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三、污水池塘的生物学基础作为鱼类饵料基础的浮游生物,在污水养鱼塘的种类和数量及季节变化,常常受到污水施肥和季节的影响较为明显。但是这些发展和变化仍有其一定的基本规律,既有一般池塘的基本规律,也有污水养鱼池所特有的现象。为此有必要对污水池塘的饵料基础作一阐明,并适当评介污水池塘的饵料状况,为鱼类生长、池塘鱼产量提供依据。(一)污水养鱼塘浮游生物的种群组成:
Third, the biological basis of sewage ponds As plankton for fish bait based on the type and quantity of septic tanks and seasonal changes, often affected by the impact of sewage fertilization and the more obvious seasons. However, these developments and changes still have some basic rules, which are not only the basic rules of ordinary ponds but also those peculiar to sewage ponds. Therefore, it is necessary to clarify the bait foundation of sewage ponds and to properly assess the feedstuff conditions of sewage ponds to provide basis for fish growth and pond fish production. (A) sewage ponds plankton population composition: