Seafood
Brown seaweed
Brown seaweeds, mainly Sargassum, are collected rather than farmed in Indonesia and sold for alginate extraction and for agricultural biostimulants. Because it is a wild collection, season and location move the composition more than in any farmed seaweed.
How it leaves the country.
- Dried whole or chopped
- Sun dried after collection, baled or bagged. The bulk export form.
- Milled powder
- For extraction and for direct agricultural use, specified by mesh.
- Alginate
- Extracted and purified, sold on viscosity. Made by specialist processors rather than by a drying yard.
- Liquid extract
- Biostimulant products for agriculture, a growing use with its own registration questions.
How it is graded.
A wild-collected raw material, so cleanliness and moisture do most of the work and the alginate content is the commercial figure.
- Species
- Different Sargassum species and other brown seaweeds have different alginate content and character. It belongs in the specification.
- Alginate content
- The reason an extractor buys it, and it varies with species, season and collection site.
- Moisture
- Sun dried in a humid climate. High moisture means mould in the bale and freight paid on water.
- Sand and salt
- Collected from beaches and shallows. Both are weight you paid for and both interfere with extraction.
- Foreign seaweed
- Mixed collections happen. A specified species arriving mixed with others is a common complaint.
- Heavy metals
- Seaweed concentrates what is in the water. Testing matters for anything going to agricultural or food use.
How it is packed.
- Baled or bagged
- Compressed bales for freight economics, and over-compression on damp material causes heating.
- Volume
- Dried seaweed is bulky and light. A container fills long before it weighs out.
- Moisture and mould
- The main arrival failure. Dry storage before loading and a barrier where the route is long.
- Odour
- Strong. Do not consolidate with food or neutral cargo.
Where it grows.
East Nusa Tenggara
Lesser Sunda
Collection along the coasts, seasonal and weather dependent.
South Sulawesi
Sulawesi
Collection and drying with processing capacity and a route through Makassar.
Maluku
Maluku
Coastal collection, remote and with limited processing.
East Java
Java
Processing and extraction rather than collection.
Documentation, where applicable.
- Certificate of analysis
- Species, moisture, sand and salt content, alginate content and heavy metals on the shipped lot.
- Phytosanitary certificate
- Where the destination treats dried seaweed as a plant product requiring it.1
- Certificate of origin
- Which form applies depends on the destination and the preference scheme in force with Indonesia.
- Health certificate
- Where the material is destined for food use rather than industrial extraction.2
Questions buyers ask.
Is it farmed or collected?
Collected, in Indonesia, unlike the red seaweeds which are farmed on lines. That is why the season, the site and the weather move the supply and the composition.
Why does the alginate content vary?
Species, season and location all affect it, and a wild collection mixes them. Specify the species and test the lot rather than relying on a typical figure.
What is the most common problem?
Moisture and sand. Both are decided on the drying yard and both are what you pay freight on, so they belong in the specification with numbers.
Tell us what you need.
Give us the specification and the destination port. We come back with producer options and an indicative price. Our fee is 5 % of the order value, paid by you and never by the factory.
Sources
- 1Badan Karantina Indonesia, the national quarantine agency. Republic of Indonesia. Checked 3 August 2026.
- 2TRACES modules and features. European Commission, DG Health and Food Safety. Checked 3 August 2026.