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研究了有益微生物对海水虾池浮游生物生态特征的影响。通过对虾养殖系统中浮游动物与浮游植物进行为期3个月的监测,结果表明试验组虾池的浮游植物密度表现为前期低,中期迅速增长,后期达顶峰,并维持在70×106～160×106cell·L-1的水平,前期种类以硅藻类为主,后期则以绿藻类为主;同时试验池浮游动物的密度也保持稳定增长态势,并在养殖后期维持在顶峰水平,密度达到25×103～30×103ind·m-3,种类以广盐、适低盐的沿岸种为主,但优势种明显;对照池的浮游植物和浮游动物呈现前期低后期高的态势。其变化差异表现为对照组的浮游植物和浮游动物在后期的密度变动起伏较大,且出现较大比例的有害的兰藻类,而试验池的兰藻类只占较少的比例,说明芽孢杆菌群能抑制兰藻类的繁殖,促进有益藻类生长;浮游生物的多样性指数较低,低于自然海区,但种类均匀度则较高,与自然海区相当。
The effects of beneficial microorganisms on the ecological characteristics of plankton in seawater shrimp ponds were studied. The results of three-month monitoring of zooplankton and phytoplankton in the shrimp farming system showed that the density of phytoplankton in the shrimp ponds in the experimental group showed a rapid increase in the early and mid-term and reached a peak in the later period and remained at 70 × 106-160 × The concentration of 106cell L-1 was dominated by diatoms in the early stage and mainly by the green algae in the late stage. Meanwhile, the density of zooplankton in the test ponds also maintained a steady growth and remained at the peak level during the later culture, with a density of 25 × 103 ~ 30 × 103ind · m-3, and the species are mainly salt and low salinity. However, the dominant species are obvious. The phytoplankton and zooplankton in the control pond are in the low-late high stage. The difference of the variation showed that the density and density of phytoplankton and zooplankton in the control group fluctuated greatly in the later period, and a large proportion of harmful blue algae appeared, while the blue algae in the experimental pond accounted for only a small proportion, indicating that the Bacillus group Can inhibit the reproduction of blue algae and promote the growth of beneficial algae. The diversity index of plankton is lower than that of natural sea, but the species evenness is higher, which is similar to natural sea area.