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在池塘中直接增殖轮虫,是解决鱼苗开口饵料、降低生产成本、提高鱼苗成活率和质量的有效途径。现将其技术操作要点介绍如下:1.排水清塘轮虫是依靠底泥中的休眠卵重新萌发的。据测定,在养鱼的肥水塘的底泥中,平均每平方米有轮虫休眠卵几百万至1000多万个,它们是翌年轮虫萌发的“种子”。排水能增加底泥中休眠卵的受热量,清塘可清除轮虫的敌害,更换新水本身对休眠卵是一个良性刺激。所以,在平均水温20～25℃时,每667 m2用生石灰100 kg左右排水清塘,经8～10
The direct propagation of rotifers in ponds is an effective way to solve the problem of fish feed openings, reduce production costs and improve the survival rate and quality of fry. The technical operation is now introduced as follows: 1. Drainage pond rotifers rely on dormancy eggs in the re-germination of eggs. It has been determined that in the sediments of fish-breeding ponds, on average, there are between 1 and 10 million resting eggs per square meter of rotifer, which are the “seeds” of rotifer germination the following year. Drainage can increase the amount of heat in the dormancy eggs in the sediment. Clear ponds can eliminate the predators of rotifers. The replacement of fresh water itself is a benign stimulus for resting eggs. Therefore, when the average water temperature is 20 ~ 25 ℃, about 100 kg of lime is drained for every 667 m2,