小三毛金藻对盐碱土池塘毒害鱼类的防治研究

小三毛金藻（PrymnesiumparvumCarter）是一种有害藻类。通过以硫酸盐为主的盐碱土池塘的对照试验，总结出采用不同药物、黄泥土、酸性化肥和追施有机肥、提高池塘肥力、促使其它藻类大量繁殖；同时不定期进行水质分析、加注新水、降低盐度、调节pH值等防治措施，使小三毛金藻得到有效的控制。其防治效率达95％以上。自1985年在陕西省大荔、合阳引用这种防治技术到1997年使万亩盐碱地池塘养鱼水面未受到小三毛金藻大的危害。

PREVENTION AND CURE OF PRYMNESIUM PARVUM CARTE FROM POISONG FISH IN THE SALINE-ALKAI PONDS

The Prymnesium parvum Carter is a kind of poisonous alga. In the present paper,some comparative experiments have been conducted mainly in the saline-alkali ponds rich in sulphates,and the following results have been concluded,that is,the breeding of other algae can be enhanced by increasing the pond fertility through applying different medicine,yellow soil,acid fertilizer and topdressing some organic fertilizer;and thus the Prymnesium parvum Carter can be controlled effectively by nonperiodically analysing the water quality,adding fresh water,lowering salinity and adjusting pH value. Through using aforementioned measures,the success rate of the prevention and cure is more than 95%. More than 10000 mu saline-alkali fish ponds were exempt from the poisoning of the Prymnesium parvum Carter from 1985 to 1997 in Dan and Heyang counties where the aforementioned measures were used.