水产养殖水质调控2演示幻灯片.ppt

水产养殖水质调控 1.6 Water quality control of aquaculture;1.6.1 Main factors affecting water quality Chemistry: 工业，农业，人为活动 Biology: D.O，PH ;1.6.2Methos of water quality control 养殖水体水质调控方法 1.6.2.1Chemical control Use chemicals to control PH and toxic (有毒）gas. ;1.6.2.2 Physical control 1.Improve bottom layer quality 改善底质 2.Water resource treatment 水源处理 3.Water exchange or refill 更换或补充新水 ;1.6.2.3 Biological control生物控制 1、Increse useful zoonplankton through artificial culture. 2、Microecologics微生态制剂 3、Photosynthetic bacteria光合细菌 4、Higher aquatic plants水生植物 ;1.6.3 Biological control of water quality 养殖水体水质生物调控措施 1.6.3.1 Obsercation of color and transparency水色和透明度观察——“看水” The fisherman observe the pond water mainly about渔民看水主要依据 1. water color (water expression)水色(水华) ;（1）The relationship between water color and plant plankton （Table1-1） ;（2）Water color (water expression) in rich water肥水“水华”类型;Type of water expression ;（3）Judge the water quality by its color and expression （Table1-3）根据水色、水华类型判断水质;The good water in fishermans eye is high summarize as the four words. This is much more comprehensive than only judge the water by its color. However, there actually has an concept of biological meaning of the four words. Its quite essential to make this clear by test the species and quantity of the plant plankton. （1）Fertility. The concept of fertile water is not unified now. some according to the nutritive saltsand and dissolved organic matter quantity, some according to the amount of plankton. But in a fishermans eye, the sign of fertile water is the rich color of it, which means the quantity of plant plankton. (2) circulating means there are changes of water color and transparency (3) fresh means the water is fertilize and vigorous. (4) clean the premise is fresh, which means the plant plankton is growing, and the same time there is few other suspendedsolids like mud in the water. ;we can see the biological standard of the water for fish cultivation in a fishe