Sunday 19 May
Common starfish (Asterias rubens)
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Common starfish fact file
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Common starfish description
The common starfish (Asterias rubens) has five arms (although individuals may occasionally have just four or as many as six) (2). The colour of the common starfish varies from red to yellowish-brown and more rarely violet (2). The upper surfaces of the arms feature a row of spines along the centre, and the underside has rows of 'tube-feet', which have suckers at the tips (2).
- Diameter: 15 cm (2)
Common starfish biology
This predatory species takes a range of marine prey including other echinoderms (sea urchins, starfish and brittlestars), worms and molluscs as well as carrion (3). It often prizes bivalve shells apart, using the suckers on the tube-feet. Once a small gap has been opened, the common starfish inserts the lobes of its stomach inside the shell, and starts to digest the bivalve (2). This starfish has a good sense of smell, which helps it to locate its prey and avoid predators (3). Some of its prey species are able to smell the starfish as it approaches and avoid it (3).
The sexes are separate, breeding occurs in spring and summer and fertilisation occurs externally (2). The early larval stage of the common starfish (called a 'bipinnaria' larva) is planktonic, transforming into a 'brachiolaria' larva before undergoing full metamorphosis and settling around 87 days after fertilisation (3). The life-span of a common starfish is between 5 and 10 years (3). Large aggregations occasionally form, of around 100 individuals per square metre (3). It is not known what triggers these aggregations (3).Top
Common starfish range
The common starfish is common and widespread around the coasts of Britain and Ireland, and throughout the northeast Atlantic from Norway to Senegal (3).Top
Common starfish habitatTop
Common starfish status
The common starfish is widespread in Britain (3).Top
Common starfish threats
The common starfish is not currently threatened.Top
Common starfish conservation
Conservation action has not been targeted at the common starfish.Top
Find out more
For more on the common starfish, see:
Marine Life Information Network (MarLIN) - Common Starfish, Asterias rubens:
This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
- Stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
- Of the stage in an animal’s lifecycle after it hatches from the egg. Larvae are typically very different in appearance to adults; they are able to feed and move around but usually are unable to reproduce.
- An abrupt physical change from the larval to the adult form.
- Aquatic organisms that drift with water movements; may be either phytoplankton (plants), or zooplankton (animals).
National Biodiversity Network Species Dictionary (January, 2003)
- Fish, J.D. and Fish, S. (1996) A Student's Guide to the Seashore. Second Edition. Cambridge University Press, Cambridge.
Budd, G., 2001. Asterias rubens. Common starfish. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. (August, 2002)
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