Investigation and evaluation of plankton resources and estimation of fish productivity of Doushan Reservoir
DING Yuting
ZHOU Yanfeng
ZHANG Xizhao
ZHOU Yifan
GUO Shiyue
XUE Junjian
YIN Fangkai
YOU Yang
Abstract：The plankton resources,water nutritional status and fish productivity of Doushan Reservoir were investigated,analyzed and evaluated during the dry and wet periods from 2020 to 2021.A total of 45 species(including variants)of 8 phyla of phytoplankton,mainly green algae,diatoms and cyanobac-teria;and 33 species of zooplankton,mainly protozoa and rotifers were identified.The analysis of com-munity characteristics showed that the density and biomass of diatoms accounted for more than 85％in the dry period and the algae phase was diatoms type;the density and biomass of Cyanophyta accounted for more than 70％in the wet period and the algae phase was cyanophyte and cryptophyte type;the protozoan density accounted for more than 61％in the two periods,the rotifer biomass accounted for more than 76％and the small zooplankton accounted for a relatively high proportion.The nutritional type of the water was moderate to mild eutrophicated,and the pollution level was moderate to heavy polluted.CCA analysis showed that the main environmental impact factors of plankton were SD,DTN,TN and CODMn.According to the estimation of bait biology method,the fish productivity provided by plankton was 308.29 kg/hm2.These findings are relatively complete records of the current status of a-quatic biological resources and their water environment nutrition,which should aid to providing a nec-essary reference for the subsequent maintenance of the water environment of Doushan Reservoir and the ecological management of fishery.
Keywords：Doushan Reservoirplanktonnutritional status of waterfish production
Publication Date：2024-10-28
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：9( 162-170 )