Abstract: Indoor artificial breeding of clam Dosinia laminata was carried out, and 3 millions of juveniles with shell length of 1.2 - 1.5 mm were produced from May to September in 2007. The fecundity was found to be 2 millions per female with shell length of （60.90 ± 2.24） mm, and the D - larvae were observed after about 22 hours and 40 minutes after fertilization at water temperature of 24.5 - 25.5℃, salinity 27 and pH 7.5. The eggs were （70.33 ± 1.06） μm in diameter, and the D - larvae, postlarvae, single - siphon and double - siphon juveniles had shell length x shell height of （ 100.33 ± 1.30） μm × （81.07 ± 1.72） μm, （213.33 ± 8.02） μm × （202 ± 5.96 ） μm, （309.17± 9.17 ） μm × （301.67 ± 10.81 ） μm, and （ 1158.33 ± 9.31 ） μm × （ 1067.50 ± 10.84 ） μm, respectively. The daily growth of （8.28 ± 0.70 ） μm × （9.19 ± 0.76 ） μm , and survival rate of （ 36.8 ± 3.78 ） % was kept during the pelagic stage. During the metamorphosis （4 - 5 days）, the daily growth was （ 8.46 ± 0.42 ） μm × （ 8.04 ±0.45） μm, with metamorphic rate of （5 ± 1.25）%. The later single -siphon, and double -siphon juveniles had good growth at average rate of （32.19±20.63） μm × （28.75 ± 19.71 ） μm, （53.07 ±40.43） μm × （47.86 ± 38.22） μm per day,and survival rate of （81.2 ± 3.36）%. Compared with other substrata, the sea mud as a substrate had better collection of juveniles.
2008, Vol. 23 
