Factsheets for Brown Seaweeds (phylum Phaeophyta)

Genus: Nemacystus Trade names: nemacystus Symbol: NM
AuthorityDerbès & Solier Type species: Nemacystus flexuosus (C. Agardh) Kylin
Commercial species:  decipiens (DEC)
Common names: Itomozuku, Mozuka, Mozuku
Classification: Eukaryota, Phylum Heterokontophyta, Order Ectocarpales, Family Chordariaceae.
AlgaeBase names and species:  12 names - 7 current as of 12-2001.
Comprehensive lists of common names , generic & specific names can be found at AlgaeBase. >>Click here<<  for SuriaLink's policy on names.
SuriaLink SeaPlant Utility Rating
Useful food & fucoidan source - can be farmed - expansion potential.
Agronomy & harvesting must use good  environmental practices.
Medium -dark brown thallus with a stringy fronds. Fronds not turgid. Can exceed 50 cm. in length. Easily confused with Cladosiphon which is also called "mozuku".
Attaches to hard substrate such as rocks and corals. Can be cultivated in the sea on nets or in raceways on land.

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Nemacystus production
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Tons per annum
wild harvest
Tons per annum
Japan 1,500? (may be confused with Cladosiphon) 500?


1,500? 500?
Approximate annual production figures from recent years are as above. Note that both Cladosiphon and Nemacystus are known as "mozuku" in Japan, Okinawa, Pacific Oceania and elsewhere so it is difficult to distinguish harvest volumes based on genus.
Biology & Agronomy
Grown on nets and/or in raceways in Japan, Okinawa.
Source of alginates and fucoidan.
We have several monographs in progress covering analytical procedures post-harvest treatment and process technology. Check the processing index for available web pages and monographs. 
Products, Uses & Applications
Nemacystus has established use as a sea vegetable and, along with
Cladosiphon, is widely known commercially as "mozuku". These genera are also a source of the group of bioactive sulphated polysaccharides known as "fucoidan". Fucoidan is receiving attention in medical research circles because it appears to have anti-viral, anti-inflammatory and anti-coagulant properties. Nemacystus is also a source of alginates but does not seem to be extensively used as a commercial source of these biopolymers.
List of species' uses and community affiliations
Genus GenID SpID Species Uses Communities
Nemacystus NM DEC decipiens FA, FI, FF, IA, PA, MD AI, BP, NP, SV, WB

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Nemacystus is most strongly associated with the Agro-Industry,  Biopolymer, NutriPharm, Seavegetables and Wellbeing communities.
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