单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,*,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,1.6.3 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),（2）Water color(water expression)in rich water,肥水“水华”类型,The phenomenon that the water 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）,:,Type of water expression,Water appearance,The composition of algae,Water evaluation,solution,non-flagellate,even and stable,stable water,cloudiness,flagellate,light-and shade,good water but with the danger of going bad,membranaceous,blue algae,with,simulated,vacuole,covered the water surface,Good and bad are all possible,2.,transparency,透明度,（1）Water transparency and the 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 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.,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 accordingly 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 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 properly.Old water is the water in which phytoplankton cell becomes old.,Water control:At around 10 am of sunny day,use（1PPM）CuSO,4,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 there 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.,