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Seaweeds > Division Chlorophyta
Codium green seaweed
Family Codiaceae
updated Feb 2020

Where seen? This spongy, velvety green seaweed is sometimes seen on our Southern shores. Branching forms sometimes blooms among seagrasses near reefs, e.g., at Pulau Semakau.

Features: Spongy but firm, texture velvety smooth. Commonly seen on the intertidal is Codium geppiorum which forms a cluster of thick, cylindrical 'stems' (6-8 cm) with rounded, knobbly tips. May be a compact ball of short branches, or a looser clump of longer branches. Colour olive green to dark green. Others, like Codium arabicum, forms encrusting layers on hard surfaces, often forming blobs with folds. Colour black or dark green to olive.

According to AlgaeBase, there are more than 140 current Codium species.

Lumpy blobby Codium green seaweed may be confused with Puffy brown seaweed (Colpomenia sinuosa) which is golden brown.

Role in the habitat: Some Codium species are eaten by sea turtles.

Invasive Codium: Some species of Codium are considered invasive alien introduced species in temperate shores. As these invasive Codium species take root, they displace the native kelp seaweeds and the marine life associated with these seaweeds. These invasive species are believed to have been introduced via attachment to ship hulls, or oyster shells, as fouling organisms in drag nets and packing material for fishery products.

Human uses: Some species are used as animal feed and eaten by people. In Korea, they are harvested fresh from the wild and sold in local markets. They are also used as insect repellant. They are reported to have anti-bacterial and anti-tumor properties.

Pulau Semakau, Feb 12

Tuas, Apr 05

Labrador, Apr 10

Terumbu Berkas, Jan 10
Photo shared by Loh Kok Sheng on his flickr.

Pulau Biola, Dec 09

Pulau Biola, Dec 09

*Species are difficult to positively identify without close examination of internal parts.
On this website, they are grouped by external features for convenience of display.

Codium green seaweeds on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

East Coast-Marina East, Jul 20
Photo shared by Vincent Choo on facebook.

East Coast (PCN), May 21
Photo shared by Vincent Choo on facebook.

Berlayar Creek, Feb 20
Photo shared by Nurulhuda Abdul Rahim on facebook.

Sentosa Serapong, Dec 20
Photo shared by Vincent Choo on facebook.

St John's Island, Oct 20
Photo shared by Vincent Choo on facebook.

Kusu Island, May 22
Photo shared by Richard Kuah on facebook.

Pulau Hantu, Apr 21
Photo shared by Vincent Choo on facebook.

Terumbu Pempang Tengah, May 23
Photo shared by Richard Kuah on facebook.

Codium recorded for Singapore
Pham, M. N., H. T. W. Tan, S. Mitrovic & H. H. T. Yeo, 2011. A Checklist of the Algae of Singapore.

  Codium arabicum
Codium effusum
Codium geppiorum
Codium tomentosum

Links References
  • Lee Ai Chin, Iris U. Baula, Lilibeth N. Miranda and Sin Tsai Min ; editors: Sin Tsai Min and Wang Luan Keng, A photographic guide to the marine algae of Singapore, 2015. Tropical Marine Science Institute, 201 pp.
  • Pham, M. N., H. T. W. Tan, S. Mitrovic & H. H. T. Yeo, 2011. A Checklist of the Algae of Singapore, 2nd Edition. Lee Kong Chian Natural History Museum, National University of Singapore, Singapore. 99 pp. Uploaded 1 October 2011. [PDF, 1.58 MB].
  • Huisman, John M. 2000. Marine Plants of Australia University of Western Australia Press. 300pp.
  • Calumpong, H. P. & Menez, E. G., 1997.Field Guide to the Common Mangroves, Seagrasses and Algae of the Philippines. Bookmark, Inc., the Philippines. 197 pp.
  • Trono, Gavino. C. Jr., 1997. Field Guide and Atlas of the Seaweed Resources of the Philippines.. Bookmark, Inc., the Philippines. 306 pp.
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