AquaNISInformation system on aquatic non-indigenous and cryptogenic species |
Species | Crepidula fornicata | |
Date of the first record (?) | 1893 References (not structured): Nunn JD, Holmes JMC (2008) A Catalogue of the Irish and British marine mollusca in the collections of the National Museum, Natural History 1835-2008. http://www.habitas.org.uk/nmi_catalogue/index.html (accessed 20 October 2015).Minchin D, McGrath D, Duggan CB (1995) The slipper limpet Crepidula fornicata (L.) in Irish waters with a review of its occurrence in the north-east Atlantic. Journal of Conchcology, London, 35(5): 297-301. Syke ER (1905) The molluscs and brachiopods of Ballinakill and Bofin Harbours, Co. Galwav, and the deep water off the west and south-west coasts of Ireland. Annual Report for Fisheries,Ireland 1902-03, Part 2: 53-92. Comments: The first record is of a single specimen in the Natural History Museum Dublin from 1893 from Dublin Bay. At this time American oysters were being imported in barrels from the USA and some were relaid in Dublin Bay and this may account for the finding of the single specimen at this time. A decade later oysters from Essex were being used in growth trails in Ballinakill Bay. C. fornicata were noted in a 1902 consignment and were removed by Sykes. |
Recipient region (?) | Country: Ireland LME: 24. Celtic-Biscay Shelf LME sub-region: Celtic seas References (not structured): Minchin D, McGrath D, Duggan CB (1995) The slipper limpet Crepidula fornicata (L.) in Irish waters with a review of its occurrence in the north-east Atlantic. Journal of Conchcology, London, 35(5): 297-301. Sykes,E. R. (1905) The molluscs and brachiopods of Ballinakill and Bofin Harbours, Co. Galwav, and the deep water off the west and south-west coasts of Ireland. Annual Report for Fisheries,Ireland 1902-03, Part 2: 53-92. Comments: The 1893 specimen was from Portmarnock, Dublin Bay. |
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Source region (?) | Not entered References (not structured): Minchin D, McGrath D, Duggan CB (1995) The slipper limpet Crepidula fornicata (L.) in Irish waters with a review of its occurrence in the north-east Atlantic. Journal of Conchcology, London, 35(5): 297-301. Sykes ER (1905) The molluscs and brachiopods of Ballinakill and Bofin Harbours, Co. Galwav, and the deep water off the west and south-west coasts of Ireland. Annual Report for Fisheries,Ireland 1902-03, Part 2: 53-92. Comments: The first record of slipper limpets in Ireland were probably imported with American oysters. |
Pathway / Vector (?) | Level of certainty: Direct evidence Pathway: Culture activities Vector: Regional stock movement References (not structured): Minchin D, McGrath D, Duggan CB (1995) The slipper limpet Crepidula fornicata (L.) in Irish waters with a review of its occurrence in the north-east Atlantic. Journal of Conchcology, London, 35(5): 297-301. Sykes,E. R. (1905) The molluscs and brachiopods of Ballinakill and Bofin Harbours, Co. Galwav, and the deep water off the west and south-west coasts of Ireland. Annual Report for Fisheries,Ireland 1902-03, Part 2: 53-92. McNeill G, Nunn J, Minchin D (2010) The slipper limpet Crepidula fornicata Linnaeus, 1758 becomes established in Ireland. Aquatic Invasions 5 Supplement 1: S21-25. Comments: Several occurrences of slipper limpets occurred during the early to mid 1900s and all would appear to have been associated with imports of laying oysters. The most recent living population is most probably as a result of mussels originating from south Wales being dumped in the Bay following their refusal for sale. |
Habitat type (?) | Sheltered coastal area References (not structured): McNeill G, Nunn J, Minchin D (2010) The slipper limpet Crepidula fornicata Linnaeus, 1758 becomes established in Ireland. Aquatic Invasions 5 Supplement 1: S21-25. Comments: The only known existing population in Belfast lough occurs in a semi-sheltered coastal area. |
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Wave exposure (?) | Semi exposed Sheltered References (not structured): McNeill G, Nunn J, Minchin D (2010) The slipper limpet Crepidula fornicata Linnaeus, 1758 becomes established in Ireland. Aquatic Invasions 5 Supplement 1: S21-25. Comments: Generally all of the records were from sheltered environments but the recent and established population in Belfast lough is in a semi-exposed area of the bay. |
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Salinity range (?) | Exact range: 19 - 37 References (not structured): Walne PR (1956) The biology and distribution of the slipper limpet Crepidula fornicata in Essex Rivers. Fishery Investigations, Ministry of Agriculture, Fisheries and Food. Series II, 10(6):1-50. Comments: No doubt the tolerance is greater than that found in experiments by Walne (1956). |
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Temperature range (?) | Unknown References (not structured): Walne PR (1956) The biology and distribution of the slipper limpet Crepidula fornicata in Essex Rivers. Fishery Investigations, Ministry of Agriculture, Fisheries and Food. Series II, 10(6):1-50. Comments: Limpets succumb at temperatures of -5 to -6 C and in cold winter periods mortalities of limpets on the lower shore were noted in Essex, Britain. |
Zonation / Substratum (?) | Benthic: Littoral (Benthic) Sublittoral beyond photic zone Sublittoral within photic zone Substratum: Soft (mud to pebbles) References (not structured): McNeill G, Nunn J, Minchin D (2010) The slipper limpet Crepidula fornicata Linnaeus, 1758 becomes established in Ireland. Aquatic Invasions 5 Supplement 1: S21-25. Comments: The living Irish population was found at lowest tide levels to ~7m depth |
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Reproductive duration (?) | Medium References (not structured): Walne PR (1956) The biology and distribution of the slipper limpet Crepidula fornicata in Essex Rivers. Fishery Investigations, Ministry of Agriculture, Fisheries and Food. Series II, 10(6):1-50. Comments: Males crawl over the bottom and are attracted to snails that have developed to females and attach to them. Such groups, known as 'chains' were present in the dredged samples indication the capability to reproduce in Belfast Lough. | |
Reproductive seasonality (?) | Apr. May Jun. References (not structured): Walne PR (1956) The biology and distribution of the slipper limpet Crepidula fornicata in Essex Rivers. Fishery Investigations, Ministry of Agriculture, Fisheries and Food. Series II, 10(6):1-50. Comments: In Essex spawning takes place once temperatures attain 10C, this is usually towards the end of April in shallow bays |
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Migration pattern (?) | Not entered |
Population status (?) | Common (Moderate level of certainty) References (not structured): McNeill G, Nunn J, Minchin D (2010) The slipper limpet Crepidula fornicata Linnaeus, 1758 becomes established in Ireland. Aquatic Invasions 5 Supplement 1: S21-25. Minchin D, McGrath D, Duggan CB (1995) The slipper limpet Crepidula fornicata (L.) in Irish waters with a review of its occurrence in the north-east Atlantic. Journal of Conchcology, London, 35(5): 297-301. Minchin D, Nunn J (2006) Further range extensions of the marine gastropod Calyptraea chinensis (L.) in Ireland. Irish Naturalists’ Journal. 28 (5): 200-203. Nunn JD, Holmes JMC (2008) A Catalogue of the Irish and British marine mollusca in the collections of the National Museum, Natural History 1835-2008. http://www.habitas.org.uk/nmi_catalogue/index.html (accessed 20 October 2015). Arnold DC 1960. Occurrence of the slipper limpet, Crcpidula fornicata L. in Ireland. Nature 196: 95. Spicer JI (1923) The slipper limpet, an enemy of the oyster. Fish. Tech. Rep., Dublin 4pp. Comments: The recently found living population in Belfast Lough is established and is likely to be spread. It is the only surviving population in Ireland at present (2013). All previous records are of shells or populations that have expired and include the records of Arnold (1960)from Kilmakilloge Harbour, Kenmare Bay. Previously there have been accounts of the slipper limpet in Ireland dating from the import of Crassostrea virginica in 1902 (Sykes, 1905), all of which were presumably removed. From 1915 specimens were collected at Omeath, Carlingford Lough and were lodged in the Natural History Museum, Dublin. Such was the concern in these early years that leaflet was produced to advice upon the risks of the species becoming introduced and being vigilant in their disposal when dredged with oysters. A population was found in Clew Bay and in the 1963 study of the oyster beds, following the severe winter, no living slipper limpets or their shells were recovered (Minchin et al. 1995). Shells of limpets were recovered from Tralee Bay but these were in a consignment of autoclaved oyster shell used for laying in Tralee Bay as clutch for improving native oyster spat settlements. During 2000 and 2001 consignments of Pacific oysters for culture, in Waterford Harbour in bags on trestles, had some small male specimens associated with consignments. A follow-up study failed to find any living after three months. |
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Species status (?) | Non-indigenous species References (not structured): Abbott RT (1954) American Seashells, the New Illustrated Naturalist, D. Van Nostrand Co Inc., New York 541pp. Comments: In its native region it occurs from Canada to Texas. |
Created by | Dan Minchin |
Last update by | Dan Minchin, 2013-11-05 |