By Mr. Phoenix - Hoang Anh Nguyen, Cat Ba Nomad · Last updated 24 August 2026 · Written on Cat Ba Island

Cat Ba eats what the bay produces that morning. That means shellfish you will not find inland, one dish that comes with a genuine safety warning, and a noodle soup from Hai Phong that is worth ordering for breakfast every day you are here. This is what to look for and how to order it.

How ordering seafood works here

In most Cat Ba seafood restaurants you choose the animal from a tank and the kitchen cooks it. Price is by weight, and the weight is taken in front of you. Two things save arguments later: ask for the price per kilo before the tank is opened, and confirm the cooking method at the same time. Nobody minds being asked, and the places that do mind are the places to leave.

1. Tu hai, geoduck

The signature shellfish of the archipelago and the one locals will recommend first. Sweet, dense, faintly crunchy. Best grilled with spring onion oil and peanuts, or steamed plainly if you want to taste the animal rather than the garnish. Farmed around Cat Ba, so it is fresh and consistently available.

2. Sam bien, horseshoe crab

Served grilled, fried with lemongrass and chilli, or shredded into a sweet and sour salad. Strong, rich, and a genuine local specialty rather than a tourist novelty.

One real caution. Sam is edible. Its lookalike, called so bien, is not, and it carries a toxin that causes serious poisonings in Vietnam every year. Order it only in an established restaurant where the kitchen knows the difference. Never buy it from an informal stall or accept it from a boat.

3. Cua xanh, green crab

Firm, sweet meat. Steamed with beer is the standard treatment and the best one. Stir fried with tamarind is the sweeter, stickier alternative if you like a sauce to work through.

4. Be be, mantis shrimp

Ugly, armoured, and better than lobster for the money. Grilled with salt and chilli, or steamed. Ask the kitchen to butterfly the shell, otherwise you will spend the meal fighting it and lose.

5. Hau nuong mo hanh, grilled oysters

Oysters grilled over charcoal with spring onion oil, crushed peanuts and a squeeze of lime. Cheap, fast, sold everywhere along the harbour front in the evening. The reliable low risk order for anyone unsure about the tank.

6. Nom sua, jellyfish salad

Cold, crunchy, sharp with lime and herbs, topped with roasted peanuts. Seasonal, mostly spring. If you have written jellyfish off without trying it, this is the dish that changes minds, the texture is closer to a firm noodle than anything you are imagining.

7. Oc bien, sea snails

An entire category rather than a dish. Dozens of varieties, steamed with lemongrass and ginger or stir fried with tamarind, eaten with a pin and a beer over a long evening. Order a mixed plate and let the kitchen choose what came in that day.

8. Ca song, grouper

The premium fish of the bay, usually kept live in tanks. Steamed with ginger and soy is the classic preparation, and it is the one to pick if you want to understand why this fish costs what it costs. Also excellent in a hotpot for a group.

9. Nem cua be, crab spring rolls

A Hai Phong specialty that travelled the short distance to the island. Square rather than cylindrical, crisp, packed with crab and vegetable. Order them as a starter for the table, they are the one dish everyone at dinner will finish.

10. Muc and bach tuoc, squid and octopus

Grilled whole over charcoal, stuffed with pork and mushroom, or stir fried. Cat Ba squid is caught at night by the boats you see lit up on the water from the harbour. Ask for grilled with salt, pepper and lime rather than a heavy sauce.

11. Rong nho, sea grapes

Green seaweed that looks like miniature grape clusters and pops between the teeth with a clean saltiness. Eaten fresh with a dipping sauce as a side. Light, cheap, and a useful counterweight to a table of grilled shellfish.

And one thing to eat for breakfast

Banh da cua, the Hai Phong crab noodle soup. Flat reddish brown noodles, crab paste broth, greens, sometimes fried fish cake. It is the regional dish of this coast and it is a better breakfast than the hotel buffet every single morning. Seafood banh mi from the street carts is the portable version.

Quick reference

Three practical rules

• Eat where the tanks turn over. A busy restaurant with half empty tanks at 9pm is a good sign. Full tanks at 9pm are not.
• Confirm price per kilo before cooking. Every time, politely, including at places you have eaten before.
• Skip seafood in a storm week. When the boats cannot go out, what is on the ice has been there a while. In July and August this happens more than you would think.

What things actually cost at the table

Seafood here is sold by weight from the tank, so a bill is only as big as what you point at. These are the bands to expect rather than fixed prices, because everything moves with the season and with what the boats brought in.

Two habits keep the bill sane. Confirm the price per kilogram before the tank is opened, every time, including at a place you have eaten before. And weigh in front of the table, which every honest kitchen here is happy to do.

Eating around the island, not just in town

Most visitors eat every meal on the harbour front strip, which is fine but narrow. Three alternatives worth the trip.

• Floating restaurants in Lan Ha Bay. Reached on a boat day. The fish is pulled from the pens under your feet. Bay sightseeing fee of 120,000 VND per adult applies to the boat leg regardless.
• Viet Hai village lunch. Chicken raised in the valley, garden vegetables and whatever came out of the bay. Comes with most village day trips.
• Cai Beo floating village. One of the oldest fishing settlements on this coast and still a working one, not a set.

Seasonality, because it decides what is good

Jellyfish salad is a spring dish and it is not worth ordering out of season. Squid is at its best in the warmer months, which is when you see the fishing lights strung across the water at night from the harbour. Oysters and snails are reliable all year.

The bigger seasonal point is weather. In July and August, when the coast averages 250 to 280 mm of rain across 16 to 17 wet days and the typhoon risk peaks, boats stay in port for days at a time. What is on ice then has been there a while. In a storm week, eat the pork and the noodles and save the tank for a calm day. Full month by month detail in our weather guide.

Frequently asked

Related: Things to do on Cat Ba and doing Cat Ba on a budget.