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Effects of carbon to nitrogen ratio (C:N) on water quality and growth performance of Litopenaeus vannamei (Boone, 1931) in the biofloc system with a salinity of 5‰

View ORCID ProfileHai-Hong Huang, Chao-Yun Li, Tao Liang, Yan-Ju Lei, Pin-Hong Yang
doi: https://doi.org/10.1101/2021.12.28.474292
Hai-Hong Huang
aCollege of life and environmental sciences, Hunan University of Arts and Science, Changde Hunan 415000, China
cHunan Provincial Collaborative Innovation Center for Efficient and Health Production of Fisheries, Changde Hunan 415000, China
dHunan Provincial Key Laboratory for Health Aquaculture and Product Processing in Dongting Lake Area, Changde Hunan 415000, China
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  • For correspondence: shinkanh@nwsuaf.edu.cn shinkanh@huas.edu.cn
Chao-Yun Li
bShandong Vocational Animal Science and Veterinary College, Weifang Shandong 261061, China
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Tao Liang
aCollege of life and environmental sciences, Hunan University of Arts and Science, Changde Hunan 415000, China
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Yan-Ju Lei
aCollege of life and environmental sciences, Hunan University of Arts and Science, Changde Hunan 415000, China
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Pin-Hong Yang
aCollege of life and environmental sciences, Hunan University of Arts and Science, Changde Hunan 415000, China
eHunan Engineering Research Center of Aquatic Organism Resources and Environmental Ecology, Changde Hunan 415000, China
fHunan Provincial Key Laboratory for Molecular Immunity Technology of Aquatic Animal Diseases, Changde Hunan 415000, China
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Abstract

This study aimed to investigate the effects of carbon to nitrogen ratio (C:N) on the water quality and shrimp growth performance during the grow-out culture of Litopenaeus vannamei in the biofloc system under a low salinity condition. Three biofloc treatments with an C:N (contained in the inputted feed and carbon source with the assumption that 75% of the feed nitrogen is excreted) of 8:1 (CN8), 16:1 (CN16) and 24:1 (CN24), respectively, were designed to stocking shrimp juveniles (~ 0.8 g) at a density of 270 individuals m-3, for a 63-days culture experiment at a salinity of about 5‰. Results showed that in CN8 treatment, the levels of pH (6.9±0.1), carbonate alkalinity (104.0±2.8mg L-1 CaCO3), biofloc volume (4.8±0.9mL L-1) and TSS (327.4±24.4mg L-1) were significantly lower than those in the other two treatments (≥7.6±0.3, ≥157.6±21.6mg L-1 CaCO3, ≥24.1±3.7mL L-1 and ≥508.1±32.3mg L-1, P<0.05); whereas the levels of TAN (7.1±0.9mg L-1), nitrite (14.0±3.6mg L-1) and nitrate (77.0±5.0mg L-1) were significantly higher than those in the other treatments (≤2.0±0.6mg L-1, ≤4.9±3.1mg L-1 and ≤14.7±5.9mg L-1, P<0.05). The zootechnical parameters of shrimp were not significantly different between three treatments (P>0.05), except that the survival rates in CN16 treatment (96.8±2.0%) and CN24 treatment (93.7±4.2%) were significantly higher than that of CN8 treatment (81.5±6.4%, P<0.05). The results indicated that an inputted C:N higher than 16:1 was suitable for the biofloc system with a low salinity of 5‰, with an optimal inferred C:N range of 18.5-21.0:1 for water quality and growth performance.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • ↵† Co-first author.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 31, 2021.
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Effects of carbon to nitrogen ratio (C:N) on water quality and growth performance of Litopenaeus vannamei (Boone, 1931) in the biofloc system with a salinity of 5‰
Hai-Hong Huang, Chao-Yun Li, Tao Liang, Yan-Ju Lei, Pin-Hong Yang
bioRxiv 2021.12.28.474292; doi: https://doi.org/10.1101/2021.12.28.474292
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Effects of carbon to nitrogen ratio (C:N) on water quality and growth performance of Litopenaeus vannamei (Boone, 1931) in the biofloc system with a salinity of 5‰
Hai-Hong Huang, Chao-Yun Li, Tao Liang, Yan-Ju Lei, Pin-Hong Yang
bioRxiv 2021.12.28.474292; doi: https://doi.org/10.1101/2021.12.28.474292

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