Hawaii’s Must-Try Seafood: From Ahi to Opah, A Deep-Sea Culinary Adventure

At the Honolulu Fish Auction near Pier 38, buyers inspect up to 50 tons of fish daily, taking a notch from each tail to assess fat content and freshness before bidding. From that single marketplace, fish are loaded onto overnight flights to the U.S. mainland, Canada, Japan, and Europe, but the best of the catch stays local — and Hawaiians eat roughly three times as much fish per person as the rest of the country, according to auction manager Brooks Takenaka. This article cuts through the menu jargon to explain which Hawaiian fish to order, how they taste, what to look for, and why the same species can differ wildly in quality depending on who caught it and how it was handled.

Walking into a Hawaiian restaurant and seeing “local fish” on the menu doesn’t tell you much — the term typically refers to fish caught in Hawaiian waters by independent fishermen, but the species changes daily based on what the auction delivered that morning. The difference between a seared ahi steak that tastes like lean beef and one that melts like butter comes down to whether you’re eating yellowfin or bigeye, and most menus won’t specify.

Understanding Hawaii’s Fish Markets and Menu Terminology

Ahi dominates menus across the islands, but it’s not a single fish — it’s the Hawaiian name for two distinct species of tuna. Yellowfin tuna has bright red flesh, is leaner, and carries a milder flavor, while bigeye tuna has a higher fat content, a richer buttery texture, and a deeper red color. Bigeye is the more valued variety at auction, recognized by its plump body and larger head and eyes, and it’s the fish you want when ordering sashimi or tataki.

The Honolulu Fish Auction is one of the few fish auctions between New England and Tokyo, and its daily volume — up to 50 tons — sets the baseline for what ends up on plates across the state. From the auction floor at Pier 38, fish are distributed to local restaurants, grocery stores, and overnight flights to the mainland, which means the fish you eat in Honolulu on Monday was likely swimming on Sunday. That speed matters: fresh Hawaiian fish should have clear bright eyes, firm flesh, and a clean oceanic smell, not a strong fishy odor.

The Fish You’ll Actually See on Menus

Most Hawaiian restaurants rotate their fish selection based on what’s fresh, but a handful of species appear regularly enough to learn by name. Each has a distinct texture, fat content, and best preparation method.

Ahi: The Two Tunas You Need to Know

Ahi appears on menus in almost any restaurant in Hawaii, used for everything from raw poke to grilled steaks. The main season for ahi runs May through September, but it’s available year-round. When you see “seared ahi” on a menu, you’re getting fish cooked quickly on the outside with the inside left rare and tender — this works best with bigeye because its higher fat content keeps the center from drying out. Yellowfin works well in poke, where the leaner flesh holds its shape after marinating in soy sauce, sesame oil, and other seasonings. Ahi can also be served as a full steak, grilled or pan-fried, though this preparation is more common with yellowfin since bigeye’s richness can feel heavy when cooked through.

Mahi Mahi and Ono: The Reliable Whites

Mahi mahi, also called dorado, is versatile enough for grilling, pan frying, deep frying, and ceviche. Its firm white flesh holds up to bold marinades and doesn’t flake apart easily, which makes it a safe choice for anyone nervous about raw fish. Ono — the Hawaiian word for wahoo — is mild in flavor, sweet and buttery but firm and smooth in texture. It’s fairly lean and easy to overcook, so look for it prepared simply, often grilled or in soups like cioppino. Both species are widely available and rarely disappoint, but neither has the depth of flavor that opah or bigeye ahi deliver.

Opah: The Moonfish That Tastes Like Something Else

Opah, or moonfish, has light pink fillets that are soft and marbled with fat. It contains more oil than salmon, which gives it a texture closer to rich fish like mackerel than to white fish like mahi mahi. The flavor is distinctive — almost beefy — and it holds up well to grilling or broiling. Opah isn’t as common on menus as ahi or mahi mahi, but when you see it, order it. The high oil content means it stays moist even if the kitchen leaves it on the heat a minute too long, which happens more often than restaurants admit.

Opakapaka and Monchong: Deep-Water Favorites

Opakapaka, or pink snapper, is a delicate white fish without a fishy flavor, best prepared steamed, baked, broiled, or scored, fried and served whole. It’s caught at depths between 180 and 600 feet using hook-and-line gear, and it was once the catch-of-the-day for Hawaiian ancient kings. Monchong, or sickle pomfret, has firm moderate-flavored white flesh with pink tones, caught in deep waters more than 900 feet down. Its high oil content and long shelf life make it a favorite among chefs who want a fish that holds up through dinner service. Most monchong sold weighs more than 12 pounds, so you’re getting a substantial fillet.

When to Go and What to Order by Season

Fish availability in Hawaii follows seasonal patterns, though modern fishing methods keep most species available year-round. The table below breaks down what peaks when, based on auction data and local fishing reports.

The ahi season from May through September is when you’ll find the best selection and lowest prices for both yellowfin and bigeye. During winter, opah becomes more common and is often the best value on the menu because tourists don’t know to order it. Ono peaks in late spring through early fall, which aligns well with summer travel, but it’s available outside that window too — just expect slightly smaller fillets.

How to Eat Fish in Hawaii Like a Local

Locals don’t eat fish the same way tourists do. Poke shops, not restaurants, are where most Hawaii residents get their daily fish fix. The Hawaiian version of ceviche — diced raw fish marinated in soy sauce, sesame oil, and seasonings — is extremely popular with locals and Asian visitors, and ahi is a favorite main ingredient. You’ll find poke at grocery stores, lunch counters, and dedicated shops across every island.

Poke Etiquette and Quality Checks

Poke is pronounced “POH-keh,” not “POH-kee,” and ordering it from a grocery store deli counter is completely normal — Foodland and Times Supermarkets both have excellent poke programs. The key sign of quality is turnover: look for a busy counter where the fish is being restocked, not sitting under heat lamps. If the ahi looks brown or dry around the edges, skip it. Fresh poke should have bright red or deep red cubes with visible marbling if it’s bigeye.

What to Avoid and What to Seek

Au, or shortbill spearfish, is orange-pink in color, lean and mild in flavor, and very hard to find. If you see it on a menu, order it — it’s a rare treat that most visitors never try. Shutome, or swordfish, has fillets that are pale to pinkish but turn brownish once cooked, so don’t judge it by color alone. Skip anything labeled “fresh fish” without a species name unless you’re at a place you trust; that vagueness often means the kitchen is working through whatever didn’t sell yesterday.

Frequently Asked Questions About Hawaiian Fish

What is the most popular fish to eat in Hawaii?

Ahi — both yellowfin and bigeye tuna — is the most common fish on menus and in poke shops across the islands. It’s used for sashimi, poke, searing, and grilling, and its peak season runs May through September.

That said, popularity doesn’t always mean best value. Opah and monchong are less well-known to visitors but often deliver more flavor and better texture for the same price.

Is it safe to eat raw fish in Hawaii?

Yes, when you buy from reputable sources. The Honolulu Fish Auction enforces strict quality standards, and fish destined for raw consumption is handled separately from cooking-grade product. Look for bright, firm flesh with no brown edges or strong odor.

The bigger risk isn’t safety — it’s quality. A piece of ahi that looks fine can taste bland if it was frozen too long or handled poorly. Ask when the fish arrived, and if the answer is more than two days ago, consider ordering something else.

What is the difference between ahi and mahi mahi?

Ahi is tuna — either yellowfin or bigeye — with dark red flesh and a rich, meaty flavor. Mahi mahi is dorado, a firm white fish with a milder taste and flakier texture. They’re prepared differently: ahi is often served rare or raw, while mahi mahi is cooked through.

If you want something that tastes like the ocean, order ahi. If you want something safe and familiar that won’t challenge your palate, mahi mahi is the reliable choice.

Why is Hawaiian fish so expensive?

Hawaii’s isolation means most goods are imported, but local fish actually costs less than imported alternatives when it’s in season. The premium you pay at restaurants covers the auction markup, transportation from the pier, and the fact that local sourcing commands higher prices.

The real cost driver is demand: Hawaiians eat three times more fish than mainland residents, so local supply gets bid up by restaurants, grocery stores, and exporters competing for the same catch.

What is opah and why should I try it?

Opah, or moonfish, is a deep-water species with light pink fillets that are heavily marbled with fat — it contains more oil than salmon. The flavor is rich and almost beefy, and the texture stays moist even if overcooked.

It’s less common on menus than ahi or mahi mahi, which means it’s often overlooked by tourists. Order it grilled or broiled, and you’ll get a fish that tastes like nothing else you can find on the islands.

The Honolulu Fish Auction processes up to 50 tons of fish each day, and the best of that catch stays within a few miles of the pier — if you know what to look for. The difference between a forgettable fish dinner and one you’ll talk about for years isn’t about which island you’re on or how much you pay; it’s about asking the right questions and being willing to eat what’s actually fresh, not what sounds familiar. Skip the ahi if the opah came in this morning. Order the monchong if you’ve never heard of it. And if you find a gas station poke counter with a line of locals out the door, get in it.

Sources and further reading

Hawaiian fish guide: beyond ahi. One Naturalist, 2024.

The crazy fish of Hawaii. Bon Appétit, 2017.

7 must-eat fish from Hawaii. Sunny Maui Vacations, 2024.