Pink sea fan  (Eunicella verrucosa)

Pink sea fans are formed from a colony of tiny polyps; they may be a deep pink to white in colour (3), and attach to the substrate with a broad base. Branches occur 2 to 4 cm above this base from a column which can reach 0.8 cm in diameter. Branching occurs in one plane, and the whole fan is orientated at right angles to the prevailing current in order to maximise the efficiency of filter feeding (2). The anemone-like polyps emerge from warty bumps along the branches (3).

This species is found in the waters of the south west of England between north Pembrokeshire and Dorset. It is also known from the west of Ireland (1) and around south-west Europe (2), reaching as far south as the Mediterranean (1). Old records indicate that this species was once present in the English Channel up to the Thames Estuary (3).

The pink sea fan attaches to rocky substrata such as large stable boulders or upward facing bedrock. They only occur at depths below the level where algae dominate, often below 15 m (1), with moderately strong currents or wave action (3).

Although there is no direct information on the reproduction of the pink sea fan, it is thought that larvae are short-lived and settle soon after release (6). It is a slow growing and long-lived species (specimens may reach 50 years old) and if a population is entirely lost from an area, recolonisation is likely to be very slow (6). The age can be determined (destructively) by the presence of internal growth rings, much like those of a tree (3). The pink sea fan provides habitat for the sea fan sea slug, (Tritonia nilsohdneri) and the rare sea fan anemone (Amphianthus dohrnii) (5).

This species is extremely vulnerable to physical disturbance (3). In the 1960s it was collected as souvenirs, which may have caused a long-term reduction in populations. Climate change may be a future concern, and damage may occur as a result of strikes by careless scuba divers' fins and entanglement in fishing nets. Smothering by seaweeds and other species may also cause the death of pink sea fans (1). Although classified as Nationally Scarce, this species is likely to have a wider range than current records indicate (3).

The pink sea fan is fully protected against killing, taking or injuring, and sale. It is a UK Biodiversity Action Plan (UK BAP) priority species, the resulting Species Action Plan aims to maintain the present distribution of the sea fan (1). The pink sea fan occurs in the Marine Nature Reserves (MNRs) of Lundy and Skomer; the zones of these MNRs were developed specifically to reflect the sensitivity of this species (1). As the pink sea fan is the host species for the sea anemone Amphianthus dohrnii, which is also a UK BAP priority, the conservation of these two species goes hand-in-hand (1). A project by The Marine Conservation Society is currently monitoring and assessing pink sea fans (2).

For more information on this species see the Marine Life Information Network (MarLIN) species account, available from:
http://www.marlin.ac.uk/species/Eunicellaverrucosa.htm

Information authenticated by Dr Keith Hiscock of the Marine Biological Association of the UK:
http://www.mba.ac.uk/