[Molluscicidal effects of nano-silver biological molluscicide and niclosamide].
OBJECTIVE
To evaluate the molluscicidal effect of a novel nano-silver biological molluscicide in the field and its toxicity to other aquatic organisms.


METHODS
A marshland of the Qiupu River was selected as the study site. Four 1 m3 pools were excavated. Four groups, including 300 g/m3 and 600 g/m3 nano-silver biological molluscicide groups, a 2 g/m3 50% niclosamide group, and a natural water (control) group were assigned to the four pools which had 100 Oncomelania hupensis snails and 100 crucian seedlings. The molluscicidal effects and toxicity to the aquatic organisms were observed.


RESULTS
The snail death rates were 100% and crucian seedling death rates were 6% in the 600 g/m3 nano-silver biological molluscicide group and 300 g/m3 nano-silver biological molluscicide group in 7 days and 14 days. The snail death rate was 100% in the niclosamide group in 7 days, and the crucian seedling death rate was 100% in the niclosamide group in 3 days. The snail death rates were 7% and 14% in the control group in 7 and 14 days respectively, and the crucian seedling death rate was 22% in the control group.


CONCLUSIONS
The novel nano-silver biological molluscicide possesses an excellent molluscicidal capability and non-toxicity to the other aquatic organisms. Therefore, it may become a new, efficient and environment-friendly bio-molluscicide for extensive application.
Department of Chizhou Vocational Technical College, Chizhou 247100, Anhui Province, China.
Xiao-yuan
XY
Guang
Chemistry and Materials Engineering of Chizhou University, China.
Jiang-jie
JJ
Wang
Guichi District Station of Schistosomiasis Control, Chizhou City, Anhui Province, China.
Zong-gui
ZG
He
Guichi District Station of Schistosomiasis Control, Chizhou City, Anhui Province, China.
Geng-xin
GX
Chen
Chemistry and Materials Engineering of Chizhou University, China.
Lei
L
Ding
Guichi District Station of Schistosomiasis Control, Chizhou City, Anhui Province, China.
Jian-jun
JJ
Dai
Chemistry and Materials Engineering of Chizhou University, China.
Xiao-hong
XH
Yang
D000818:Animals; D002347:Carps; D053768:Metal Nanoparticles; D008975:Molluscacides / Q000494:pharmacology* / Q000633:toxicity; D009534:Niclosamide / Q000494:pharmacology*; D012834:Silver / Q000494:pharmacology*; D012908:Snails / Q000187:drug effects*
D008975:Molluscacides; D012834:Silver; D009534:Niclosamide