Reproduction in Teredo navalis is sexual and individuals become reproductive as 6 weeks post-settlement. Spawning is temperature dependant, occurring from April-September in Barnegat Bay, New Jersey, and slightly later (May-October) at Woods Hole, Massachusetts, once the water has warmed somewhat. Salinities of 12 ppt or greater may be required. Male gametes are released to the water column and subsequently taken in through the incurrent siphons of other individuals in which fertilization occurs internally within the epibranchial cavity (Grave 1928, 1942, Coe 1941, Lane 1959, Richards et al. 1984, NIMPIS 2002, Did?iulis 2007).Fecundity in this species is high with individual worms capable of brooding 1-5 million larvae (Grave 1928). Evidence of hermaphroditism has been recorded in young animals but the sexes appear to be separate as adults (NIMPIS, 2002).
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