Halibut vs. Flounder: All You Need to Know

Oct 29, 2024 | 4 minute read Comments
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Reading Time: 4 minutes

Flounder and Halibut are some of the tastiest fish in the sea. They’re a fish counter classic. A favorite among seafood lovers worldwide. But what’s the difference between them? In this guide, you’ll learn to distinguish Halibut vs. Flounder. You can also find tips on where to catch them, and how to cook them once you do.

So what is the difference between Halibut and Flounder? Strange as it sounds, Halibut is Flounder. Flounder is the general name for a whole Flatfish family, including Turbot, Sole, Plaice, and more. Halibut is part of that family. The confusion comes from the fact that several species have “Flounder” in their name, while others, like California Halibut, aren’t actually Halibut at all.

Halibut vs. Flounder Identification

A diagram showing how to identify Halibut vs Flounder. There is an illustration of a Halibut and a Flounder at the bottom. Above is written: "1. Body Size: Halibut grow to be significantly bigger than Flounder. 2. Body Shape: Halibut are long and diamond-shaped. Flounder are shorter and round. 3. Tail Shape: Halibut have pointed, slightly forked tails. Flounder have rounded tails."

The easiest way to distinguish Halibut from other Flounders is by their sheer size. Halibut are much bigger than your average Flatfish, growing to 10 or even 20 times the size. In fact, the IGFA records for both Pacific Halibut and Atlantic Halibut (the only “true” Halibuts) sit at well over 400 pounds.

That’s great if you hook a trophy, but how do you recognize them if they’re small? Halibut are generally longer than other Flounders. Their pointed dorsal and anal fins also give them a signature diamond shape. On top of that, they have slightly concave tails ending in defined points. Most other Flounder have flat or rounded tails.

Finally, the unique thing about Flounders is that their eyes “migrate” across their face until both eyes are on the same side. They are either “right-facing” or “left-facing,” depending on which side their head is when their eyes are above their mouth (like in the picture above). Halibut are almost always right-facing. Other Flounders may face left or right depending on the species.

Where to Find Flounder and Halibut

a map infographic showing Halibut vs. Flounder distribution across North America

The general rule of thumb is that Halibut live farther north than other Flounder species. You can find Pacific Halibut from the western coast of Alaska down to the Northwestern United States.

The most iconic Halibut fishing waters are around Homer on the Kenai Peninsula. You can also find this monster Flatfish farther south, around Juneau or Vancouver Island, and all the way down to central California.

The California Halibut are actually a different subspecies, but many people consider them the same fish as their northern relative.

Atlantic Halibut start showing up around Cape Cod and live all the way up to Greenland and over into northern Europe. Halibut fishing isn’t as big on the East Coast, though. Atlantic Halibut is an endangered species, and it’s not a common target on charter trips.

Flounder live everywhere from the Gulf of Mexico to the Gulf of Maine and all along the US Pacific Coast down into Mexico. They’re hugely popular in Gulf Coast towns like Galveston, where they make up the “Big Three” inshore fish along with Redfish and Seatrout. They’re also a staple catch in California, Maryland, New Jersey – pretty much anywhere with a coastline!

Halibut vs. Flounder Taste

A piece of fried Halibut on a plate, with green beans behind it and chopped peppers and onions scattered on top. There are two slices of lemon on the left corner of the plate and a fork in the bottom left on a napkin.

Which tastes better? That’s the million dollar question. After all, people catch these fish for food as much as for fun. Halibut and Flounder taste pretty similar. Not surprising, considering they’re so closely related. The main difference is that Halibut is more firm and meaty, while Flounder tends to be delicate and flaky.

Halibut is also one of the least fatty fish you can buy. This, combined with its firm flesh and delicious taste, makes it perfect for frying or grilling. Flounder is slightly fattier and the fillets are much thinner. It’s a dream fish to fry or bake, but it’s tough to cook right on the grill.

However, The most important thing to think about is how fresh the fish is. If you catch it yourself or you know it’s fresh, go for Halibut. If you’re on the East Coast, Flounder is often a better choice just because it doesn’t have to come all the way from Alaska. Atlantic Halibut is a rare find these days, and it’s best to avoid eating endangered species if possible.

Halibut and Flounder: a Slice of Fishy Perfection

An angler in sunglasses and with his jacket hood on, standing on a boat in Alaska, holding a big Halibut he caught.

Halibut and Flounder are two of the country’s favorite fish. They’re a staple part of charter trips along the length of both seaboards. More than that, they define the history of places like Alaska. It’s easy to see why people love them so much: They’re healthy, delicious, and to top it all, they’re great fun to catch.

Sadly, Atlantic stocks are critically overfished. Pacific waters are carefully managed, though, and many fisheries are considered to be sustainable. On top of that, most smaller Flounders are doing fine. They live all around the US, so next time you’re in the mood for delicious fish, why not go out and catch one yourself?

What’s the biggest Flatfish you ever caught? Do you have a favorite way of cooking it? Drop us a comment with your fishing stories and cooking tips. We would love to hear from you!

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Rob

Sep 30, 2022

Used to live in Biloxi and gulf coast. Good lord I miss the fishing. Down there everyone just used gig and light at night for flounder. Used to get fresh jumbo shrimp for about 2.50/ lb. off the dock. And use the whole thing to hook up a nice red. But my favorite fish is King mackeral. I repair restaurant equipment and was always at “Shaggy’s on the beach” restaurant. He had 3 restaurant on the water. Chef was always giving me his latest creation.

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Harold Rose

Aug 24, 2022

Atlantic halibut is only allowed to be caught by commercial fishermen with a quota.
Here is a video of one I released while recreational fishing!
https://youtu.be/_I9yTREGRKo

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Destinie Burleson

Mar 18, 2022

I live on the Kenai Peninsula and fish all year long from shore and my boat. Alaska definitely has flounder and halibut. I prefer halibut buy far too any other fish. Flounder is good but doesn’t freeze well so unless you’re going to cook it the same day we throw them back. In Alaska we dipnet for salmon every year and every year we get flounder in our nets but throw them back.

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