Kung Krabaen Bay Aquarium

Kung Krabaen Bay Aquarium — officially the Sixth Cycle Birthday Anniversary Celebration Aquarium — sits inside the Kung Krabaen Bay Royal Development Study Centre in Tha Mai district, Chanthaburi. It’s run by the Department of Fisheries, and like the rest of the study centre, entry is free; a donation box near the entrance covers running costs if you’d like to contribute.

The name marks King Bhumibol Adulyadej’s 72nd birthday — his sixth 12-year cycle on the Thai calendar — which is when the aquarium was established. That royal-anniversary framing is also why it exists here in the first place: the wider study centre was founded under the King’s development initiatives for coastal Chanthaburi, focused on restoring degraded shrimp-farming land and mangrove forest. The aquarium is essentially the public-facing wing of that larger research and demonstration project.

Thirty-six tanks are arranged around those four themes. It’s a modest facility by design — a fisheries-department education centre rather than a large commercial aquarium — so go in expecting a focused hour, not a half-day marine park.

Insider Tip: Don’t treat the aquarium as a standalone stop — it’s one building inside a much larger royal development project that also includes mangrove boardwalks and shrimp-farming demonstration ponds. Budget half a day for the wider Kung Krabaen Bay Royal Development Study Centre and treat the aquarium as one part of that visit.

Watch out: Tanks and signage show their age in places — this is a working education facility rather than a recently built attraction, so temper expectations if you’re coming from a big-city aquarium.

Weekday mornings are quietest, before school groups and family visits pick up in the afternoon. There’s no separate parking charge, and the study centre’s other sections — including the shrimp ponds and mangrove walkway — are within easy walking distance if you want to extend the stop. Combine it with the coastline nearby at Laem Sadet for a coastal half-day out of Chanthaburi town.

The building itself is simple — a single-storey hall with the tanks set into the walls rather than a themed walkthrough experience — so photography is straightforward but there’s no dramatic tunnel or oceanarium-style centrepiece to expect. That’s consistent with its origin as a fisheries research and education facility rather than a tourism development: the emphasis is on identifying and explaining local species rather than staging a spectacle. Staff on site can usually answer questions about the species on show, particularly during quieter weekday mornings when there’s no queue at the tanks.