研究了pH、盐度对茂名海域文昌鱼的急性毒性，在水温（25±1）℃条件下，找出了文昌鱼在高低pH和高低盐度水体中96 h LC50分别为：pH为5和10；盐度为17．5‰和47．5‰。pH和盐度对文昌鱼出砂率和死亡率的影响均呈典型的V字型，影响的方程为二项式方程。文昌鱼出砂率和死亡率与pH值和盐度变化均为高度相关（r＞0．8）。随时间延长，文昌鱼活力降低，体色加深，出砂和死亡数增多。%This experiment was conducted to study The acute toxicity of pH and salinity on the Bran-chiostoma belcheri .To find the 96 h LC50 of Branchiostoma belcheri in the water of pH and salinity . The results showed that the limit of Branchiostoma belcheri in the water of pH and salinity .In the pH water the 96 h LC50 is 5 and 10 ;and in the salinity the 96 h LC50 is 17 .5‰ and 47 .5‰ .The influ-ence of pH and salinity to the rate of out of sand and death rate is V .T he effect of equation is binomi-al equation .The rate of out of sand with the change of salinity and the death rate with the change of salinity are height (r>0 .8) .The lively of Branchiostoma belcheri got much lower ,their colour got darken ,and the Branchiostoma belcheri got out of sand and death more and more .
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