Effect of Silver Carp and Bighead Carp Cultured in Net Cage on Water Eutrophication in Lake Hailing
In order to evaluate the impact of cage culture of silver carp and bighead carp on the eutrophica-tion of Hailing Lake water,the water quality,phytoplankton,zooplankton and bottom of Hailing Lake were mea-sured in December 2022,March,July and October 2023.The main research results were as follows:The temper-ature,pH,chlorophyll a content and transparency of Hailing Lake in the four seasons of the year vary within the range of 3-37℃,8.17-9.09,4.1-80.0 mg/L and 0.24-1.40 m respectively.Ammonia nitrogen,The variation ranges of nitrite nitrogen,total phosphorus and total nitrogen were 0.010 0-0.923 5 mg/L,0.003 1-0.050 2 mg/L,0.033-0.306 mg/L and 0.900-3.244 mg/L respectively.The total phosphorus and total nitrogen contents are both at the level of Class Ⅳ and Class Ⅴ water in summer and autumn.A total of 6 phytoplankton phyla and 49 genera were collected in autumn.The range of phytoplankton cell density and biomass in Hailing Lake in autumn is 9.21×106-34.61×106 ind./L and 0.91-2.17 mg/L.Among them,the density and biomass of cyanobacteria were the volume is significantly higher than other categories.In autumn,a total of 3 orders and 7 genera of zooplankton were detected,including 1 genus of protozoa,2 genera of rotifers,4 genera of cladocerans,and 3 orders of cope-pods.The range of zooplankton density and biomass in Hailing Lake in autumn was 935.2-1 964.5 ind./L and 0.105-0.198 mg/L.A total of 4 species of benthic organisms were collected in autumn.The density and biomass of benthic organisms in Hailing Lake in autumn ranged from 69.5-103.8 ind./m2 and 0.225-0.369 g/m2.The above research results show that raising silver carp and bighead carp in cages in breeding areas can effectively control the chlorophyll a content in the water body,and improving the transparency of the water body has a certain puri-fication effect on the water quality.The filter-feeding effect of silver carp and bighead carp can effectively control the abundance of phytoplankton in Hailing Lake and reduce the risk of cyanobacteria blooms.
Hailing LakeSilver carp and bighead carpEutrophicationPlanktonWater quality indicators
万方数据
维普
