Bild på S. balanoides

The Northern rock barnacle usually mates during the autumn or early winter. After the mating season the penis is thrown away, and a new one developes the following year. The eggs and sperm are stored in seperate mantle cavities a few months before mating takes place and fertilization can occur. The eggs hatch later and the resulting larvae stay with their mother until there is enough plankton in the spring.

Cannot regret their choice of dwelling place

After a few weeks in the water, it is time for the now roughly 0,5 mm large larvae to find a dwelling place. When they have transformed into the adult stage, and attached themselves to a rock where they no longer are mobile or able to change their place of dwelling. To find a suitable dwelling place, the larvae look for adults of their species. Where other barnacles live, the conditions should be suitable enough for the young to survive, and close enough to other individuals so mating can occur at a later date.

Bands of barnacles that have developed over different years. Usually, larvae try and attach themselves to areas which are already colonised by adults, but because of variations in sea-level, e.g. because of the weather, the larvae cannot always reach the same level as earlier larvae.

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Kicks in its food

White belts

Long penis

Dwelling place

Can holds its breath

The dogwhelk kills


Other specie

Northern rock barnacle    More facts     Other names
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Bo Johannesson | Martin Larsvik | Lars-Ove Loo | Helena Samuelsson