Effect of the particle size on the ammonia removal rate and the bacterial community composition of bioflocs

Chen, Xiaoqing; Luo, Guozhi; Meng, Haoyan; Tan, Hongxin

doi:10.1016/j.aquaeng.2019.102001

Cited by 16 publications

(13 citation statements)

References 41 publications

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“…Actually, Only two families belonging to autotrophic nitrifying bacteria, Nitrospiraceae and Nitrosomonadaceae (Sliekers, Derwort, Gomez, Strous, Kuenen, & Jetten, 2002), were found in the bacterial community at 28 d of the present study, with a total proportion of 0.004%. Besides, although some heterotrophic bacteria with nitrification capacity were also found in the bacterial community of the present study, such as genera Acinetobacter, Bacillus, Paracoccus and Pseudomonas (Chen, Luo, Meng, & Tan, 2019;Liu, Li, Wei, Zhu, Han, Jin, … & Xie, 2019), their proportions were also very low. Correspondingly, the proportion of inferring functions of bacterial community relating to inorganic transformation were low (18% of the level-2 KEGG pathway nitrogen metabolism) in the present study.…”

Section: Influence Of Bacterial Community On Water Qualitycontrasting

confidence: 53%

Bacterial composition and inferring function profiles in the biofloc system rearing Litopenaeus vannamei postlarvae at a low salinity

Huang

Li²,

Lei

et al. 2022

Preprint

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This study aimed to investigate the bacterial composition and inferring function profiles in the biofloc system rearing Litopenaeus vannamei postlarvae (PL) at a low salinity condition. PL (~ stage 15) were stocked in four parallel tanks filled in water with a salinity of 5.0‰ at a density of 4000 individuals per m3 for a 28-days culture experiment, during which glucose was added as carbon source with a C:N of 20:1. At the end of experiment, water was sampled from each tank and pooled to extract microbial DNA for high-throughput sequencing of V3-V4 region of 16S rRNA gene. Results showed that the bacterial community at 28 d was dominated by phyla of Proteobacteria (45.8%), Bacteroidetes (21.1%), Planctomycetes (13.5%), Chlamydiae (10.3%) and Firmicutes (6.8%). A proportion of 81% inferring KEGG functions of this bacterial community associated with metabolism. Among functions relating to nitrogen metabolism, 48.5% were involved in the conversion of ammonia to glutamate, but the proportion of those involved in transformation among ammonia, nitrite and nitrate was 18.0% in total, inferring higher protein-synthesis but lower inorganic nitrogen-transformation capacities of the bacterial community. At the same time (28 d), high levels of total nitrogen (231.3±6.0 mg L-1) and biofloc (127.0±63.0 mL L-1), but low concentrations of ammonia (0.04±0.01 mg L-1), nitrite (0.2±0.1 mg L-1) and nitrate (12.9±2.5 mg L-1) were observed. The results supply a novel insight for understanding the function of bacterial community in the biofloc system nursing L. vannamei PL at a low salinity.

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Section: Influence Of Bacterial Community On Water Qualitycontrasting

confidence: 53%

Bacterial composition and inferring function profiles in the biofloc system rearing Litopenaeus vannamei postlarvae at a low salinity

Huang

Li²,

Lei

et al. 2022

Preprint

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“…The turbidity in the present study was determined on water sample without big-size biofloc which settled by using an Imhoff cone for 15 min, indicating that this parameter was correlated to the content of small-size biofloc. Previous studies have showed that the bacterial groups are different between small- and big-size bioflocs (Chen et al, 2019; Huang et al, 2020). Therefore, the removal operation in this study might make settleable solids (big-size biofloc) as well as bacterial groups attached be removed from the water column, which would improve the growth of bacteria adhering on small-size biofloc retained in the water body, by reducing the competition from bacteria relating with big-size biofloc, and in turn, prompting formation of small-size suspended biofloc and increasing the turbidity.…”

Section: Discussionmentioning

confidence: 99%

“…Generally, highly diverse bacterial community including 18-40 phyla were observed in waterbody of biofloc systems raising P. vannamei (Baliga et al, 2021; Ferreira et al, 2021; Huerta-Rabago et al, 2019; Vargas-Albores et al, 2019), with a Shannon index as high as 5.31-7.23 (Addo et al, 2021; Chen et al, 2019; Gao et al, 2019; Huang et al, 2021; Jiang et al, 2020; Kim et al, 2021; Pilotto et al, 2018). Similarly, in the present study, 30 phyla were observed in both treatments with a Shannon index of 6.14-6.77.…”

Section: Discussionmentioning

confidence: 99%

Effects of substrate on shrimp growth, water quality and bacterial community in the biofloc system nursing Penaeus vannamei postlarvae

Huang

Li²,

Lei

et al. 2022

Preprint

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This study aimed to investigate the effects of substrate on water quality, shrimp growth and bacterial community in the biofloc system with a salinity of 5‰. Two treatments, biofloc system with (sB) or without (nB) addition of elastic solid packing filler (nylon) as substrate, were set up. Penaeus vannamei postlarvae (PL, ~ stage 15) were stocked at a density of 4000 PL m-3 in each treatment with triplicates for a 28-days culture experiment, taking glucose as carbon source (C:N 15:1). Results showed that the survival rate (96.3±3.6%), FCR (0.76±0.06) and productivity (1.54±0.12 kg m-3) in sB treatment were significantly better than those in nB treatment (81.0±7.1%, 0.98±0.08 and 1.14±0.09 kg m-3, P<0.05). All water parameters were in the recommended ranges without significant effect from substrate (P > 0.05), except TSS, turbidity, biofloc volume, pH and carbonate alkalinity (P < 0.05). Actinobacteria (4.0-22.7%), Bacteroidetes (10.4-33.5%), Firmicutes (0.2-11.2%), Planctomycetes (4.0-14.9%) and Proteobacteria (29.4-59.0%) were the most dominant phyla for both treatments. However, the bacterial community in sB treatment showed to be significantly different from that in nB treatment (Jaccard distance 0.94±0.01, P=0.001). Substrate showed significant effects on Shannon, Heip, Pielou and Simpson index, as well as relative abundances of Actinobacteria, Bacteroidetes and Planctomycetes (P < 0.05). The results suggested that addition of substrate affected the shrimp growth, water quality and bacterial community in the biofloc system nursing P. vannamei PL with a 5 ‰ salinity.

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“…The ability of water quality control and nutritional composition of differently sized flocs has been studied (Chen et al, 2019;Ekasari et al, 2014;Souza et al, 2019). In the present study, we focussed mainly on the short-term stress effects of differently sized flocs on Japanese seabass juveniles.…”

Section: Discussionmentioning

confidence: 99%

Effects of different biofloc sizes on the short‐term stress of Japanese seabass, Lateolabrax japonicus (Cuvier), juveniles reared in biofloc aquaculture systems

Liu

et al. 2022

Aquaculture Research

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Biofloc technology (BFT) is a new approach widely studied and applied in aquaculture (Avnimelech, 2012). In BFT systems, the bacterial communities involved in water treatment processes are stimulated to grow in suspension and form flocs through flocculation mechanisms. The major role of flocs in aquaculture is their ability to treat aquaculture water for continual use over several production cycles (Avnimelech, 2012;Kim et al., 2020), as natural food and probiotics (Avnimelech, 2012). BFT systems can also be associated with the set-up of recirculating aquaculture systems (RAS) and are often applied in the treatment of wastewater (Liu et al., 2021).However, when the C/N ratios in BFT are elevated in the aquaculture system, they not only maintain and enhance growth, including the population of microorganisms involved in heterotrophic assimilation and conversion of ammonia nitrogen into bacterial biomass, but also create problems, such as the rapid growth of flocs and total suspended solids (TSS) (Avnimelech, 2012;Hargreaves, 2006). In the BFT, high TSS levels can simultaneously increase the difficulty of controlling parameters such as dissolved oxygen (DO) (Avnimelech, 2012;Hargreaves, 2006) and exert biological effects of chronic stress on aquatic animals, thus affecting the stable operation and

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Effect of the particle size on the ammonia removal rate and the bacterial community composition of bioflocs

Cited by 16 publications

References 41 publications

Bacterial composition and inferring function profiles in the biofloc system rearing Litopenaeus vannamei postlarvae at a low salinity

Bacterial composition and inferring function profiles in the biofloc system rearing Litopenaeus vannamei postlarvae at a low salinity

Effects of substrate on shrimp growth, water quality and bacterial community in the biofloc system nursing Penaeus vannamei postlarvae

Effects of different biofloc sizes on the short‐term stress of Japanese seabass, Lateolabrax japonicus (Cuvier), juveniles reared in biofloc aquaculture systems

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