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1、水产养殖水质调控 1.6 Water quality control of aquaculture,1.6.1 Main factors affecting water qualityChemistry: 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 controlUse chemicals to control PH and toxic (有毒）gas.,1.6.2.2 Physical control 1.Improve bottom layer quality
2、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 Obse
3、rcation 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,The phenomenon that the water
4、shows evident color owing to the mass propagation of plant plankton is call water expression. It can be divided into the follow types according to its apperance （Table1-2）:,（3）Judge the water quality by its color and expression （Table1-3）根据水色、水华类型判断水质,2. transparency透明度 （1）Water transparency and the
5、 phytoplankton透明度与浮游植物的关系（2）Water transparency and the water fertility透明度与水体肥度（Table1-4）,3. Observation of water nutrition水体肥瘦与水质判别Iii Water fertility and the water quality: fertilized, circulating, fresh, cleanThe meaing of fertilized, circulating, fresh and clean in biology肥、活、嫩、爽,The good water i
6、n 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.（
7、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 plankto
8、n.(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 biologica
9、l standard of the water for fish cultivation in a fishermans eye: A.The quantity of plant plankton should be 20-100 milligram per liter.浮游植物量20100毫克/升 B.Many Flagellatae, few small-size blue algae.鞭毛藻类较多，小型蓝藻较少 C.The algae community in a growing period and no senescence of the cell.藻类种群处于增长期，细胞未老化 D
10、.Not too much suspended substance except plankton.浮游生物以外的其它悬浮物不过多,1.6.3.2 Regulation of Water Fertility水体肥度调控,The fertility of breeding water mainly depends on the quantity of phytoplankton; more phytoplankton means fertile,while less phytoplankton means poor. So the water named differently accordin
11、gly as fertile water, poor water, old water, and even good water (in terms of quality) . The regulation of water fertility for increasing species yield just obey the ground rules as follows.,1.Making poor water become fertile廋水变肥 Reasons for being poor:(1) lack of nutritional salt; (2)phytoplankton
12、has been intaken by zoonplankton. Water control: Add fertilizer(Organic or non-organic) or nutritional salt (nitrogen and phosphorus),2.Not letting fertile water become old肥水不老 In old water phytoplankton over multiply. And the water is lack of nutritive salt and light so photosynthesis cannot work p
13、roperly. Old water is the water in which phytoplankton cell becomes old. Water control: At around 10 am of sunny day, use （1PPM）CuSO4 to kill green algae. At around 5 pm, drain half of the pond and refill with new water.,3. Old becomes good老水转好 Good water must be fertile water, which means that ther
14、e are sufficient phytoplankton as primary producer to be eaten by raised animals and bait animals, in the meantime, they can offer oxygen to water. But fertile water doesnt equal to good water. Water control: When color turns dark green (with 25cm of transparency ), replace 1/3 of water in pond.,Discussion,Methods of water quality control.,Thank your listening,
