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

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Abstract

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 15N 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(NH4+-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 × 108 cell L−1. The model equation wasρ = 0.0017 × (A0.180B0.252C0.748D0.587E) + 0.0512, with the coefficient of determination (R2) 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.

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Funding

Authors are grateful to the Research and Demonstration of Key Technologies in the Industrialization of Active Microalgae Products (KY 20180112), which is funded by Shenzhen Dapeng New Area industry Development Special.

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Correspondence to Xiang-Hu Huang or Chang-Ling Li.

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Liu, M., Huang, XH., Li, CL. et al. Study on the uptake of dissolved nitrogen by Oocystis borgei in prawn (Litopenaeus vannamei) aquaculture ponds and establishment of uptake model. Aquacult Int 28, 1445–1458 (2020). https://doi.org/10.1007/s10499-020-00534-z

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  • DOI: https://doi.org/10.1007/s10499-020-00534-z

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