Thailand is, by any sober reckoning, one of the most extraordinary fisheries on the planet. Few countries pack so many genuinely outsized species into so small a landmass, and almost none combine the freshwater giants — the catfish, the carp, the snakehead, the introduced Amazonian monsters — with serious saltwater game on two coasts. The result is a fishery where, in a single short trip, you can bend a rod against a 100-kilo Mekong catfish in a Bangkok pay-lake on Tuesday and be casting poppers at giant trevally in the Andaman Sea by Friday.
This is the field guide to the species that make that worth doing.
What you'll find here
The species pages on this site are written like the entries in a serious field guide — biology first, then where to find them in Thailand, then how to actually hook one. Each entry covers identification, behaviour and diet, the venues where the fish is reliably caught, the months that fish best, the techniques that work, the tackle classes you should bring, the relevant records, and the conservation context. We close every entry with a candid note on what it's like to be attached to one of these animals, because the romance of the sport is real and worth taking seriously.
We have organised the guide around what an angler is most likely to ask first: what can I catch in Thailand, where, and when? That means the lineup leans toward the species you can realistically target on a recreational trip — not every fish that swims in Thai waters, but the ones worth crossing time zones for.
The freshwater giants
Thailand's freshwater fishery is famous for its giants, and most of them live behind chain-link fences in private pay-lakes. Some — the Mekong catfish and the Siamese carp — are native species that have become almost impossible to catch in the wild but that pay-lake operators stock and grow to extraordinary sizes. Others — the arapaima, the Amazon redtail catfish, the pacu, the alligator gar — were introduced from South America and the southern United States and have thrived in the warm, fertile conditions. A handful — the Chao Phraya catfish, the giant freshwater stingray — can still be hunted in genuinely wild water, mostly the lower stretches of the Mae Klong and the Chao Phraya itself.
The lure-and-fly fishery sits beside the bait-fishing scene. The giant snakehead is the country's premier topwater predator, the barramundi and peacock bass are the lure angler's bread and butter, and the mahseer — found in jungle rivers in the country's far south and west — is one of Asia's great fly-rod targets. The giant gourami is for masochists who like sight-fishing technical surface eaters with a fly rod and a lot of patience.
The saltwater fishery
On the Andaman side, Thailand offers a mature, accessible billfish, GT, and pelagic scene out of Phuket, Khao Lak and Phang Nga. Sailfish — the Indo-Pacific sailfish, specifically — are the headline species, with a season that runs from late autumn through early spring. Marlin are caught but rare. The popping and jigging fishery for giant trevally and other reef predators is the main draw for many anglers, especially around the Similan and Surin islands and the limestone stacks of Phang Nga Bay.
The Gulf of Thailand fishery, on the eastern coast, is less famous but quietly productive — the species mix is broadly similar but the boats are smaller and the trips shorter. We'll cover both sides in the saltwater section, but the species here apply equally to either.
Conservation
Several of the fish covered on this site are vulnerable in their native ranges. The Mekong catfish is critically endangered in the wild. The Siamese carp is endangered. The Chao Phraya catfish is endangered. The mahseer is listed as endangered or near-threatened depending on the species. The giant freshwater stingray is endangered. We cover them all because they can be caught legally and ethically in stocked or carefully-managed venues, and because well-run pay-lakes in Thailand actually contribute to brood-stock conservation rather than the reverse. Where wild-water fishing is on the table, we are explicit about catch-and-release norms and about the legal status of the fish.
The introduced species are, in turn, ethically uncomplicated to fish for. They are not native to Thailand, they are confined to managed waters, and the operators who stock them generally have a long-term commercial interest in maintaining the population.
How to use this guide
If you know what you want to catch, head straight to the species page. If you don't, browse the parks directory to see what each venue stocks, then come back to research the headline species. If you're planning by region rather than by species, start with the locations hub.
And if any of this is your first time on the water in Thailand, the practical guides section covers the boring-but-essential stuff: licences, packing lists, getting from a Bangkok hotel to Bungsamran, what to pack for a tropical liveaboard, and what to do when the southwest monsoon settles in for a week.