Abstract
Life cycle, growth, mortality and production of the polychaetes Nereis virens and N. diversicolor were studied in Norsminde Fjord, Denmark. When 3 yr old, N. virens showed synchronous spawning induced at new moon in April when water temperature was 10–12°C. Nereis diversicolor showed a prolonged spawning during early spring and summer at an age of 12–18 months. Average weight‐specific growth rate for N. virens and N. diversicolor were O.0062 and 0.0050 d−1, respectively; showing a reduced rate with age. Annual mortalities of 76–77% and 98%, respectively, reduced N. virens to 1.2–1.4% and N. diversicolor to 1.2–2.3% of the initial population at the time of spawning. Annual production of N. virens and N. diversicolor was 23.73 and 27.17 g AFDW m−2, tantamount to an annual turnover (P/B) of 2.52 and 2.60, respectively.
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