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研究了改性粘土对虾夷扇贝稚贝的急性和慢性影响,探索了改性粘土除藻过程中对虾夷扇贝稚贝的影响。96 h急性毒性实验发现,改性粘土对虾夷扇贝稚贝的半致死浓度为2.3 g/L,安全浓度为0.23 g/L,高于现场使用的浓度0.1 g/L。慢性毒性实验显示,0.1~1.0 g/L的改性粘土对虾夷扇贝稚贝的存活率、壳长和壳高略有影响,但是影响不显著。对稚贝滤食率的研究发现,加入改性粘土会影响其摄食,并且随着改性粘土浓度的增高影响越明显。模拟养殖水体爆发藻华后喷洒改性粘土的实验表明,改性粘土在有效去除藻细胞,改善水体环境的同时,还能使虾夷扇贝稚贝的存活率从22%提高到38%。另外,如采用先改性粘土治理后投放稚贝的策略,稚贝的存活率大大提高,约是对照组的3倍。本文的实验结果说明采取适当的策略和适当用量的改性粘土即可有效去除有害藻华,也对虾夷扇贝稚贝之类的养殖生物无害甚至有益,是一种极具应用前景的藻华治理技术方法。
The acute and chronic effects of modified clays on juvenile Scallop shrimp Scylla serrata were studied, and the effects of modified clays on juvenile Scallop scallop juveniles were explored. The 96-h acute toxicity test showed that the semi-lethal concentration of modified clays was 2.3 g / L for juvenile Scirpus gotiatus, and the safe concentration was 0.23 g / L, which was higher than 0.1 g / L. Chronic toxicity tests showed that the survival rate, shell length and shell height of 0.1-1.0 g / L modified clay had a slight effect on the juvenile Scallop, but the effect was insignificant. Study on the filtration rate of juveniles found that adding modified clay will affect its feeding, and with the modified clay concentration increases the more obvious impact. Experiments on sprayed modified clay after algal blooms simulate aquaculture water show that the modified clay can improve the water environment and improve the survival rate of juvenile Scirpus brasiliensis from 22% to 38% while effectively removing algal cells. In addition, the survival rate of juveniles increased significantly, about 3 times that of the control group. The experimental results of this paper show that using suitable methods and proper amount of modified clay can effectively remove harmful algal blooms and also harmless and even beneficial to the cultured organisms such as scallop and scallop juveniles, which is a promising algae bloom Governance techniques and methods.