岗更湖浮游生物调查及鱼产力评估

Plankton Community Structure and Productivity of Silver Carp and Bighead Carp in Ganggenghu Lake,in the Inner Mongolia Autonomous Region

2018年5月、7月和9月,参照《内陆水域渔业资源调查手册》,对内蒙古赤峰市克什克腾旗岗更湖的浮游生物进行了3次调查。共检测出浮游植物7门71种(属),包括绿藻门30种,硅藻门18种,蓝藻门14种,裸藻门4种,甲藻门2种,隐藻门2种和黄藻门1种。浮游植物平均密度为7882.43×10^4个/L,平均生物量为31.054 mg/L。岗更湖中共检测出浮游动物4大类34种,其中轮虫12种,原生动物9种,枝角类8种,桡足类5种。浮游动物平均密度为2947.5个/L,平均生物量为23.198 mg/L。浮游植物Margalef丰富度指数平均为1.077,Shannon-Wiener多样性指数平均为1.947,Pielou均匀度指数平均为0.466;浮游动物Margalef丰富度指数平均为1.992,Shannon-Wiener多样性指数平均为2.141,Pielou均匀度指数平均为0.552。由浮游生物种类、现存量和多样性指数判断岗更湖水体为超富营养型水体,由浮游生物饵料资源评估鱼产力为553.42 kg/hm^2。

Plankton community structure was surveyed in Ganggenghu Lake in Hexigten Qi,Chifeng City,Inner Mongolia Autonomous Region in May,July and September 2018 according to the handbook for investigation of fishery resources in inland waters.A total of seven phyla and 71 species(genera)of phytoplankton were found,including 30 species(genera)in Chlorophyta,18 species(genera)in Bacillariophyta,4 species(genera)in Cyanophyta,4 species(genera)in Euglenophyta,2 species(genera)in Cryptophyta,2 species(genera)in Pyrrophyta and 1 genus in Xanthophyta.There was average density of 7882.43×10^4 ind/L and biomass of 31.054 mg/L in phytoplankton.A total of 34 species(genera)of zooplankton were identified in Ganggeng Lake,including 12 species(genera)of rotifers,9 species of protozoa,8 species of cladocerans and 5 species of copepods,with average density of 2947.5 ind/L and biomass of 23.198 mg/L.There were average Margalef richness index of 1.077,average Shannon-Wiener diversity index of 1.947,and average phytoplankton of Pielou evenness index of 0.466 for phytoplankton.In zooplankton,there were average Margalef richness index of 1.992,Shannon-Wiener diversity index of 2.141 and average phytoplankton of Pielou evenness index of 0.552.The plankton species,biomass and diversity index indicated that the water in Ganggenghu Lake was super eutrophic,and that the productivity of silver carp(Hypophthalmichthys molitrix),and bighead carp(Aristichthys nobilis)was 553.42 kg/hm^2 based on the natural food resources of plankton in the lake.