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目的观察湖区拦网防止钉螺扩散效果。方法选择江苏省金湖县高邮湖施尖滩养殖围网水域为试验现场;按照中层取水防螺原理设置湖区拦螺网,同时以普通围网为对照;分别以长5、10、20cm标记芦苇杆和稻壳为模拟漂浮物,在拦网前50m处投放30min后分别观察并计数不同大小标记漂浮物通过拦网和围网的数量。调查湖区养殖围网、钉螺及历史钉螺分布情况,分析养殖围网的防螺作用。结果湖区拦螺网对不同大小标记漂浮物的拦截率均为100%;普通围网对不同大小标记芦苇杆的拦截率也为100%,对稻壳的拦截率为89.50%。近年出现扩散钉螺湖滩濒湖侧均无养殖围网,而有养殖围网的历史有螺湖滩均未出现扩散钉螺。结论湖区拦螺网可有效防止钉螺漂流登陆湖滩扩散,该技术可作为南水北调东线工程防螺技术储备,也可结合水产养殖网的设置防止湖区钉螺扩散。
Objective To observe the effect of blocking the snail in the lake to prevent the snail from spreading. Methods The waters of the sewerage fence in Gaotian Lake, Gaoyu, Jinhu County, Jiangsu Province were chosen as the experimental site. The water-saving and snail-proofing principle was used to set the interception net in the lake area, while the ordinary seine net was used as the control. Reed Rods and rice husks were simulated floats. After being placed for 30 min at the front of the block, the number of blocks and fences of different sizes, respectively, were observed and counted. To investigate the distribution of fencing, snail and history snail in the lake area and analyze the anti-spiral effect of breeding seine. Results The intercepting rate of the block fence in the lake area for all sizes of floating debris was 100%. The common intercepting fence intercepted 100% of the reeds with different sizes and 89.50% of the rice husk. In recent years, there has been no proliferation of snail lake beach near the lake without breeding seine, and the history of breeding seine lake have no occurrence of Spiraea diffusion snail. CONCLUSION: The snail net in the lake area can effectively prevent the spread of snail rafting lakes and lakes, which can be used as the reserve of anti-spiral technology in the east route of South-to-North Water Diversion Project. It can also be used to prevent snail spread in the lake area in combination with the aquaculture net setting.