The acute toxic effect of the pesticide cypermethrin to Daphnia magna HB was examined. D. magna HB was exposed to cypermethrin at concentrations of 0, 1, 3, 5, 7, and 9 mg/L for 24 h. Data showed that the 24 h-LC 5...The acute toxic effect of the pesticide cypermethrin to Daphnia magna HB was examined. D. magna HB was exposed to cypermethrin at concentrations of 0, 1, 3, 5, 7, and 9 mg/L for 24 h. Data showed that the 24 h-LC 50 of cypermthrin on D. magna HB was 4.81 mg/L. In contrast, the 24 h-LC 50 of K 2Cr 2O 7(the national standard toxicant) to Daphnia magna was 0.38 mg/L in the current study. Results indicated that the Daphnia magna was very sensitive to pesticides. In addition, the effects of the culture condition(such as hardness, temperature and DO etc.) on Daphnia magna HB was also studied.展开更多
本文介绍了夏季在武汉鱼池所采的耐高温大型溞(Daphnia magna HB),对其生长繁殖及其实验室条件下溞的种群密度、食物、温度和光照强度对生长、发育的影响,并对其培养和保种方法进行了研究。连续3年实验室的培养表明,在以新鲜藻类为食物...本文介绍了夏季在武汉鱼池所采的耐高温大型溞(Daphnia magna HB),对其生长繁殖及其实验室条件下溞的种群密度、食物、温度和光照强度对生长、发育的影响,并对其培养和保种方法进行了研究。连续3年实验室的培养表明,在以新鲜藻类为食物的情况下,此种溢在15—31℃时能正常生长、繁殖。在31℃时,其最大体长为3.65mm,最高怀卵量为26个。根据国际标准法组织所介绍的(ISO 6341)对标准毒物——重铬酸钾的敏感性试验,24hEC_(50)为0.92mg/L(20%)。展开更多
文摘The acute toxic effect of the pesticide cypermethrin to Daphnia magna HB was examined. D. magna HB was exposed to cypermethrin at concentrations of 0, 1, 3, 5, 7, and 9 mg/L for 24 h. Data showed that the 24 h-LC 50 of cypermthrin on D. magna HB was 4.81 mg/L. In contrast, the 24 h-LC 50 of K 2Cr 2O 7(the national standard toxicant) to Daphnia magna was 0.38 mg/L in the current study. Results indicated that the Daphnia magna was very sensitive to pesticides. In addition, the effects of the culture condition(such as hardness, temperature and DO etc.) on Daphnia magna HB was also studied.
文摘本文介绍了夏季在武汉鱼池所采的耐高温大型溞(Daphnia magna HB),对其生长繁殖及其实验室条件下溞的种群密度、食物、温度和光照强度对生长、发育的影响,并对其培养和保种方法进行了研究。连续3年实验室的培养表明,在以新鲜藻类为食物的情况下,此种溢在15—31℃时能正常生长、繁殖。在31℃时,其最大体长为3.65mm,最高怀卵量为26个。根据国际标准法组织所介绍的(ISO 6341)对标准毒物——重铬酸钾的敏感性试验,24hEC_(50)为0.92mg/L(20%)。
