Aquaculture in saline-alkaline water has a major problem:microalgal blooming causes the p H of water to increase dramatically,thereby causing damage to the reared organisms.To solve this problem,we set out to fi nd a ...Aquaculture in saline-alkaline water has a major problem:microalgal blooming causes the p H of water to increase dramatically,thereby causing damage to the reared organisms.To solve this problem,we set out to fi nd a candidate fi lter-feeding bivalve species suitable for saline-alkaline water to graze on microalgae and to control the p H.In the current study,we investigated the ef fect of carbonate alkalinity(CA,2.5,10.0,and 20.0 meq/L)and p H(8.0,8.5,and 9.0)on the grazing capacity(GC)of the clam Cyclina sinensis.Additionally,the ef fect of clam size(small,medium,and large)and microalgae species(Nannochloropsis oculata,Chaetoceros müelleri,and Isochrysis galbana),and the ef fect of bottom sediment characteristic(mud,sandy mud,and muddy sand)and thickness(3 and 6 cm)were analyzed as well.The results show that the GC on I.galbana was the highest and small size had the maximum GC/W(W:wet weight including body and shells).No significant differences were observed between sediment type and thickness.Regarding CA and p H,a significant decrease in GC by the pH or by their interaction was found.The GC of C.sinensis was not greatly reduced in the treatments of p H≤8.5 and CA≤20.0,and also not aff ected by bottom sediment type,indicating that this clam is capable to manage microalgal concentrations and might be a candidate species for pH reduction in saline-alkaline water ponds.展开更多
基金Supported by the Special Fund of Chinese Central Government for Basic Scientific Research Operations in Commonweal Research Institutes titled“Eff ect of p H on the Larva Development and Carbon Sequestration of Several Intertidal Zone Bivalves in the East China Sea(Chinese Academy of Fishery Sciences)(No.2014A01YY02)the Returned Central Royalties for Using Sea Areas titled“Demonstration for Ecological Restoration and Environmental Improvement in Fengxian Sea Area Located in the Northern Seacoast of Hangzhou Bay”
文摘Aquaculture in saline-alkaline water has a major problem:microalgal blooming causes the p H of water to increase dramatically,thereby causing damage to the reared organisms.To solve this problem,we set out to fi nd a candidate fi lter-feeding bivalve species suitable for saline-alkaline water to graze on microalgae and to control the p H.In the current study,we investigated the ef fect of carbonate alkalinity(CA,2.5,10.0,and 20.0 meq/L)and p H(8.0,8.5,and 9.0)on the grazing capacity(GC)of the clam Cyclina sinensis.Additionally,the ef fect of clam size(small,medium,and large)and microalgae species(Nannochloropsis oculata,Chaetoceros müelleri,and Isochrysis galbana),and the ef fect of bottom sediment characteristic(mud,sandy mud,and muddy sand)and thickness(3 and 6 cm)were analyzed as well.The results show that the GC on I.galbana was the highest and small size had the maximum GC/W(W:wet weight including body and shells).No significant differences were observed between sediment type and thickness.Regarding CA and p H,a significant decrease in GC by the pH or by their interaction was found.The GC of C.sinensis was not greatly reduced in the treatments of p H≤8.5 and CA≤20.0,and also not aff ected by bottom sediment type,indicating that this clam is capable to manage microalgal concentrations and might be a candidate species for pH reduction in saline-alkaline water ponds.
