Certifier : 
Bureau Veritas Certification
Certified status : 
Certified since : 
11 Jul 2016
Certificate expires : 
10 Jul 2021


The slipper limpet (Crepidula fornicata) is a native of the Atlantic coast of North America, with an arched, rounded shell which varies in size from 20-50mm. It was introduced accidentally into European waters during the 1930s. The species acclimated well, and has since spread to all bays and estuaries from Norway to Spain, mostly living at depths from 0-5m. Today, the highest concentrations are found in the English Channel.

Cancale Bay is located in the western part of France’s famous Bay of Mont St Michel, covering a wide shallow sandy area in the lee of the Herpin Islands. The invasive slipper limpet is first thought to have reached the area at the beginning of the 1970s, the larvae finding favourable conditions due partly to the shell substrates created by the oyster farming which takes place in the bay. Dredging for the oysters has also dispersed the limpets over a wider area. The limpets now cause problems for the oyster fishery.

Gear and vessels targeting the limpets are subject to various limits and regulations, and areas are periodically closed to fishing to aid stock conservation.

The limpets in the fishery are dredged from September to late April. In the 2014-15 season, this produced a total catch of 741 tonnes.