Influence of salinity stress on grow th and survival of M anila clam Ruditapes philippinarum at various developmental stages
FAN Chao，WEN Zi-chuan，HUO Zhong-ming，YANG Feng，YAN Xi-wu
College of Fisheries and Life Science，Engineering Research Center of Shellfish Culture and Breeding in Liaoning Province，Dalian Ocean University，Dalian 116023，China
Abstract: The growth and survival of larvae，juvenile，and 1-year old youth（shell length 10 mm）of Manila clam Ruditapes philippinarum were studied ata salinity of5，8，11，14，32（control），38，41，44，and 47 atwater temperature of 20℃.The results showed that there were significant effects of salinity stress on growth and survival of the clam，with themaximal survival rates（97.87％±3.69％，100％，and 100％）in 72 h in the three stages at salinity of 38（P＜0.05）and mortality at salinity of 5.The best daily growth was observed in larvae（4.83μm±0.03 μm）and juveniles（6.81μm±0.11μm）at a salinity of38，poorer than that in the control group and significantly better than that in the other groups（P＜0.05）.Itwas found that the range of salinity tolerancewas decreased as the clam developed，with survival rate of（50.27±3.76）％in 21 day old larvae at a salinity of38，significantly lower than that in the other groups（P＜0.05），even mortality in the other groups.In 30 days salinity stress，however，the juveniles had survival rate of（68.75±5.25）％in a salinity of38，without significantly different from that in the control group（P＞0.05），evenmortality in the other groups.Therewas survival rate of（94.36±2.03）％ata salinity of 14，without significant difference compared to that in the control group（P＞0.05），and survival rate of（60.00±14.53）％at a salinity of 38，significantly lower than that in the control group（P＜0.05），in the youth clam exposed to salinity stress for 30 days.The findings provided a theoretical basis for eco-breeding of resistant clam strains.
范超, 温子川, 霍忠明, 杨凤, 闫喜武. 盐度胁迫对不同发育时期菲律宾蛤仔生长和存活的影响[J]. 大连海洋大学学报, 2016, 31(5): 497-504.
FAN Chao, WEN Zi-chuan, HUO Zhong-ming, YANG Feng, YAN Xi-wu. Influence of salinity stress on grow th and survival of M anila clam Ruditapes philippinarum at various developmental stages. Journal of Dalian Ocean University, 2016, 31(5): 497-504.
2016, Vol. 31 
