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Article
Author(s)
Nguyen Van Hoa, Tran Suong Ngoc and Dao To Nhi
Full-Text PDF XML 724 Views
DOI:10.17265/2162-5263/2019.01.003
Affiliation(s)
College of Aquaculture and Fisheries, Can Tho University, Cantho 900000, Vietnam
ABSTRACT
To study an application of low-value
fishmeal (i.e. organic manure) and the effect
of different nitrogen (N) and phosphorus (P) ratios (N/Ps) to the composition
of algae prevailing in fertilized ponds for culturing Artemia. Phytoplankton composition and their abundance were determined
through qualitative and quantitative sampling and analyses. The experiment included five treatments, control treatment
using chicken manure (300 g/m3), the others with fishmeal in different
rates (i.e. 30 g/m3, 60 g/m3, 90 g/m3, 120 g/m3)
with 3 replicates each and in a combination with inorganic fertilizer. Result indicated
that the algal density of the experiment varied
from 318 × 103 to 2,590 × 103 cells/mL and a significant difference among treatments (p < 0.05).
The density of algae at the second treatment (30 g/m3) is the highest with a mean density
of 2,590 × 103 cells/mL. There are 38 phytoplankton
species belonging to five phyla of algae, i.e. Bacillariophyta, Cyanophyta, Chlorophyta, Dinophyta and Euglenophyta.
Also, there are 18 species of Bacillariophyta, 14 species of Chlorophyta, 4 species of Cyanophyta, 1 species of Dinophyta and 1 species of Euglenophyta. Algae compositions were 32, 34, 31, 27 species
at control treatment, and 30 g/m3, 60 g/m3, 90 g/m3,
120 g/m3 fishmeal treatments, respectively. The dominant genus was usually Nitzschia, Thalassiosira, Navicula (Bacillariophyta), Tetraselmis (Chlorophyta), Oscillatoria (Cyanophyta), Euglena (Euglenophyta). Euglena usually appeared in the late
phase of the experiment.
KEYWORDS
Fishmeal, phytoplankton, fertilizer pond.
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