Major problems found in artificial reproduction of bay scallop (\%Argopecten irradians\%) were discussed in terms of practices on Dalian region from 1993 to 1998 1) Broodstock wintered at at 2～5 ℃ were fed \%Nitzschia closterium\% (30×10\+4～50×10\+4 cells/mL) supplemented with \%Chlorella\% sp and egg yolk and had a mortality of 1 9%, 4 0% and 9 98% during maturation-inducing However, the broodstock wintered at below 0℃ were fed the same food and had an increased mortality of 15 87%, 18 8%, 26 27% and 32 07% during maturation-inducing, indicating that there is influence of water temperature on survival of the broodstock during wintering period 2) The gonads develop significantly rapidly at 15～20℃, and would be damaged, even destroyed embryos without enough feed 3) Spawning occurs at accumulated temperature of 418 4～499 0 ℃ and gonado-somatic index of ovary 10 2 4) The larvae should be fed \%Isochrysis zhanjianggensis\% (5 0×10\+4 cells/mL), supplemented with \%Nitzschia closterium\% (3 0×10\+4 cells/mL), and \%Chlorella\% sp (10 0×10\+4 cells/mL) 5) The reasons for unstable production of bay scallop larvae were analyzed and and some recommendations are provided regarding to improvement of artificial propogation of bay scallop
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