Thailand has some of the best-value seafood on the planet: prawns the size of your hand, blue crab pulled in that morning, oysters shucked to order, squid charred over coals metres from the boat that landed it. The catch, so to speak, is that most of it is sold by weight, and that pricing model is exactly where unwary tourists get stung. Get one habit right, ask the exact per-kilo price and how it is weighed before anyone cooks anything, and you unlock the whole coastline at local prices.
This guide decodes the sold-by-weight menu, walks through the excellent seafood-market-plus-cook-shop model, tells you what to order on which coast and in which season, shows you how to check freshness yourself, and lays out the famous bill scandals as cautionary tales so you know what a sting looks like before it happens. Prices are in Thai baht with US dollars in parentheses at ฿33 = US$1 (July 2026), given as ranges because seafood prices swing with the season, the catch and your haggling.
Table of contents
- How sold-by-weight seafood pricing works
- Seafood prices at a glance
- The seafood market and cook-shop model
- What to order by coast and season
- How to check seafood is fresh
- The famous seafood bill scandals
- Is street seafood safe?
- Where to next
How sold-by-weight seafood pricing works
Most fresh seafood is priced per kilogram because that is how restaurants and markets buy it from the boats. The system is fair, but only when you control the order. The classic tourist sting works like this: you point at a nice-looking fish, staff carry it off to weigh and cook it, and the first time you see a number is on the bill, quoted at a per-kilo rate two or three times what a local would pay.
Beat it with one rule: treat the order as a transaction before it becomes a meal. Ask the price per kilogram. Ask whether that is live weight or cleaned weight, since a fish loses weight once gutted and scaled. Have your actual piece put on the scale in front of you, and get the total confirmed on a calculator or written down before you say yes to cooking it. A vendor who happily shows you the scale and the number is fine. One who won’t is the one to walk past. This is the same defensive habit that keeps you safe across Thailand’s tourist economy, and it overlaps with the broader patterns in our Thailand travel scams guide.
Seafood prices at a glance
| Item | Typical price range | Notes |
|---|---|---|
| Tiger prawns (grilled to order) | ~฿300-650/kg (US$9-20) | Andaman prawns often sweeter; price climbs at beachfront spots |
| Squid (grilled) | ~฿250-450/kg (US$8-14) | High-value, low-risk order almost anywhere |
| Blue swimming crab | ~฿300-600/kg (US$9-18) | Gulf coast staple; sold live by weight |
| Cook-shop cooking fee | ~฿100-150/kg (US$3-4.50) | Charged on top of the raw seafood you bring |
| Rock lobster | Market rate, much higher | Always confirm the per-kilo price first |
| Overcharge red flag | ฿1,000-1,600/kg (US$30-48) fish | Reported at tourist-trap Bangkok spots; walk away |
Ranges compiled from current market and operator listings as of July 2026 and vary by season, size and haggling. Confirm the per-kilo price at the point of sale. ฿33 = US$1 (July 2026).
The seafood market and cook-shop model
The best value and the freshest seafood in Thailand comes from the buy-it-raw, get-it-cooked model, and it is genuinely fun. You buy your seafood by the kilo from the fishmongers at a seafood market, then carry it across the road to one of the restaurants that cook it for a per-kilo fee and serve it with rice and Thai sides.
Phuket’s Rawai Seafood Market on the island’s south coast is the textbook example. The market vendors lay out prawns, squid, live crab, mantis shrimp, rock lobster and the morning’s fish from around 07:00, and the cook shops across the street run roughly 11:00 to 21:00. You choose and negotiate at the market, then hand your bag to a restaurant that charges a cooking fee of about ฿100-150 per kilo (US$3-4.50) to prepare it however you like: grilled with garlic, steamed with lime and chilli, or stir-fried in curry powder, as of July 2026. Confirm two numbers separately so nothing surprises you at the end: the per-kilo seafood price at the market stall, and the cooking fee (plus rice, drinks and sides) at the restaurant. Rawai, along with the island’s sit-down seafood restaurants, features in our wider Phuket food guide.
Because the market is where the haggling happens, it pays to know the etiquette: prices are per kilo, vendors quote tourists high, and a friendly counter-offer plus checking a couple of stalls is completely normal. Our bargaining in Thailand guide covers how to do it without friction.
What to order by coast and season
Order to the sea you are standing next to. Thailand has two coastlines and they land different things.
The Andaman coast (Phuket, Krabi, Trang, Koh Lanta) is known for tiger prawns, rock lobster, oysters, mussels and Andaman blue crab, with the local prawns often described as sweeter. The Gulf of Thailand coast (Surat Thani, Chonburi, Rayong, Hua Hin) is strong on oysters, Surat Thani in particular is known for large ones, and on blue swimming crab. Wherever you are, whole grilled fish, grilled squid and prawns done to order are reliable, high-value picks, and a bowl of tom yum goong made with the day’s fresh prawns is a classic way to see the coastal catch put to use.
Season matters two ways. First, monsoon timing differs between the coasts, and rough seas mean smaller, pricier landings, so ask what actually came in that morning rather than ordering off a laminated photo menu. Second, “fresh catch of the day” is not marketing here, it is the better order. Buying and eating early in the day, when the boats have just unloaded, gets you the best of it.
How to check seafood is fresh
You can judge freshness yourself in about ten seconds with your eyes, nose and a finger. For whole fish, look for clear, bright, slightly bulging eyes, not sunken or cloudy ones, and gills that are bright red or pink rather than brown, grey or slimy. Press the flesh: it should spring back, not hold your fingerprint. Prawns should have firm, intact shells with heads attached and no blackening around the head. Shellfish such as clams and mussels should be closed, or snap shut when tapped, and should smell clean and briny like the sea. A sharp fishy or ammonia smell means it is past its prime. When in doubt, buy where the turnover is high and the ice is fresh, and go early.
The famous seafood bill scandals
These are worth knowing as cautionary tales, because they show exactly what a sting looks like. Bangkok has a long-documented problem with restaurants whose names echo the genuinely well-regarded Somboon Seafood chain. Taxi and tuk-tuk drivers deliver tourists to the wrong, similarly named place for a commission, and the bills come in far above normal, with fish reported at around ฿1,600 per kilo (US$48) against roughly ฿400 per kilo (US$12) at reputable spots, according to widely reported diner accounts on review sites. Floating markets have generated their own viral overcharging stories, including a widely reported case of a single omelet billed at ฿400 (US$12).
The through-line: never let a driver choose your seafood restaurant. Many earn a cut of your bill, sometimes reported at around 30 percent, which is the whole incentive. Pick the place yourself, ideally one your accommodation or your own research points you to, and confirm prices before you order rather than after. This is the same driver-commission mechanism covered in our Thailand travel scams guide.
Is street seafood safe?
Generally yes, if you choose well. The safest street and market seafood is busy, cooked to order over fire or in a hot wok, and moving fast so nothing sits around going warm. Grilled squid, prawns and whole fish done in front of you are low risk and a highlight of Thailand’s street-food scene, which we cover more broadly in the Bangkok street food guide. Be more cautious with pre-cooked shellfish left sitting warm and unshaded, with anything that smells off, and with raw or lightly cured dishes such as goong chae nam pla (raw prawns in fish sauce) or raw blood cockles, especially if your stomach is sensitive or you are early in your trip. Stick to stalls with high turnover, cold seafood kept properly on ice, and cooking that happens after you order.
Where to next
Sort the rest of your eating: browse the Bangkok street food guide and the Phuket food guide for where to eat by city, and read bargaining in Thailand so you handle the fish market like a regular. Keep the Thailand travel scams guide in your back pocket for everything else. And when you want to know what is happening while you are here, check live Thailand events.
Sources
- Rawai Seafood Market operator and visitor guides on the buy-and-cook model, cooking fees and market hours (2025-2026).
- Diner accounts and reporting on Bangkok seafood bill overcharging and the Somboon Seafood name confusion (Tripadvisor reviews and forum threads).
- Khaosod English reporting on floating-market overcharging cases (2026).
- Seafood freshness sensory-check guidance from fisheries and seafood buyer guides.
- Regional seafood species guides for the Andaman Sea and Gulf of Thailand coasts.