South-East Asian fishing

THE CORAL TRIANGLE is the global centre of marine biodiversity — more coral and more reef fish species than anywhere else — spanning Indonesia, the Philippines, Malaysia, Papua New Guinea, Timor-Leste and the Solomons. Fringing reef, barrier reef and atoll, with deep water close inshore through much of the archipelago.

MANGROVE AND ESTUARY systems are the nursery for a very large share of the coastal fishery, and their loss is one of the region's most consequential environmental problems.

THE MEKONG is the world's largest inland fishery by catch. Its annual flood pulse is so large that it reverses the Tonle Sap in Cambodia, filling a great lake for months and creating the flooded habitat the fishery depends on.

PEAT SWAMP AND BLACKWATER systems in Borneo, Sumatra and the peninsula hold a distinct and specialised fish community.

AND THE IMPOUNDMENTS — enormous reservoirs built for power and irrigation — are where a good deal of the accessible sport fishing now happens.

REEF AND COAST: an extraordinary diversity — groupers, snappers, emperors, trevally, wrasse, parrotfish — plus sailfish, tuna, dogtooth tuna and Spanish mackerel offshore, and barramundi and mangrove jack in the estuaries.

FRESH WATER: giant snakehead and its relatives, hampala barb, jungle perch, mahseer in the northern hill rivers, and the great Mekong fishes — giant catfish, giant barb and freshwater stingrays among the largest freshwater fish on earth, several of them critically endangered.

THE SEASONALITY IN THE RIVERS IS THE FLOOD PULSE, not temperature. Rising water disperses fish into flooded forest and floodplain to feed and breed; falling water concentrates them into channels and lakes, which is when both the fishery and the fishing are at their most productive. The Tonle Sap reversal is the largest expression of this anywhere.

ON THE COAST the monsoon seasons set what is fishable and when, and they differ between coasts of the same country.

What a visitor will actually see is the artisanal fishery: nets, traps, weirs, handlines and small boats, worked by people for whom the catch is food and income. Lift-net platforms working at night under lights, stilted traps, cast nets, and long-line and gill-net operations from small craft.

THE SPORT FISHERY sits within that.

LURE AND FLY FISHING for giant snakehead in the peat swamps and reservoirs, which is the region's signature freshwater sport fishery and is usually guided.

MAHSEER FISHING in the northern hill rivers.

BARRAMUNDI in estuaries and impoundments.

OFFSHORE TROLLING AND POPPING for giant trevally, sailfish and tuna.

SQUID FISHING at night, both commercial and recreational.

REEF GLEANING at low tide, which feeds a great many households and is largely invisible in official statistics.

AND SPEARFISHING, which is traditional and modern here at once — and where improvised equipment and compressed-air use have produced a genuinely serious injury record that no visitor should imitate.

This region is where the honest account is hardest and most necessary.

FISHING HERE IS FOOD. Tens of millions of people depend directly on these fisheries for protein and income, and the inland fishery of the Mekong basin alone is among the most important food systems on the planet. Recreational angling is a small activity beside it, and a visitor who does not understand that will misread everything from the gear to the attitude to catch and release.

THE PRESSURES ARE SEVERE AND DOCUMENTED. Destructive practices — blast fishing and the use of poisons — are illegal almost everywhere and persist in places, driven by poverty rather than by malice. Mangrove clearance has removed nursery habitat at scale. Overfishing of reef species, particularly for the live fish trade, has depleted spawning aggregations.

AND THE MEKONG DAMS are the largest single question. Hydropower construction on the mainstream and tributaries alters the flood pulse, blocks migration routes for species that move hundreds of kilometres to spawn, and traps the sediment that builds the delta. The fishery that feeds the basin depends on that pulse continuing. This is an active, contested and consequential situation rather than a settled one, and several of the great Mekong fishes are critically endangered while it plays out.

TOMAN and HARUAN are giant snakehead and common snakehead in Malay usage — the headline freshwater sport fish, and air-breathers that survive in water no other predator tolerates.

BAGAN and LIFT NET name the platform fisheries working at night under lights, which are a characteristic sight across the archipelago.

KELONG names the stilted offshore platform, historically a trap and now often a fishing and leisure structure.

THE TONLE SAP REVERSAL names the annual backward flow that fills Cambodia's great lake and is the single most important event in the inland fishery.

AND FISH NAMES VARY BY LANGUAGE AND BY ISLAND to a degree that makes cross-checking essential. The region spans many languages, the same species carries several names, and the same name is applied to different species in different places — which matters when a protected species is involved.

Regulation is national and differs very widely across the region's countries, and enforcement capacity differs as much again.

IN SEVERAL COUNTRIES recreational fishing requires no licence in the sense a European reader expects, and access to specific waters is instead controlled by the owner, the community, the lodge or the reservoir authority. The absence of a licence requirement is not an absence of rules.

COMMUNITY AND CUSTOMARY ARRANGEMENTS over reef and inshore water are widespread, and permission from the people who hold that water is frequently the operative permission.

PROTECTED AREAS, MARINE PARKS AND LOCALLY MANAGED MARINE AREAS cover substantial areas with their own rules.

SPECIES PROTECTION applies to several high-profile fish, including some of the great Mekong species.

DESTRUCTIVE PRACTICES are prohibited almost everywhere, and a visitor who encounters them is looking at an offence rather than a local method.

THE MEKONG ITSELF involves several countries and a regional commission, which is a governance problem of a different order.

In practice, a visiting angler fishes through a licensed local operator, and that is both the practical and the responsible route. FishingHQ states no current rule.