BIOTIC Species Information for Balanus crenatus
Researched byNicola White Data supplied byMarLIN
Refereed byProf. Alan J. Southward
General Biology
Growth formConical
Feeding methodPassive suspension feeder
Active suspension feeder
Mobility/MovementPermanent attachment
Environmental positionEpifaunal
Typical food typesZooplankton and other organic particles of a suitable size, such as detritus and phytoplankton. HabitAttached
BioturbatorNot relevant FlexibilityNone (< 10 degrees)
FragilityRobust SizeSmall(1-2cm)
HeightInsufficient information Growth Rate4.4 mm/month
Adult dispersal potentialNone DependencyIndependent
General Biology Additional InformationBalanus crenatus has a calcareous base, while Semibalanus balanoides has a membranous base.
Balanus crenatus feeds by extending thoracic appendages called cirri out from the shell to filter zooplankton from the water. In the absence of any current, the barnacle rhythmically beats the cirri. When a current is present Balanus crenatus holds the cirri fully extended in the current flow. Barnacles feed most during spring and autumn when plankton levels are highest. Little if any feeding takes place during winter, when barnacles rely on stored food reserves. Feeding rate is important in determining the rate of growth.
Barnacles need to moult in order to grow. Frequency of moulting is determined by feeding rate and temperature. Moulting does not take place during winter when phytoplankton levels and temperatures are low.
Balanus crenatus is hermaphroditic and grows up to 25mm in diameter.
Biology References Rainbow, 1984, Barnes et al., 1963, Bassindale, 1964,
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