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Kappaphycus alvarezii Elkhorn sea moss, Marine Red Seaweed

Kappaphycus alvarezii is commonly referred to as Elkhorn sea moss, Marine Red Seaweed. Difficulty in the aquarium: Not suitable for aquarium keeping. Toxicity: Toxic hazard unknown.


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lexID:
18166 
AphiaID:
371403 
Scientific:
Kappaphycus alvarezii 
German:
Rotalge, Makroalge 
English:
Elkhorn Sea Moss, Marine Red Seaweed 
Category:
Red algae 
Family tree:
Plantae (Kingdom) > Rhodophyta (Phylum) > Florideophyceae (Class) > Gigartinales (Order) > Solieriaceae (Family) > Kappaphycus (Genus) > alvarezii (Species) 
Initial determination:
(Doty) Doty ex P.C.Silva, 1996 
Occurrence:
Bangladesh, China, Christmas Islands, Costa Rica, Cuba, East Africa, Fiji, French Polynesia, Guam, Hawaii, Indian Ocean, Indonesia, Kenya, Kiribati, Malaysia, Micronesia, Oceania, Philippines, South China Sea, Sulawesi, Tahiti, Tansania, the Caribbean, the Society Islands, Tonga, Vietnam, West-Atlantic Ocean, Western Indian Ocean 
Marine Zone:
Subtidal, sublittoral, infralittoral, deep zone of the oceans from the lower limit of the intertidal zone (intertidal) to the shelf edge at about 200 m water depth. neritic. 
Sea depth:
0,2 - 17 Meter 
Habitats:
Aquaculture 
Size:
up to 78.74" (200 cm) 
Temperature:
24,7 °F - 29,3 °F (24,7°C - 29,3°C) 
Food:
Dissolved inorganic substances) f.e.NaCL,CA, Mag, K, I.P, CO2, Dissolved organic substances, Introduced species, Photosynthesis 
Difficulty:
Not suitable for aquarium keeping 
Offspring:
Possible to breed 
Toxicity:
Toxic hazard unknown 
CITES:
Not evaluated 
Red List:
Not evaluated (NE) 
More related species
in this lexicon:
 
Author:
Publisher:
Meerwasser-Lexikon.de
Created:
Last edit:
2026-02-18 10:20:25 

Captive breeding / propagation

The offspring of Kappaphycus alvarezii are possible. Unfortunately, the number of offspring is not large enough to cover the demand of the trade. If you are interested in Kappaphycus alvarezii, please ask your dealer for offspring. If you already own Kappaphycus alvarezii, try breeding yourself. This will help to improve the availability of offspring in the trade and to conserve natural stocks.

Info

Like terrestrial plants, seaweed also undergoes photosynthesis and is considered an important source of oxygen.
Kappaphycus alvarezii is now the fifth most cultivated macroalgae worldwide, as it is an important source of carrageenan, which is widely used in the food industry.
Other major consumers of the algae are the cosmetics and pharmaceutical industries.

The following substances can be extracted from macroalgae:
Chlorophyll, β-carotene, essential amino acids (aspartic acid, glutamic acid, and phenylalanine) and phytohormones (indoleacetic acid, zeatin, kinetin, and gibberellic acid), agar agar (vegetable gelling agent), carrageenan.

Kappaphycus alvarezii also has good antioxidant potential, which neutralizes harmful free radicals and protects cells from oxidative stress, slowing down the aging process and preventing diseases such as cancer and cardiovascular disease.

The algae comes in the following colors: red, green, yellow, orange, and shades of orange-yellow.

Over the years, Kappaphycus alvarezii has been introduced to Hawaii, Fiji, and Tanzania, among other places, and is now commercially cultivated on a large scale in aquaculture in many places.
In general, the price for dried, unprocessed algae ranges from $1.20 to $2.50, while processed varieties with higher gel strength can cost up to $4.00 per kilogram.

The thalli of the algae can reach a length of 30 cm.

The species name “alvarezii” honors Mr. Vicente Alvarez, a biologist with the Bureau of Fisheries and Aquatic Resources, who became the first manager of Marine Colloids in the Philippines.

Synonyms:
Eucheuma alvarezii Doty, 1985 · unaccepted
Eucheuma cottonii Weber-van Bosse, 1913 · unaccepted (synonym)
Eucheuma cottonii var. erecta No authority known · unaccepted (synonym)cm

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