Study on the uptake of dissolved nitrogen by Oocystis borgei in prawn (Litopenaeus vannamei) aquaculture ponds and establishment of uptake model

The increase of ammonia nitrogen, nitrite, nitrate, urea, and other dissolved nitrogen in prawn pond often causes eutrophication of water body and prawn poisoning, which brings great harm to aquaculture. Microalgae are the main biological factors in prawn pond, which can effectively utilize dissolve...

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Bibliographic Details
Published in:Aquaculture international 2020-08, Vol.28 (4), p.1445-1458
Main Authors: Liu, Mei, Huang, Xiang-Hu, Li, Chang-Ling, Gu, Binhe
Format: Article
Language:English
Subjects:
Algae
Ammonia
Ammonium
Ammonium compounds
Aquaculture
Biomedical and Life Sciences
Environmental conditions
Environmental factors
Eutrophication
Freshwater & Marine Ecology
Freshwater crustaceans
Life Sciences
Light intensity
Litopenaeus vannamei
Marine crustaceans
Nitrates
Nitrites
Nitrogen
Nitrogen isotopes
Oocystis borgei
Phytoplankton
Ponds
Salinity
Temperature
Uptake
Urea
Water bodies
Zoology
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Summary:The increase of ammonia nitrogen, nitrite, nitrate, urea, and other dissolved nitrogen in prawn pond often causes eutrophication of water body and prawn poisoning, which brings great harm to aquaculture. Microalgae are the main biological factors in prawn pond, which can effectively utilize dissolved nitrogen. The goal of this study was to evaluate the effects of the forms and concentrations of various dissolved nitrogen on the uptake rate ( ρ ) by Oocystis borgei , and establish the relationship model between ammonia nitrogen uptake rate and key environmental factors using 15 N isotope labeling technique. Temperature ( A ), light intensity ( B ), salinity ( C ), pH ( D ), and algal concentration ( E ) were the factors used to construct an empirical model. Study results showed that nitrogen concentrations had a significant effect on the uptake rates of ammonium, nitrate, nitrite, and urea ( P <  0.05). Under various salinity and temperature conditions, the relative preference index (RPI) of ammonium was greater than that of nitrite, urea, and nitrate; Ammonium was the preferred nitrogen source for O. borgei. The optimal combination of environmental conditions for ρ (NH 4 + -N) was temperature of 20 °C, pH of 7.5, light intensity of 81 μmol m −2  s −1 , salinity of 15‰, and algal concentration of 5.5 × 10 8  cell L −1 . The model equation was ρ  = 0.0017 × ( A 0.180 B 0.252 C 0.748 D 0.587 E ) + 0.0512, with the coefficient of determination ( R 2 ) of 0.89. No significant difference was observed between the model-predicted values and the measured values ( F =  0.789, P  > 0.05), which demonstrated the high fitting degree of simulation equation. This study provides valuable insight into the removal of dissolved nitrogen in a controllable prawn farming mode such as high-elevation ponds by O. borgei .
ISSN:0967-6120
1573-143X
DOI:10.1007/s10499-020-00534-z