Reproduction in Hydroides elegans is sexual and the the sexes are separate (NIMPIS 2002), although some sources (e.g., CSIRO 2001) report the species as hermaphroditic. Gametes are released to the environment and fertilization is external (Nishi 1992). Qiu and Qian (1998) report that most reproductive individuals had tube lengths of 12 mm or more and average fecundity ranged between 1100-9050 oocytes per female.Reproductive seasonality varies by location and has been reported as occurring from late summer to early winter in both hemispheres with some populations in milder climates capable of year-round reproduction (Miura and Kajihara 1984, Udhayakumar and Karande 1996, Lewis and Smith 1991). Qiu and Qian (1998) suggest salinities above 25 ppt and temperatures above 20°C are requisite conditions for reproduction.
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