Donate Take Action

Join us


Marine Animal Encyclopedia

Cotton's Seaweed Kappaphycus cottonii

Formerly called Eucheuma cottonii, Cotton's seaweed is a much-branched, cylindrical red seaweed that is farmed extensively in the Philippines for extraction of carrageenan, a gelling agent similar to agar (see Seaweed Jelly). In the wild, it grows attached to rocks or lies loose in sheltered places. Like some other red seaweeds, Cotton's seaweed's fronds are often shades of green and brown rather than red.

Cotton’s Seaweed habitat mapzoom image
  • Kingdom Phaeophyta
  • Length 20 in (50 cm)
  • Habitat Intertidal and shallow subtidal rocks
  • Water_temperature 50–86°F (10–30°C)
  • Distribution Coasts of Africa, southern and eastern Asia, and Pacific islands