Effects of stocking density of gray mullet Mugil cephalus on water quality, growth performance, nutrient conversion rate, and microbial community structure in the white shrimp Litopenaeus vannamei integrated system

The present study evaluated the effects of stocking density on water quality parameters, growth performance and survival rate of white leg shrimp Litopenaeus vannamei, reared in fiberglass tanks, without water exchange. Three stocking densities (50, 100 and 200 shrimp/m2) were tested. Each treatment consisted of three replicates fiberglass tanks (500 L). The shrimp were fed ad libitum four times per day with a commercial pellet (40-42% protein). After an 8-week trial, concentrations of nutrients in the culture tanks showed an increasing linear relationship with increasing stocking density. The growth performance of shrimp in low stocking densities was significantly greater than that in high stocking densities. The results from this study demonstrate that with increasing the stocking density the production of shrimp increased but in a low final weight and survival compared to low stocking density.

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Water Quality and Microbial Community Changes in an Urban River after Micro-Nano Bubble Technology in Situ Treatment

Water ◽

10.3390/w11010066 ◽

2019 ◽

Vol 11 (1) ◽

pp. 66 ◽

Cited By ~ 11

Author(s):

Yifei Wu ◽

Hui Lin ◽

Weizhao Yin ◽

Sicheng Shao ◽

Sihao Lv ◽

...

Keyword(s):

Water Quality ◽

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Oxygen Demand ◽

Ammonia Nitrogen ◽

Oxidation Reduction ◽

Oxidation Reduction Potential ◽

Dominant Bacteria

Currently, black-odor river has received great attention in China. In this study, the micro-nano bubble technology (MBT) was used to mitigate the water pollution rapidly and continuously by increasing the concentration of dissolved oxygen (DO) in water. During treatment, the concentration of DO increased from 0.60 mg/L to over 5.00 mg/L, and the oxidation reduction potential (ORP) also changed from a negative value to over 100.00 mV after only five days aeration. High throughput pyrosequencing technology was employed to identify the microbial community structure. At genus level, the dominant bacteria were anaerobic and nutrient-loving microbes (e.g., Arcobacter sp., Azonexus sp., and Citrobacter sp.) before, and the relative abundances of aerobic and functional microbes (e.g., Perlucidibaca sp., Pseudarcicella sp., Rhodoluna sp., and Sediminibacterium sp.) were increased after treatment. Meanwhile, the water quality was significantly improved with about 50% removal ratios of chemical oxygen demand (CODCr) and ammonia nitrogen (NH4+-N). Canonical correspondence analysis (CCA) results showed that microbial community structure shaped by COD, DO, NH4+-N, and TP, CCA1 and CCA2 explained 41.94% and 24.56% of total variances, respectively. Overall, the MBT could improve the water quality of urban black-odor river by raising the DO and activate the aerobic microbes.

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Water quality and microbial community structure in juvenile Atlantic cod (Gadus morhua L.) cultures

Aquaculture ◽

10.1016/j.aquaculture.2011.03.016 ◽

2011 ◽

Vol 316 (1-4) ◽

pp. 111-120 ◽

Cited By ~ 8

Author(s):

Terje van der Meeren ◽

Laila Brunvold ◽

Ruth-Anne Sandaa ◽

Øivind Bergh ◽

Tonje Castberg ◽

...

Keyword(s):

Water Quality ◽

Community Structure ◽

Microbial Community ◽

Microbial Community Structure ◽

Gadus Morhua ◽

Atlantic Cod

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The effects of artificial substrate and stocking density on Pacific white shrimp (Litopenaeus vannamei) performance and water quality dynamics in high tunnel-based biofloc systems

Aquacultural Engineering ◽

10.1016/j.aquaeng.2020.102093 ◽

2020 ◽

Vol 90 ◽

pp. 102093 ◽

Cited By ~ 2

Author(s):

Leo J. Fleckenstein ◽

Nathan A. Kring ◽

Thomas W. Tierney ◽

Jill C. Fisk ◽

Benjamin C. Lawson ◽

...

Keyword(s):

Water Quality ◽

Litopenaeus Vannamei ◽

Stocking Density ◽

Pacific White Shrimp ◽

Artificial Substrate ◽

White Shrimp ◽

High Tunnel

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Aquaculture Water Quality Improvement by Mixed Bacillus and Its Effects on Microbial Community Structure

10.21203/rs.3.rs-1057159/v1 ◽

2021 ◽

Author(s):

Xue Li ◽

Tianie Wang ◽

Baorong Fu ◽

Xiyan Mu

Keyword(s):

Water Quality ◽

Community Structure ◽

Microbial Community ◽

Relative Abundance ◽

Bacillus Megaterium ◽

Microbial Community Structure ◽

Pathogenic Bacteria ◽

Phosphorus Compounds ◽

Nitrogen And Phosphorus ◽

Aquaculture Water

Abstract Nutrients nitrogen and phosphorus pollution in aquaculture is one of the greatest challenges threatening the survival of aquatic organisms, which requires efficient and sustainable remediation approach. Microbial remediation, especially the application of probiotics, has recently gained popularity in improving the water quality and maintaining the health condition of aquatic animals. In the present study, two groups of mixed Bacillus (Bacillus megaterium and Bacillus subtilis (A0+BS) and Bacillus megaterium and Bacillus coagulans (A0+BC)) were applied to aquaculture system of Crucian carp to improve the treatment of nitrogenous and phosphorus compounds. The effects of mixed Bacillus on water quality, and the structure and function of microbial communities in aquaculture water were investigated. Our results showed that the improvement effect of mixed Bacillus A0+BS on water quality was better than that of A0+BC, and the NH4+-N, NO2--N, NO3--N and total phosphorus (TP) concentrations were reduced by 46.3%, 76.3%, 35.6%, and 80.3%, respectively. In addition, both groups of mixed Bacillus increased the diversity of bacterial community and decreased the diversity of fungal community. Microbial community analysis showed that mixed Bacillus A0+BS increased the relative abundance of bacteria related with nitrogen and phosphorus removal, e.g., Proteobacteria, Actinobacteria, Comamonas, and Stenotrophomonas, but decreased the relative abundance of pathogenic bacteria (Acinetobacter and Pseudomonas) and fungi (Epicoccum and Fusarium). The redundancy analysis showed that NH4+-N, NO2--N, and TP were primary environmental factors affecting the microbial community in aquaculture water. PICRUST analysis indicated that all functional pathways in the treatment groups were up-regulated, and all pathways in A0+BS group were richer than those in other groups. These results indicated that mixed Bacillus A0+BS addition produced good results in reducing nitrogenous and phosphorus compounds and shaped a favorable microbial community structure to further improve water quality.

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