Comparison on Purification Effect of Two Macroalgae Species on Prawn Tailwater  

作　　者：Tingting ZHOU Jing HE Zhihua LIN Lin HE 

机构地区：[1]Ninghai Institute of Mariculture Breeding and Seed industry,Zhejiang Wanli University,Ningbo 315100,China

出　　处：《Agricultural Biotechnology》2021年第2期102-106,共5页农业生物技术（英文版）

基　　金：Ningbo City's 2015 Science and Technology Project for Enriching People:Optimization and Promotion of Prawn,Shellfish and Algae Ponds Integrated Aquaculture Technology(2015C10008);Ningbo Science and Technology Planning Project(2019C10039);Research and Development Project of Ecological and Efficient Clean Aquaculture of Mudflat Shellfish(2019C02054);China Shellfish Research System(CARS-49).

摘　　要：[Objectives]This study was conducted to investigate the purification effects of two common large seaweeds on the tail water of prawn farming in greenhouses,and to determine the best culture density of seaweeds.[Methods]Two large seaweed species,Gracilaria lichevoides and Ulva lactuca,were selected to set four culture densities of 0.5,2,4 g/L and a blank control group,respectively.The seaweeds were cultured in 100 L white polyethylene buckets,each of which contained 50 L of tail water from prawn culture.[Results]After 5 d,the nutrient removal rates of the two seaweeds were directly proportional to the density.There was no significant difference in NH_(4)-N removal rate between G.lichevoides and U.lactuca(P>0.05)by two-way analysis of variance,and the NH_(4)-N removal rate of the latter was higher.The removal rates of NO_(3)-N,TN and TP by G.lichevoides were significantly higher than those by U.lactuca(P<0.05).The specific growth rates of seaweeds were negatively correlated with their culture densities.The specific growth rates of G.lichevoides were 5.73%,1.654%and 0.48%,respectively,and those of U.lactuca were 2.01%,1.187%and 0.138%,respectively,when the culture densities were 0.5,2.0 and 4.0 g/L.Two-factor analysis of variance showed that the former was significantly higher than the latter,when the culture density of the two species of seaweeds was 0.5 g/L(P<0.05).The two-way analysis of variance showed that when the culture density of the two kinds of seaweeds was 0.5 g/L,the specific growth rate of G.lichevoides was significantly higher than that of U.lactuca(P<0.05).Based on the above research,the two macroalgae could reduce the nutrients in the wastewater to a large extent,but the culture density determined the scale and economic benefits of seaweed cultivation and further affected the normal growth,metabolism and quality of the seaweeds.[Conclusions]This study provides some theoretical basis for large-scale seaweed farming and biological selection of in-situ ecological restoration of eutrophic seawater.

关 键 词：MACROALGA Purification efficiency Nutrient salt Aquaculture tail water 

分 类 号：X173[环境科学与工程—环境科学] X714