Females with ripe eggs have been observed in spring and summer. The planktonic larvae occur in waters with a salinity down to 13%.
 O. limacina is a typical non-selective deposit feeder. The lack of food specialisation of adults contrasts sharply with the selectivity of juveniles for certain types of substrate. The species is food for demersal fish (Hartmann-Schröder, 1971; Wolff, 1973; Curtis, 1977; Kirkegaard, 1978; Fauchald & Jumars, 1979).