养鱼池轮虫休眠卵分布和萌发的研究
ON THE DISTRIBUTION AND HATCHING OF RESTING EGGS OF ROTIFER IN FISHPONDS
-
摘要: 东北地区部分鱼场养鱼池底泥中轮虫的休眠卵,表层(0—5厘米)数量每平方米为1.2—503万个,个别池塘高达1,573万个,其中完全暴露于泥表面的数量约占1—2%。休眠卵数量差别和池塘环境条件关系密切;各泥层中的轮虫休眠卵数量呈“V”形垂直分布的趋势。萼花臂尾轮虫和角突臂尾轮虫的休眠卵在水温10—40℃;pH4.5—11.5;溶氧0.3毫克/升以上和盐度8.5%以下的条件下可以萌发。10℃为其发育的生物学零度。根据轮虫休眠卵分布和它的环境条件的关系,以及萌发的生态条件,阐述了在养鱼池中增殖轮虫所应采取的措施及其理论根据。Abstract: This paper embodies the results of field surveys on the abundance and distribution of the resting eggs of rotifer in fishponds and the experimental investigations on the effects of some external or internal factors on the hatching of the eggs.The number of the resting eggs in the upper 5 cm depths of the bottom mud in the fishponds is estimated at twelve thousands to five millions per square meter, of which only about 1—2% lie on the free surface. The eggs may normally be incubated under such conditions where water temperature being 10—40℃, pH value 4.5—11.5, salinity less than 8.5‰ and the O2 content above 0.3 mg/l.The relationship between the number of rotifer population and their resting eggs and the ways to increase the abundance of rotifer in fishponds are discussed.
-
Keywords:
- Rotifer
-
计量
- 文章访问数: 867
- HTML全文浏览量: 1
- PDF下载量: 418
下载: