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BiologyThe sexes are separate and individuals breed several times over a number of years in the periods April-May and August. The larvae are planktonic. N. caeca starts reproducing in its second year of life and lives for a period of about 7 years.
N. caeca is a predator moving through the top layer of the sediment in search for molluscs, crustaceans and other polychaetes. The species is eaten by juveniles of haddock and thornback (Hartmann-Schröder, 1971; Wolff, 1973; Curtis, 1977; Fauchald & Jumars, 1979; Sips, 1988; Fish & Fish, 1989; Olive & Morgan, 1991).