水產(chǎn)養(yǎng)殖水質(zhì)調(diào)控ppt課件-免費(fèi)閱讀
【正文】 s 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 anic matter quantity, some according to the amount of plankton. ? But in a fisherman39。s 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 fisherman39。s eye is high summarize as the four words. This is much more prehensive than only judge the water by its color. ? However, there actually has an concept of biological meaning of the four words. It39。s eye: quantity of plant plankton should be 20100 milligram per 20－ 100毫克 /升 Flagellatae, few smallsize blue 毛藻類較多，小型藍(lán)藻較少
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