Composition of plankton in water areas in Gialam district of Hanoi

Abstract

A survey was carried out to determine composition of plankton in water areas in Gialam district of Hanoi. Water samples were taken from 5 ponds and lakes and 5 low-lying fields in Gialam district at 3 different times of the day  every week to assess physical and chemical parameters and plankton composition.  Some parameters  were found to be good for growth of aquatic species, except temprature, COD, total iron and H₂S. The plankton composition was rich in species with 36 zooplankton species in 13 families and 3 groups (Copepoda, Cladocera and Rotatoria) and 28 phytoplankton species in 12 families and 4 groups (Cyanobacteria, Chlorophyta, Bacillariophyta and Euglenophyta).  There were significant differences in plankton species between ponds/lakes and low-lying fields. The density and biomass of zooplankton were low and  higher in ponds or lakes  than  in low-lying fields