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目的在山丘地区观察密达利喷洒灭螺效果及对鱼类的毒性。方法选择钉螺孳生的山丘地区苗木地为灭螺试验现场,分为密达利试验组、氯硝柳胺乙醇胺盐对照组和空白对照组,观察灭螺效果;选择3口体积相同的水塘为鱼毒试验现场,分为密达利高、低浓度试验组和清水对照组进行鱼类毒性试验比较。结果施药后3、7、15 d,密达利组活螺平均密度为0.49、0.42、0.17只/0.1 m2,氯硝柳胺乙醇胺盐组为0.90、0.60、0.15只/0.1 m2,空白对照组为5.40、9.05、3.90只/0.1 m2,3、7、15 d时,活螺密度下降率密达利组为85.92%、50.55%和87.93%,氯硝柳胺乙醇胺盐组为67.03%、95.11%和91.76%,两组活螺平均密度下降率差异无统计学意义(P>0.05);施药后3,7 d和15 d,密达利组钉螺校正死亡率分别为89.76%、87.98%和94.10%,氯硝柳胺乙醇胺盐组为89.70%、83.22%和94.72%,空白对照组为9.24%、9.50%和15.21%,密达利组与氯硝柳胺乙醇胺盐组差异无统计学意义(P>0.05),与空白对照组差异有统计学意义(P<0.05)。密达利高、低浓度试验组和清水对照组鱼类死亡率均为0。结论山丘地区旱地使用密达利在短期内具有较好的杀螺效果,对鱼类低毒。
Objective To observe the effect of snail mimicry and the toxicity to fish in the hills. Methods The snail breeding hillside seedlings were selected as the snail test site. The snail was divided into four groups: meclizan, niclosamide ethanolamine salt and control group, and the snail control effect was observed. Three ponds with the same volume were chosen For the fish poisoning test site, divided into high, low concentration test group and fresh water control group fish toxicity test comparison. Results The average density of live snails in meridalis group was 0.49, 0.42 and 0.17 only /0.1 m2 at 3, 7 and 15 days after administration, respectively. The niclosamide ethanolamine salt group was 0.90, 0.60 and 0.15 /0.1 m2. The blank control When the group was 5.40,9.05,3.90 /0.1 m2,3,7,15 d, the densities of living spiral densities were 85.92%, 50.55% and 87.93% in the metronidazole group, 67.03% in the niclosamide ethanolamine group, 95.11% and 91.76%, respectively. There was no significant difference in the mean density drop of live snails between the two groups (P> 0.05). On the 3rd, 7th and 15th day after administration, the corrected mortality of snail in the mesalamine group was 89.76%, 87.98 %, And 94.10% respectively. The niclosamide ethanolamine group was 89.70%, 83.22% and 94.72%, while the control group was 9.24%, 9.50% and 15.21% respectively. There was no statistical difference between the mesaplytin and niclosamide ethanolamine groups Significance (P> 0.05), and the difference between the control group was statistically significant (P <0.05). Mildar, low concentration of the experimental group and freshwater control group fish mortality were 0. Conclusion The use of memidine in dryland in the hills has a good snail killing effect in short term and low toxicity to fish.