The earliest written Thai laws regulated fishing. The Mangrai Code of the Lanna Kingdom in the thirteenth century specified penalties for fishing in royal waters, and the Ayutthaya-period Kotmai Tra Sam Duang (Three Seals Law) of 1805 — though compiled then, it drew on much older material — contains multiple provisions governing nets, traps, and fish weirs. Fishing was not a marginal activity in pre-modern Thai life. It was central enough to require legal architecture.
The methods those laws regulated are still here, if you know where to look. Modified by a century of manufactured materials, reduced in geographic range by the shrinkage of wild fish populations, retreating in some areas to festival culture and museum display, they persist. In rural Isaan, the smell of a dap kabok — bamboo split and dried and woven — still means the same thing it meant four hundred years ago.
The Dap Kabok: Bamboo Cone Trap
The dap kabok (ดักโก บ) is the defining trap of the northeast. Its form is simple — a cone of woven bamboo strips, narrow at one end, wide at the other, with an internal funnel that allows fish to enter easily but prevents their exit. It is set in flowing water, weighted with stones or staked into the riverbed, oriented so that the current brings fish through the open end and into the trap. Overnight, the fish mill inside it. At dawn, the trapper wades out, retrieves the trap, and empties it into a basket.
The construction requires skill. The bamboo must be split to uniform width, dried to a specific degree — too dry and it cracks, too green and it swells shut in the water — and woven with a tightness that prevents escape of small fish but does not impede water flow to the point of deterring entry. A good dap kabok maker in Nakhon Ratchasima or Ubon Ratchathani can produce a working trap in a morning from bamboo sourced the day before. The knowledge is traditionally passed from parent to child, and the age at which children in rural northeastern households learned the weave — sometimes as young as eight or nine — reflects how fundamental the skill was to household food production.
The species most associated with dap kabok in Isaan are snakehead (Channa striata, pla chon), walking catfish (Clarias batrachus, pla duk), and various small cyprinids. The flooded paddies of the northeast's wet season create ideal trapping conditions: shallow, slow-moving water with high fish concentrations, fish moving between field and channel to feed, predictable nocturnal patterns. The trap does not require the trapper's presence during the catching — it works while he sleeps.
The dap kabok's near-relative, the lob (โลบ), is a cylindrical rather than conical trap, used in deeper water, often baited with rice husks or fermented material to attract fish actively rather than relying purely on current and migration patterns.
The Haek: Cast Net
The haek (แห) — cast net — is the most geographically widespread traditional method in Thailand, found in virtually every province and ecosystem. Its principle is ancient and elegant: a circular net with a weighted perimeter is thrown by a skilled practitioner to open into a disc in the air and sink around a school of fish; the weights carry the edges down, trapping fish beneath; the net is then hauled in by a central line, bunching the edges together and retaining the catch.
Throwing a haek well is a skill that takes months to develop and years to refine. The technique involves a specific sequence of grip positions on the net, a rotation of the body, and a release that requires the net to spin open symmetrically in the air. A poorly thrown haek either fails to open, opening asymmetrically and sinking unevenly, or tangles on itself. A well-thrown haek opens to its full diameter — which might be four to seven metres — and lands flat on the water before sinking.
In the Chao Phraya delta, where the river system spreads into a maze of canals, backwaters, and tidal channels south of Bangkok, haek fishermen work from long-tail boats, reading the water for surface signs of fish schools — ripples, nervous baitfish, bird activity — before positioning and casting. The delta haek tradition has been documented extensively by ethnographers because it survived into the living memory of people still practising it today. In Samut Prakan and Samut Sakhon provinces, family operations running on the same principles as their great-grandparents used are still visible in the early mornings.
A well-thrown haek opens to its full diameter — sometimes seven metres — and lands flat on the water before sinking. Watching a skilled practitioner work is closer to watching a performance than a practical operation.
In the south, haek fishing takes on different characteristics, influenced by the Malay fishing tradition that dominates the Gulf and Andaman coasts. Southern cast nets tend to be lighter and with finer mesh, suited to the mullet, anchovy, and small reef species of shallower coastal environments. The throwing technique in some southern communities — particularly in Satun and Narathiwat provinces — shows Malay influences in the grip and release sequence that differ noticeably from the central Thai style.
The Saen: Drag Net
The saen (แสน) is a seine net — a long, rectangular net deployed by two operators, typically from boats or from opposite banks, that is dragged through the water to encircle fish. The term covers a range of net types from simple village drag-nets used in ponds to more sophisticated seine operations on larger rivers and reservoirs.
The community dimension of saen fishing distinguishes it from individual trap and cast-net methods. A saen operation requires coordination — typically a minimum of four to six people, often more — and the catch is traditionally shared among participants. In northern Thailand's river communities, seasonal saen operations on the Nan and Wang Rivers were communal events in the wet season, when high water drove fish into accessible areas. The catch fed not just the fishing families but the wider village.
The practice has declined sharply with fish population decreases. A saen operation in the Nan River today will produce a fraction of the catch that a similar effort would have generated in the 1970s, and many communities have abandoned the method as economically marginal. The Department of Fisheries has, at various points, restricted seine-net dimensions and mesh sizes to protect juvenile fish, and some seasonal restrictions apply in key waterways.
The Liang: Long-Line
Liang (เลียง), in its simplest sense, refers to long-line fishing — a mainline to which multiple shorter lines with baited hooks are attached at intervals. The method is among the oldest in the world, and its Thai form varies considerably by region, target species, and water type.
In the deep channels of the Mekong, northern long-line operators target giant catfish using lines that might run to several hundred metres with dozens of hooks, baited with cut fish or fermented paste, and staked overnight. The Mekong giant catfish (Pangasianodon gigas, pla buek) was traditionally caught this way in large numbers — Thai fisheries records from the 1970s and 1980s describe seasonal harvests of dozens of fish at specific deep pools near Chiang Khong and Chiang Saen. Those harvests no longer occur; the species' wild population has collapsed, and it is now protected. But the liang technique survives, applied to other large catfish species.
In the south, coastal long-lines targeting grouper, snapper, and sea bass are still commercially operated from small wooden boats out of Muslim fishing communities in Pattani, Yala, and Narathiwat. These operations use modern monofilament and manufactured hooks, but the underlying method — stake, bait, wait, retrieve — is functionally identical to what their ancestors practised with rattan lines and bone hooks.
The Fishing Weir: Ramphan and Kai
The ramphan (รำพัน) is a brush-wood and bamboo fish weir — a partial barrier constructed across a channel or river margin that deflects or concentrates fish without permanently blocking their passage. Unlike a dam, it is permeable and temporary, constructed seasonally and removed after the fishing period. Weirs of this type are found across Southeast Asia and represent one of the oldest fish-capture technologies on record.
The Thai fishing weir tradition encompasses several regional variants. In the northeast, the kai (ไซ) is a system of woven bamboo panels arranged in a V-shape pointing upstream, with a funnel and trap at the apex. Fish moving downstream, particularly during the falling-water phase of the wet season when they are migrating from flooded fields back to permanent water, are channelled into the apex and into traps. The kai was among the most productive traditional fishing technologies in Isaan, capable of capturing large quantities of fish during the relatively brief migration windows of October and November.
Festival Culture and Living Knowledge
The survival of these methods in 2026 takes different forms in different contexts. In some communities — remote Isaan villages, Karen settlements in northern river valleys — traditional methods remain genuinely practical, deployed for food as well as cultural continuity. In many more places, the methods survive primarily in festival contexts: the annual festivals at Bung Khong Long in Bueng Kan province, the Pa Sak river festivals in Saraburi, and various bun lom harvest celebrations that include traditional fishing demonstrations.
The festival survival is not meaningless. It preserves embodied knowledge — the muscle memory of the net throw, the weaving pattern of the bamboo trap, the reading of water that tells a saen operator where to set — that would otherwise be lost entirely. Thailand's Department of Cultural Promotion has documented several of these methods as elements of intangible cultural heritage, placing them in the same category as classical dance and traditional music.
What is being protected, beyond the techniques themselves, is a way of knowing rivers and lakes that pre-dates sonar and satellite imaging by centuries. The old trapper reading the water at dawn — watching for the signs that tell him where fish have concentrated overnight, placing his trap not by habit but by inference — carries in his head a model of aquatic behaviour that no modern technology has fully replicated. That knowledge is attached to specific rivers, specific seasons, specific species, specific landscape configurations. It disappears not gradually but suddenly, when the last practitioner dies and no one has learned the weave.
The graphite rod and the braided line are better tools for many purposes. They are not better repositories of knowledge about what the river was, and what it still might become.
