Spearfishing occupies an interesting position in Thailand's fishing culture. It is practised, it is legal outside the country's extensive marine protected areas, and the Andaman coast in particular offers reef and pelagic diving that can genuinely impress experienced divers from anywhere in the world. But the infrastructure around it is sparse, the legal framework requires careful navigation, and anyone approaching this activity without honest preparation will encounter frustration before they encounter fish.
This guide is intended to give a clear picture of the scene as it actually exists — not as it appears in promotional social media posts.
The Andaman's Underwater Terrain
The Andaman Sea gives Thailand its most spectacular underwater terrain. The reef systems that run from the Myanmar border in the north down through the Surin and Similan island chains, then south past Phang Nga Bay and into the Krabi and Koh Lanta area, include walls, bommies, and channel edges that support substantial fish populations. Visibility in the dry season months — roughly November to April — routinely exceeds 20 metres, and often pushes to 30 or more around the offshore pinnacles.
The difficulty, and it is a significant one for spearfishers, is that the best sites are almost entirely inside marine national parks. The Similans, the Surins, Koh Bon, Koh Tachai, Richelieu Rock — all of the marquee locations that give the Andaman its international reputation for underwater beauty are fully protected. No fishing of any kind, including spearfishing, is permitted inside these boundaries.
The Similan Islands National Park, the Surin Islands Marine National Park, and Mu Koh Lanta National Park are absolute no-take zones. Spearfishing here carries real penalties — including fines, equipment seizure, and possible detention. The park authority patrols these waters and takes violations seriously.
This is worth stating plainly: if you see images of spearfishing on Thai reef walls that look like the Similans, those images likely depict illegal activity, whether the person posting them recognises that or not.
Where Legal Spearfishing Is Possible
That said, Thailand's Andaman coastline is extensive, and a meaningful amount of accessible reef and blue water sits outside declared park boundaries.
Phang Nga Bay Outer Edges
The inner bay area around Phang Nga is a UNESCO-listed biosphere and effectively off limits for any disruptive activity. But the outer edges of the bay, and the reef systems extending south and east toward Koh Yao Noi and Koh Yao Yai, include areas outside the strictest protection zones. Some of these reefs hold good populations of grouper and snapper. Local knowledge is essential here — the boundaries are not always clearly marked on the water, and a guide who knows the area is not optional.
Koh Racha and the Southern Phuket Reefs
Koh Racha Yai and Koh Racha Noi, south of Phuket, are popular dive sites but are not inside a declared national park. The reefs around these islands — and the deeper water between them and the mainland — see some spearfishing activity. Fish pressure from years of recreational and commercial fishing means the reefs are not pristine, but they are workable. See our Racha Yai and Racha Noi guide for general site information.
Blue Water Around Phuket's Western Headlands
For pelagic spearfishing — targeting tuna and mackerel in open water rather than reef fish — the drop-offs and current lines off Phuket's western headlands and the southern tip of the island can produce opportunities during the dry season. Longtail tuna and Spanish mackerel move through these areas, and a breath-hold diver with good technique can intercept them on the edges of bait balls. This style of hunting demands significant freediving experience and should not be attempted without a competent safety diver in the water.
Equipment: Pneumatic vs Band Guns
The two main categories of speargun relevant to Thailand's conditions are band-powered spearguns and pneumatic spearguns. Each has a distinct character.
Band-powered spearguns — the conventional rubber-band style familiar from European and global freedivers — are mechanically simple, easily maintained, and produce no compressed gas complications with airlines. Shaft diameters typically range from 6.5 to 8 mm for reef work, with length choices of 75 to 110 cm covering most situations in Thai waters. A 90 cm band gun is a reasonable all-purpose choice for reef hunting in moderate visibility. Reloading requires physical effort and requires you to be on the surface, but this is not the disadvantage it might seem — it is part of the rhythm of safe breath-hold hunting.
Pneumatic spearguns use compressed air in the barrel to drive the shaft. They are mechanically more powerful for a given barrel length and favoured by some divers for deep-water pelagic work, but they require access to a high-pressure pump or compressor for charging, and their maintenance demands are higher. In Thailand's generally warm water and relatively accessible depth ranges, the average spearfisher gains little from pneumatic power that a well-chosen band gun cannot match.
For reef hunting in Thai waters, a mid-length band gun in the 90–100 cm range, paired with a good reel or breakaway rig for snapper and grouper work, is the practical choice.
The sites that made the Andaman famous for diving are protected for good reason. The most productive legal spearfishing happens in places few people photograph.
Finding Operators
This section requires honest management of expectations. Dedicated spearfishing operators — the kind that provide guiding, safety diver cover, boat support, and knowledgeable site selection — are genuinely rare in Thailand. The dive industry here is built around scuba, and many dive operators have limited interest in or knowledge of spearfishing.
A small number of freediving schools on Koh Tao and around Phuket will facilitate spearfishing sessions as an add-on to freediving instruction or for already-certified divers. Koh Tao, as Thailand's freediving hub, is the best starting point for making enquiries. Ask specifically for instructors who actively freedive for fish themselves — their guidance on local sites, species, and legal boundaries will be more reliable than someone who has simply agreed to supervise a paying guest.
For broader charter and boat-hire context in the Andaman, the Khao Lak charter operators overview includes operators who run multi-purpose marine trips and may be willing to facilitate spearfishing outside park limits.
Safety: The Non-Negotiable Parts
Shallow water blackout — loss of consciousness caused by hypoxia during ascent — is the dominant cause of spearfisher fatalities worldwide. It is silent, rapid, and entirely preventable with one straightforward rule: never dive alone. A safety diver watching from the surface, ready to recover an unconscious diver, is not optional protocol — it is the minimum standard for anyone serious about this sport.
Beyond the buddy rule:
- Do not hyperventilate before dives. The practice feels like it prepares you; it actually masks the hypoxic signals that would naturally warn you to surface.
- Respect your personal turn-around depth and time. Thai reef walls can be visually compelling in ways that encourage pushing limits.
- Wear a weight belt appropriate to your wetsuit, not so much that you cannot float passively on the surface after a hard dive.
- A 3 mm wetsuit is comfortable in Thailand's 28–30°C surface water and provides adequate thermal protection for repeated dives to typical reef depths.
A recognised freediving course — AIDA 2 is the practical minimum for reef spearfishing — provides the physiological understanding and supervised experience that make all of this intuitive rather than mechanical.
Conservation Context
Spearfishing, when practised with selectivity and restraint outside protected areas, has a lighter footprint than hook-and-line methods that involve bycatch or deep-hook mortality in released fish. A diver can choose exactly what they shoot and what they leave. That selectivity is also part of what the ethical spearfishing community values about the practice.
In Thailand's context, where reef fish populations face chronic pressure from commercial trawling, blast fishing (historically, though declining), and over-collection for the live fish trade, recreational spearfishers who take modestly and target abundant species are a small part of a large picture. The critical contribution recreational divers can make is in supporting the expansion and enforcement of marine protected areas, not undermining them for access.
For detailed guidance on what is and is not permitted across Thailand's marine parks, the marine national parks fishing rules page is the essential reference.
The Andaman is genuinely beautiful. Its reefs deserve the protection they have. The spearfishing that is possible here, in the legal margins around those protected spaces, is worth pursuing carefully and honestly.
