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Lanhouin

lan huin

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Lanhouin is a strongly flavoured fermented fish condiment documented in coastal West Africa, including southern Benin. This page records one published research reproduction as evidence, not as a validated home-preservation recipe.

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Illustrative still life of dry salted-fermented fish condiment; not a photograph of the research batch or a safety recommendation.

A fish condiment from coastal West Africa

Lanhouin is a strongly flavoured fish condiment associated with the Gulf of Benin and coastal West Africa. A survey in Mono District, southern Benin, documented processors, markets and household use. Respondents described several processing variants; the researchers reported use as a flavouring for vegetable, slimy-vegetable and tomato sauces. This evidence supports a documented Benin association, not a single birthplace or one uniform regional method.

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One research reproduction, not a household formula

A 2007 microbiology paper studied naturally fermented cassava fish identified at genus level as Pseudotolithus sp. Its modified traditional reproduction used about 2 kg fish, scaled and gutted, with an average individual fresh weight of 250.0 ± 6.5 g. The researchers ripened it for eight hours, applied salt at 30% of fish weight, wrapped the fish in cloth, placed it in a basket and fermented it for three to eight days at reported ambient temperatures of 28–30°C. These figures describe the experiment. They do not establish a safe household batch, a final salt concentration or a validated endpoint.

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Fish names and variants

The 2007 study identifies its raw material only as Pseudotolithus sp.; it does not name a species. Other Lanhouin field research reports a wider range of fish and process variants, and Spanish mackerel is a separate fish from cassava croaker. The recipe record should therefore keep the 2007 batch tied to its own genus-level identification rather than silently treating all regional fish as interchangeable.

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Safety limits remain unestablished

Fermented, salted or dried fish can carry a botulism hazard when fish is uneviscerated or partly eviscerated; FDA guidance highlights this risk for preserved fish. The research procedure does not supply a validated household control. Histamine is another concern for susceptible species after poor time and temperature control; once formed, it is not destroyed by cooking, freezing or curing. The Lanhouin literature reviewed here does not establish a species-specific histamine control for every fish used. Fish is a major allergen. No smell, taste, appearance, elapsed time or single household measurement can demonstrate that this experimental product is safe.

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History

Published work documents Lanhouin production research in Benin by 2007 and a survey of processors and consumers in Mono District in southern Benin by 2012. Neither source establishes when the practice began.

Ingredients

Scaling: source batch only

Cassava fish (Pseudotolithus sp.)Scaled, gutted and washed; mean fresh individual weight in the experiment was 250.0 ± 6.5 g.
2 kg
Approximately 2 kg total in the 2007 experiment; fish is identified only as Pseudotolithus sp.
Salt
0.6 kg
30% w/w of fish weight in the experimental batch; this is the study's input ratio, not a validated safety limit.

Method

Risks and precautions · High risk

High-risk research record only. It is not a validated or safe home-preservation recipe; do not follow the warm-fermentation steps to preserve fish.

The study identifies the fish only as Pseudotolithus sp. and does not establish a species-specific safety process.

The paper's 30% salt input and 28–30°C, 3–8-day observations are experimental conditions, not validated safety limits or storage instructions.

Fish is a major food allergen.

  1. The 2007 study's experimental procedure used about 2 kg of cassava fish identified as Pseudotolithus sp.; it scaled, gutted and washed the fish. Mean fresh individual weight was 250.0 ± 6.5 g.
  2. The researchers let the fish ripen for 8 hours, then treated it with salt at 30% by fish weight.
  3. They wrapped the fish in cloth, arranged it in a basket and allowed spontaneous fermentation for 3 to 8 days at ambient temperatures reported as 28–30°C.
  4. This is a record of a controlled research reproduction, not a safe home recipe. Do not use these steps to preserve or eat fish: the study does not establish a household safety control, validated endpoint, storage life or safe process.

Conditions

Fermentation3–8 days
Temperature28–30°C
Temperature controlAmbient, monitored

Places

Benin

Documented preparation · Country evidence

The fermentation paper's author affiliations and research context are in Benin; the survey explicitly sampled Mono District in southern Benin. This does not establish a birthplace or single origin.

See Beninon the mapLocation source 1 → · Location source 2 →

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