[Effect of water storage and aquaculture on Oncomelania hupensis control in tidal flats wetlands of islet-beach type area of Dantu section of lower reaches of Yangtze River].
OBJECTIVE
To evaluate the effect and the benefits of the projects of water storage and aquaculture on Oncomelania hupensis snail control in the tidal flats wetlands of islet-beach type area of lower reaches of the Yangtze River.


METHODS
The projects of water storage and aquaculture on 0. hupensis snail control were implemented in the tidal flats wetlands of islet-beach type of lower reaches of the Yangtze River. The breed situation of the snails was investigated by the conventional method before and after the project implementation and the effect of control and elimination of the snails by the projects were evaluated. At the same time, the cost-benefit analysis of two projects among them was performed by the static benefit-cost ratio method.


RESULTS
All of 0. hupensis snails were eliminated in the first year after the implementation of seven water storage and aquaculture projects. The costs of detection and control of snails saved by each project was 69.20 thousand yuan a year on average. The annual net benefits of the "Nanhao Group 10 beach" project and "Wutao Group 6-14 beach" project were 2 039.40 thousand yuan and 955.00 thousand yuan respectively, and the annual net benefit-cost ratios were 1.09: 1 and 1.07: 1 respectively.


CONCLUSIONS
The O. hupensis snails could be rapidly eliminated by the water storage and aquaculture, and the economic benefit is obvious, but the wetland ecological protection and flood control safety should be considered in the tidal flats wetlands of islet-beach type area of lower reaches of the Yangtze River.
Ye-fang
YF
Li
Yi-xin
YX
Huang
He-sheng
HS
Wang
De-rong
DR
Hang
Xiang-ping
XP
Chen
Yi-feng
YF
Xie
Lian-heng
LH
Zhang
D000818:Animals; D017756:Aquaculture / Q000191:economics / Q000379:methods*; D002417:Cattle; D002681:China; D003362:Cost-Benefit Analysis; D045483:Rivers / Q000737:chemistry; D012908:Snails / Q000254:growth & development*; D053833:Wetlands