摘要
探讨次氯酸钙和二氯异氰尿酸钠两种代表性含氯消毒药物,为含氯消毒剂应用于细菌性虾病的防治提供理论依据。实验表明:有效氯在海水中的丧失随温度上升、pH值下降而加速。常见对虾病原菌对有效氯非常敏感,有机物增加、pH值上升使杀菌率下降。两种药物对实验中国对虾的48h半致死浓度为2.74～2.88mg/L有效氯。长期施以高于安全浓度的药物对实验虾之存活率、增长率等指标无不良影响,施药组发病率远远低于对照组。
This paper reports the studies on two representitive chlorinated disinfectants for bacterial diseases of prawn from the view of pharmacology.The results showed that the decrease rate of available chlorine in seawater rised with the increase of temperature,chemical oxygen de-mand(COD ),and with the decrease of pH.Some bacteria that most commonly cause prawn diseases were highly sensitive to chlorine.In the laboratory,0.125-1.0mg/L of available chlorine could kill 60%-99% of such bacteria.Under experimental conditions,48h medial lethal concentration to the cultural prawn Penaeus chinensis(9.0-1.0cm length)was about 2.74- 2.88mg/L of available chlorine The prawn dipped inro disinfectant solusion of 0.6-1.2mg/L of available chlorine for 21 days showed no obvious toxicity reaction,while the incidence of disease decreased obviouslv.
关键词
含氯
消毒剂
虾病
细菌
毒性
防治
Chlorinated disinfectant,diseases of prawn
bacteria
toxicity
