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Annual variations of egg production rate (EPR) and clutch size of  Calanus sinicus , as well as body size of females (prosome length and dry weight), were investigated at a series of stations in the Southern Yellow Sea by onboard incubation.  Calanus sinicus  was spawning in all the 11 cruises investigated, and the annual variation of EPR was bimodal. Monthly average EPR was highest from May to July, respectively, 5.97, 5.36 and 6.30 eggs female −1  d −1 , then decreased dramatically to only 1.37 eggs female −1  d −1  in August and attained the lowest 1.07 eggs female −1  d −1  in October. In November, average EPR increased again to 4.31 eggs female −1  d −1 . Seasonal variation of clutch size was similar to EPR, except that it decreased gradually after August rather than dramatically as did EPR. Prosome length of females was maximum in May and minimum in October, but dry weight was highest in November. Monthly average EPR correlated better with prosome length than dry weight, while clutch size was rather determined by dry weight of females. It is suggested that egg production of  C. sinicus  was active during two discontinuous periods when both surface and bottom temperature fell into its favorite range (i.e. 10–23°C), and different reproductive strategies were adopted in these two reproductive peaks: other than the highest EPR, longer prosome length was also achieved by  C .  sinicus  from May to July, while females in November developed shorter bodies but accumulated more energy for reproduction.

Seasonal variation of reproduction rates and body size of Calanus sinicus in the Southern Yellow Sea, China