu are not particularly fast or hard to approach — the challenge is finding them and getting to their depth. They tend to sit deeper than a lot of beginner divers are comfortable, often in the 40–70 foot range on the better spots.
Where to hunt: Sandy bottom adjacent to reef on the south and west sides. Makaha and Ko Olina area, Kahe Point, and scattered spots off the south shore. They're not everywhere — when you find a kumu spot, you protect it.
Depth: 40–80 feet. This is a fish that rewards divers who have developed real depth and bottom time.
Gun: Mid-range band gun, 90–110cm. Kumu aren't big fish (1–5 pounds typically), but you need enough range to close the gap. Accuracy over power.
Technique: Work the sand edges. Kumu will be rooting around in sandy patches — approach slowly from above and angle your descent away from the fish until you're in range. They spook if you come straight at them.
Uhu (Parrotfish)
Uhu is another highly prized table fish in Hawaii — firm white flesh, great flavor, and a beautiful fish to see on the reef. Parrotfish come in multiple species in Hawaii (uhu is the general Hawaiian term), and their coloration varies dramatically by sex and age stage. The terminal phase males are the most visually striking — bright blue-green with an orange beak.
Uhu are reef fish, which makes them easier to locate but sometimes tricky to approach — they feed in the open but can disappear into coral quickly when they feel threatened.
Where to hunt: Active reef zones across Oahu, from shallow south shore reef to the deeper structures on the west side. Good uhu populations at Pūpūkea (off the Marine Life Conservation District boundaries), Ka'ena Point area, and many west side spots.
Depth: 15–60 feet. More accessible depth range than kumu, which makes them a great target for intermediate divers building bottom time.
Gun: 80–110cm band gun. Standard setup — accuracy matters more than raw power for parrotfish.
Technique: Slow approach. Uhu are not fast movers but they're visually alert. Descend at an angle, move smoothly, and don't make sudden movements. They'll often give you a clean broadside shot if you're patient.
Roi (Peacock Grouper)
Roi is an invasive species introduced to Hawaii in the 1950s that has established itself across the islands. There are no bag limits or size restrictions on roi — DLNR actively encourages harvest. They're also good eating (despite what some locals will tell you — properly cleaned roi is a solid table fish).
For new spearfishers, roi is an excellent target. They're reef-associated, sit relatively still in holes and ledges, and don't move fast. You can get close. The challenge is the shot angle — you want a clean brain shot on roi because they're strong enough to swim off or twist into a hole if your shot placement isn't right.
Where to hunt: Everywhere. Roi are on virtually every reef system on Oahu. They've colonized from shallow to deep, east side to west side. Doing the reef a favor by taking them.
Depth: 10–60 feet. Often in ledges, holes, and undercut coral structures.
Gun: Short to mid-range — 60–90cm is plenty. Accuracy over range. The shot window on a roi sitting in a ledge is often tight.
Technique: Find the hole, get your angle, take a clean shot. Roi often sit facing out — a frontal head shot is usually your best option. Don't rush it.
'Ō'io (Bonefish)
'Ō'io are a flatwater shallow reef species found in sandy lagoons and flats — the same fish that fly fishermen pay thousands to catch on a fly rod in the Bahamas. In Hawaii, you can hunt them with a speargun in the shallows. They're fast, flighty, and move in schools over sandy bottom. Hunting 'ō'io is technical work — you need to read the school's movement and position yourself ahead of them, not chasing.
Where to hunt: Shallow sandy flats on the leeward side, lagoon areas, protected south shore areas. They feed in very shallow water — sometimes less than 3 feet.
Depth: 2–15 feet. This is shallow water hunting.
Gun: Short, maneuverable — 50–75cm. You're in tight quarters and need to move quickly.
Nenue (Rudderfish / Chub)
Nenue are schooling fish that congregate around structure, often in the mid-water column — not on the bottom like kumu or in holes like roi. They swim in large schools and can be taken in numbers when you find them. Not the most glamorous target, but reliable and good eating when prepared right.
Where to hunt: Around rocky structure, channel edges, offshore pinnacles. Common along the south shore and off Ka'ena Point.
Depth: 15–50 feet, often mid-water column.
Gun: 90–110cm — you need range because nenue school in open water, not up against structure. You're rarely getting close.
Species You Don't Touch: Protected & Restricted Fish
Hawaii has several species that are either fully protected or heavily restricted. Spinner dolphins, sea turtles (honu), monk seals — these are federal and state protected species. No exceptions, no gray area.
Certain reef fish species are also protected or have strict size limits. Humphead wrasse (Napoleon wrasse), certain grouper species, and aquarium fish are regulated. Check DLNR's current rules before every trip if you're unfamiliar — regulations update, and ignorance isn't a defense.
Knowing Your Water: Conditions Matter More Than Gear
Hawaii's dive spots are mood-dependent. Makaha on a calm west swell day is one of the most productive spots on the island — clear water, accessible ledges, strong fish populations. Makaha in a northwest swell is churned up and dangerous. Portlock on a calm south shore day gives you visibility to 80 feet. Same spot after heavy rain — 10 feet of vis and not worth the trip.
Checking surf reports and buoy data before you go isn't optional — it's how you dive safely and efficiently. We use Surfline and the NOAA buoy data for the Oahu South and West Shore buoys. Learn to read them and your success rate goes up significantly.
The Right Gun for the Right Fish
Different targets demand different setups. If you're building out your first real spearfishing kit, come into Hana Pa'a and tell us what you're trying to hunt. We'll set you up with the right gun length, band configuration, and shaft weight for your specific target. Generic advice gets you generic results — we do this specific.