BIOTIC Species Information for Cerastoderma glaucum
Researched byNicola White Data supplied byMarLIN
Refereed byDr Richard S.K. Barnes
Scientific nameCerastoderma glaucum Common nameLagoon cockle
MCS CodeW1962 Recent SynonymsCardium lamarckii

PhylumMollusca Subphylum
Superclass ClassPelecypoda
Subclass OrderVeneroida
Suborder FamilyCardiidae
GenusCerastoderma Speciesglaucum

Additional InformationNo text entered
Taxonomy References Howson & Picton, 1997,
General Biology
Growth formBivalved
Feeding methodActive suspension feeder
Environmental positionInfaunal
Typical food typesNo text entered HabitFree living
Bioturbator FlexibilityNone (< 10 degrees)
FragilityRobust SizeSmall-medium(3-10cm)
HeightInsufficient information Growth Rate9.6 mm/year
Adult dispersal potential100-1000m DependencyIndependent
General Biology Additional InformationThe species exists in two forms, a typical thin-shelled variety found in brackish lagoon habitats and a thicker shelled variety occurring in estuaries. Growth rate during the first year takes place at a mean of 9.6 mm per year in Essex. Thereafter growth rate decreases to 4.9 mm in the second year and 2.5 mm in the third year (Boyden, 1972).
Biology References Barnes, 1973, Boyden, 1972, Boyden & Russel, 1972, Barnes, 1980b, Barnes, 1994, Brock, 1979, Rygg, 1970, Ansell et al., 1981,
Distribution and Habitat
Distribution in Britain & IrelandOrkney, Firth of Forth, East Anglia, Deben & Orwell estuaries, south coast of England, south Wales, the west coast of Scotland, and south and west coasts of Ireland.
Global distributionOccurs from Norway and the Baltic to the Mediterranean and Black Seas.
Biogeographic rangeNot researched Depth rangeShallow
MigratoryNon-migratory / Resident   
Distribution Additional InformationThe adult and juvenile populations are distributed differently. Juveniles (0.5-10 mm) attach to filamentous algae by means of byssus threads. When they reach a certain age, they migrate to the adult free-living sediment population (Labourg & Lasserre, 1980).

Substratum preferencesCoarse clean sand
Fine clean sand
Sandy mud
Muddy sand
Physiographic preferencesEstuary
Isolated saline water (Lagoon)
Biological zoneLower Eulittoral
Sublittoral Fringe
Wave exposureSheltered
Very Sheltered
Tidal stream strength/Water flowWeak (<1 kn)
SalinityLow (<18 psu)
Variable (18-40 psu)
Habitat Preferences Additional Information
Distribution References Labourg & Lasserre, 1980, Barnes, 1973, Boyden, 1972, Boyden & Russel, 1972, Barnes, 1980b, Barnes, 1994, Brock, 1979, Rygg, 1970, Ansell et al., 1981, Seaward, 1982, Seaward, 1990, Anonymous, 1999(s),
Reproduction/Life History
Reproductive typeGonochoristic
Developmental mechanismPlanktotrophic
Reproductive SeasonMay to July Reproductive LocationInsufficient information
Reproductive frequencyAnnual episodic Regeneration potential No
Life span3-5 years Age at reproductive maturityInsufficient information
Generation timeInsufficient information FecundityInsufficient information
Egg/propagule sizeInsufficient information Fertilization typeInsufficient information
Larval/Juvenile dispersal potentialInsufficient information Larval settlement periodInsufficient information
Duration of larval stage11-30 days   
Reproduction Preferences Additional InformationVeliger larvae have a pelagic life of from 11 to 30 days. Newly settled young attach temporarily by byssus threads to filamentous algae before becoming buried in the top few centimetres of sediment. Gametogenesis occurs in early spring and spawning takes place from May to July. Individuals live for about five years.
Reproduction References Barnes, 1973, Rygg, 1970, Ansell et al., 1981,
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