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Equipment · Tanks and vats

Vietnamese fish-sauce wooden vat

Phú Quốc fish-sauce vat · thùng gỗ nước mắm Phú Quốc nhà thùng · Vietnamese nuoc mam vat

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A large upright stave-built vat used in documented Vietnamese fish-sauce production, with a weighted or covered top and a low outlet for drawing liquid; Phu Quoc examples belong to a living regional craft.

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Interpretive watercolor illustration of a large Vietnamese wooden fish-sauce vat with vertical staves, heavy bands and a low outlet on warm ivory paper.

Phú Quốc and a continuing fish-sauce craft

A wooden fish-sauce vat is a large, upright vessel used to mature salted fish and collect the liquid seasoning that develops. Phú Quốc, an island in southwestern Vietnam, is a particularly well-documented centre for this craft. Regional sources describe a living production tradition with dedicated barrel houses and several methods, including stirring, pressing, or combining the two. Vietnam News reports more than two centuries of fish-sauce making on the island and its recognition as national intangible cultural heritage in 2021. Those statements concern the regional craft; they do not date every vat or prove that every Vietnamese fish sauce uses the same vessel.

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Staves, bands and scale

The vessel is assembled as a tall wooden cylinder from upright staves held together by heavy circumferential bands. In Phú Quốc producer photographs, vats stand in dense rows inside a high barrel house, often taller than a worker. These are fixed workspaces for moving salted fish, accessing the top, monitoring batches and drawing liquid; the vat itself remains equipment, while a purpose-built barrel house is a separate structure. The available sources do not establish one wood species, hoop material, taper, or cover design for all makers, so those features should be read from a specific producer's vat rather than made into a universal model.

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Maturation and extraction

Fish and salt are loaded into the vessel, and a cover or weight can hold the mass below its brine. The National Resources Institute manual describes fish sauce vats made of wood or cement and gives a broad maturation range of five to eighteen months for the classic sauces discussed there. Its Vietnamese figures show both the vat arrangement and a low outlet. After maturation, clear liquid can be skimmed or drained through a spigot near the bottom, then filtered and bottled. The manual's general timing is not a Phú Quốc recipe or a safety validation.

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Producer examples and regional variation

The scale of an individual vat is substantial but producer-specific. Red Boat says its barrel holds 13 tonnes of black anchovies and describes a 12-month fermentation before first-press sauce is bottled. A Phú Quốc Tourism account describes wooden barrels reaching four metres high and holding 12–13 tonnes of anchovies and salt, while a local producer Phụng Hưng describes wooden vats holding 10–12 tonnes and a 10–12-month fermentation. These figures come from distinct sources and should not be collapsed into one standard specification. Across the wider craft, producers use stirring, pressing, or a combination, so the vat's fittings and loading practices reflect the method and maker.

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What the vessel explains

The vat supplies a container and drainage path for prolonged contact between salted fish and the liquid that forms as fish proteins break down. It does not itself determine the salt ratio, the species of fish, the maturation schedule, or the final grade. The NRI manual also describes cement vats, which belong outside this wooden-vat entry. Likewise, a coopered wine barrel may share staves and hoops but serves different processes and scales. The meaningful comparison is material and form, not an assumption that all wooden vessels work alike. No pressure rating is documented for these vats; their covered tops should not be read as pressure-vessel closures.

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History

Vietnam News reports more than two centuries of Phu Quoc fish-sauce craft and 2021 national intangible-cultural-heritage recognition. The sources do not establish the first date or an unchanged history of this exact vat construction.

Equipment details

CapacityNo universal volume range is established. Red Boat reports one barrel holding 13 tonnes of anchovies; Phung Hung describes 10–12-tonne wooden vats. These are producer-specific fish-load figures, not volume measurements or a type-wide capacity.
SizeNo common dimensions are established. The cited Phu Quoc tourism account describes some modern production barrels up to four metres tall; this is a reported local example, not a universal size.
PowerNo power The vat is passive; settling, salt-driven maturation and liquid extraction are not powered by the vessel.
How you get oneBought, manufactured A coopered wooden vessel made by a specialist; the cited sources do not provide a standard supplier or transferable purchase specification.
CareThe sources do not specify one cleaning or maintenance schedule for all vats. Follow the producer's instructions for the vat, its wood and its outlet fittings; the process manual describes vessels used for fish-and-salt maturation, not a universal cleaning protocol.

Made of

  • Wood — Vessel body
    The cited Phu Quoc producers document wooden vats; the fish-handling manual notes that other fish-sauce vats may be wood or cement. Wood species and construction vary by maker.
  • Hoop bands — Stave restraint
    Circumferential bands are visible in the inspected Phu Quoc vat photograph; the source does not establish one material for bands across all vats.
Risks and precautions · Standard risk
Assuming pressure rating

The sources describe vats for maturation and liquid extraction but give no pressure rating; do not infer that a covered vat is pressure-vessel equipment.

Hazard source

Use the vat only in the producer's documented process and configuration; the cited sources describe drainage or extraction, not pressurized operation.

Control source

Limits

Capacity, wood species, band materials and process duration vary by producer; the Red Boat 13-tonne and 12-month example must not be treated as a universal Phu Quoc specification.

Source →

A technical manual also describes cement vats for fish sauce, but this record is limited to wooden vessels.

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Places

Phú Quốc Island

Traditional use · Region evidence

A documented regional centre for fish-sauce production in wooden vats; this does not claim all Vietnamese fish sauce is made here or that the vat originated here.

More equipment from Phú Quốc IslandLocation source 1 → · Location source 2 → · Location source 3 → · Location source 4 →

Related

Variants

  • Coopered barrel, cask and large wooden vat

    Coopered vessels use shaped staves and hoops, but portable barrels, large foeders and upright wooden vats serve different roles. Materials and uses vary by place and process.

Used for

  • Fish sauce

    Fish sauce is a clear, salty seasoning made by maturing fish with salt and drawing off the liquid. The broad family includes distinct regional sauces rather than one interchangeable method.

Read more

More from Vietnam

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    A bamboo internode can serve as the cooking vessel itself: its natural node closes one end while the open end holds food, often with a leaf lining or plug. Regional preparations differ in filling, fire arrangement and handling.

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