Tuesday 21 May
Fairy shrimp (Chirocephalus diaphanus)
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Fairy shrimp fact file
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Fairy shrimp description
The fairy shrimp is a beautiful, translucent crustacean, which lacks a carapace, and is considered to be rather primitive as it has a relatively large number of segments and the legs are not specialised (5). The body is elongated, and bears 11 pairs of legs fringed with bristles; the head curves downwards, and in males the second pair of antennae are modified 'claspers' for grabbing females during mating (6). Fairy shrimps swim around on their backs, propelled by the constantly moving legs (5).
- Body length: 25 mm (2)
Fairy shrimp biology
The fairy shrimp has been found throughout the year, and has even been found in ice-covered water (3). It feeds on microscopic animals and organic particles, which are either taken from the water with the legs or scraped from the bottom of the pond (3). It has an extremely fast life-cycle, and fairy shrimp eggs are able to survive when the temporary pond habitat dries out; when they become wet once more they hatch, but some eggs remain dormant so that if conditions quickly deteriorate again, some eggs will survive (3). Various animals, including ponies, deer and cattle disperse the eggs from pool to pool (3).Top
Fairy shrimp range
This is the only fairy shrimp in Britain; it has formerly been recorded throughout much of England as far north as York, but has more recently become restricted to Devon, Cornwall, the New Forest, and Cambridgeshire (3). Elsewhere, it is found in continental Europe (3).Top
Fairy shrimp habitat
This species inhabits temporary pools, ranging from ponds to muddy ruts, and shows a preference for sites that are subject to regular disturbance by vehicles, livestock, or ploughing (livestock also enrich the site with their dung). The fairy shrimp cannot co-exist with fish and has a broad tolerance of varying levels of temperature, oxygen levels and water chemistry (3).Top
Fairy shrimp status
Classified as Vulnerable in the British Red Data Book (3), fully protected in the UK under Schedule 5 of the Wildlife and Countryside Act 1981 and listed as a Species of Conservation Concern under the UK Biodiversity Action Plan, although not a priority species (4).Top
Fairy shrimp threats
A main threat facing the fairy shrimp is the perception of its habitats as 'unsightly'; temporary pools are often infilled or converted to permanent ponds. Furthermore, water abstraction, causing a lowering of the water table and a loss of suitable habitat has also occurred at some sites. In the early 20th century, the fairy shrimp was known from common land in Buckinghamshire and Hertfordshire, but the decline of traditional grazing on the commons has eliminated suitable habitat through conversion to scrub and woodland (3).Top
Fairy shrimp conservation
Several colonies of the fairy shrimp are located within Sites of Special Scientific Interest (SSSIs), however this does not seem to protect this species. Suitable habitats need active management, and cattle trampling and grazing should be encouraged (3). The fairy shrimp is fully protected in the UK under Schedule 5 of the Wildlife and Countryside Act 1981 and listed as a Species of Conservation Concern under the UK Biodiversity Action Plan, although not a priority species (2).Top
Find out more
For more on this species see: British Red Data Books 3: Invertebrates other than insects (JNCC).
For more on invertebrates and their conservation see Buglife, the Invertebrate Conservation Trust at:
You can see the fairy shrimp by visiting the Salisbury Plain:
Royal Geographical Society’s Discovering Britain walks:
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:
- The top shell of a turtle. In arthropods (insects, crabs etc), the fused head and thorax (the part of the body located near the head) also known as ‘cephalothorax’.
National Biodiversity Network Species Dictionary (Jan 2003):
- Macan, T. T. (1959) A guide to freshwater invertebrate animals. Longmans, Green & Co Ltd., London.
- Joint Nature Conservation Committee (1991) British Red Data Books 3: Invertebrates other than insects. JNCC, Peterborough.
- The Environment Agency (1998) Species and Habitats Handbook: look-up chart of species and their legal status. Environment Agency, Bristol.
- Nichols, D., Cooke, J. & Whiteley, D. (1971) The Oxford Book of Invertebrates. Oxford University Press, Oxford.
- Olsen, L., Sunesen, J., & Pedersen, B. V. (1999) Small freshwater creatures. Oxford University Press, Oxford.
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