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| Plankton Community Structure and Productivity of Silver Carp and Bighead Carp in Ganggenghu Lake, in the Inner Mongolia Autonomous Region |
| ZHOU Bobo1, YANG Zilong2, ZHANG Ziyuan1, LI Yichao1, SHAO Xudong1, BAI Lujun2, WANG Xinran2, LIU Qing1 |
1. Key Laboratory for Hydrobiology in Liaoning Province, Dalian Ocean University, Dalian 116023 China;
2. Chifeng Fishery Technology Workstation, Inner Mongolia Autonomous Region, Chifeng 024000, China |
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Abstract 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 7882.43×104 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/hm2 based on the natural food resources of plankton in the lake.
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Received: 10 May 2019
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