Windward Big Island port working the wetter, less-fished east side — ahi and ono on the offshore weed lines, ulua and papio shore-casting along the rocky coast, and reef fishing inside the bay.
Part of the Hawaiian Islands region.
Biting right now — 8 species are worth targeting in September here, and the 5 marked Peak are at their best right now.
Tap any species for how to identify it, when it runs and what to throw. This is when the fish are active here — check the regulations below before you keep anything.
The Wailoa River mouth shoals heavily, worst through the winter, and the fixed highway bridge at the entrance carries just 12 feet of clearance — Coast Pilot advises anything drawing more than 4 feet not to attempt the river. Lights mark the entrance.
Hilo Bay is the only sheltered harbor or anchorage in the 77 miles between Upolu Point and Kumukahi; the coast either side is bold and cleared by a 2-mile berth. After heavy rain the Wailoa and Wailuku rivers set a current north through the inner harbor.
The lettered FADs off this coast all sit in deep water, each measured from the Hilo Bay breakwall light: Leleiwi (E) at 8.7 nm in about 920 fathoms, Pepeekeo (G) at 14.1 nm in 578, and Hakalau (HK) at 15.0 nm in 890.
Most small craft here berth at Wailoa River Small Boat Harbor, 0.1 mile inside the river mouth — the practical base for the bay and for the deep water off Leleiwi Point.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Bonefish (O'io) | ||||||||||||
| Ulua (Giant Trevally) | ||||||||||||
| Bluefin Trevally (Omilu) | ||||||||||||
| Papio (Juvenile Trevally) | ||||||||||||
| Kawakawa |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ulua (Giant Trevally) | ||||||||||||
| Bluefin Trevally (Omilu) | ||||||||||||
| Aku (Skipjack Tuna) | ||||||||||||
| Mahi-Mahi | ||||||||||||
| Kawakawa | ||||||||||||
| Ono (Wahoo) |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pacific Blue Marlin | ||||||||||||
| Ahi (Yellowfin Tuna) | ||||||||||||
| Bigeye Tuna | ||||||||||||
| Ono (Wahoo) | ||||||||||||
| Mahi-Mahi | ||||||||||||
| Aku (Skipjack Tuna) |
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Typical: 18–28 in, 2–8 lb
Tell it apart: The conical snout overhanging a small under-slung mouth, combined with bright chrome flanks and a deeply forked tail, is unmistakable - no other Hawaiian gamefish has that pointed nose set over an inferior mouth.
Typical: 24–40 in, 10–40 lb
Tell it apart: Steep blunt forehead, large size, and a plain silver-to-grey body with no blue fins and no spots separate it from the spotted, blue-finned Omilu.
Easily confused with: Bluefin Trevally (Omilu)
Typical: 14–24 in, 2–10 lb
Tell it apart: Bright blue fins plus fine black-and-blue speckling across the back instantly mark Omilu, versus the plain grey, steep-headed Ulua.
Easily confused with: Ulua (Giant Trevally), Papio (Juvenile Trevally)
Typical: 12–24 in, 1–8 lb
Tell it apart: Papio is simply a young trevally - confirm the bony scutes on the rear lateral line, then check for blue fins and spots (Omilu) or a plain steep-headed grey body (Ulua) to pin the species.
Easily confused with: Bluefin Trevally (Omilu)
Typical: 18–28 in, 5–15 lb
Tell it apart: Broken wavy markings confined to the UPPER back, plus a few dark spots low between the pectoral and pelvic fins, distinguish Kawakawa from Aku, which has clean horizontal stripes on the LOWER belly and a plain back.
Easily confused with: Aku (Skipjack Tuna)
Typical: 18–30 in, 5–20 lb
Tell it apart: Straight horizontal stripes running along the belly and a plain unmarked back separate Aku from Kawakawa, whose markings are wavy, confined to the upper back, with spots low on the chest.
Easily confused with: Kawakawa
Typical: 30–48 in, 10–30 lb
Tell it apart: The single full-length dorsal fin running head to tail over a thin, deep, glowing green-gold body is unique - no other Hawaiian pelagic has that continuous dorsal.
Typical: 34–50 in, 8–30 lb
Tell it apart: An elongated tubular body with vertical blue tiger bars and a toothed beak-like jaw identifies Ono - it has no rigid spear/bill, unlike a marlin.
Easily confused with: Pacific Blue Marlin
Typical: 80–300 lb
Tell it apart: The rigid round spear bill and a pointed dorsal fin shorter than the body depth confirm a marlin; Ono has a toothed beak and a long low body, never a bill.
Easily confused with: Ono (Wahoo)
Typical: 30–50 in, 20–100 lb
Tell it apart: Very long curved yellow second dorsal/anal fins, a bright yellow side stripe, and a normal-sized eye separate Yellowfin from Bigeye, which keeps short fins, a larger eye, and a longer pectoral.
Easily confused with: Bigeye Tuna
Typical: 40–60 in, 60–150 lb
Tell it apart: Short second dorsal/anal fins, a noticeably larger eye, and a long pectoral fin reaching past the second dorsal origin mark Bigeye, versus the long sweeping yellow fins and yellow side stripe of Yellowfin (Ahi).
Easily confused with: Ahi (Yellowfin Tuna)
Hawaiian tides are small (~2 ft range) — what matters most is moon phase, which drives stronger tidal flow and pushes bonefish onto flats and trevally tight to structure; plan offshore trips to beat the trade winds, which typically build to 15–20 kt by midday.
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