Effects of biochar on microbial community in bioflocs and gut of Oreochromis niloticus reared in a biofloc system

Abakari, Godwin; Luo, Guozhi; Shao, Lina; Yusuf, Abdullateef; Cobbina, Samuel Jerry

doi:10.1007/s10499-021-00697-3

Cited by 17 publications

(3 citation statements)

References 51 publications

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“…In this sense, Viver et al [48] recently documented that the gut microbiome is nonstable and highly dependent on the quality of the food. In this context, several studies showed that bioflocs are abundant and more diverse in bacterial communities compared to the gut of aquatic animals (fish and shrimp) in biofloc systems; thus, different carbon sources can influence bacterial community structure in both bioflocs and the fish gut [49,50]. As Kumar recently revised [51], biofloc particles may promote immune response by means of providing a wide range of immunostimulatory effects against microbial infections due to the presence of either lipopolysaccharides, glucans, or peptidoglycans from heterotrophic microbial cell walls.…”

Section: Resultsmentioning

confidence: 99%

Rearing European Eel (Anguilla anguilla) Elvers in a Biofloc System

Vinatea,

Carbó,

Andree

et al. 2023

Animals

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European eel (Anguilla anguilla) elvers (initial body weight (BW) = 3 g) were raised in triplicate for 60 days in a biofloc system (BFT) at 21 °C. Data from the current first study evaluating this farming technology indicated that European eel elvers adapted well to BFT systems as data on growth performance (specific growth rate = 1.48% ± 0.13 BW/day and FCR = 1.05 ± 0.09) indicated, with production costs using BFT being lower than conventional RAS units. The most critical issues associated with this aquaculture system were the maintenance of the biofloc in tanks by the regular addition of refined sugar (46% C) to keep a relationship for C:N of 20:1, and the prevention of emergence of opportunistic pathogens like the monogenean Pseudodactylogyrus sp. The overall results of this study in terms of elvers’ performance and quality and the composition of the biofloc material and its microbial composition indicated that BFT, which is considered to be one of the most cost-effective, sustainable, and environmentally friendly farming systems due to its zero water exchange and improvement of feed conversion ratio by the dietary contribution of bioflocs, may be satisfactorily used for farming European eels elvers at a density of 2 kg/m3. However, further studies are needed to test this technology with older eel stages.

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Section: Resultsmentioning

confidence: 99%

Rearing European Eel (Anguilla anguilla) Elvers in a Biofloc System

Vinatea,

Carbó,

Andree

et al. 2023

Animals

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“…The biological performance of the cultivated aquatic species can be favored using microbial consortia (biofloc), well-identified microbes (probiotics), or microbial-enhancing substances (prebiotics). Several reports have documented the influence of microbes and changes in environmental microbial composition on gut microbiota ( Abakari et al, 2021 ; Abdel-Ghany et al, 2020 ; Baumgartner, James & Ellison, 2022 ). However, from a broader perspective, our results did not reveal significant differences in alpha and beta diversity, suggesting that modifications can only occur within a narrow range.…”

Section: Discussionmentioning

confidence: 99%

Microbiota plasticity in tilapia gut revealed by meta-analysis evaluating the effect of probiotics, prebiotics, and biofloc

Martinez-Porchas,

Preciado-Álvarez,

Vargas-Albores

et al. 2023

PeerJ

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Tilapia species are among the most cultivated fish worldwide due to their biological advantages but face several challenges, including environmental impact and disease outbreaks. Feed additives, such as probiotics, prebiotics, and other microorganisms, have emerged as strategies to protect against pathogens and promote immune system activation and other host responses, with consequent reductions in antibiotic use. Because these additives also influence tilapia’s gut microbiota and positively affect the tilapia culture, we assume it is a flexible annex organ capable of being subject to significant modifications without affecting the biological performance of the host. Therefore, we evaluated the effect of probiotics and other additives ingested by tilapia on its gut microbiota through a meta-analysis of several bioprojects studying the tilapia gut microbiota exposed to feed additives (probiotic, prebiotic, biofloc). A total of 221 tilapia gut microbiota samples from 14 bioprojects were evaluated. Alpha and beta diversity metrics showed no differentiation patterns in relation to the control group, either comparing additives as a group or individually. Results also revealed a control group with a wide dispersion pattern even when these fish did not receive additives. After concatenating the information, the tilapia gut core microbiota was represented by four enriched phyla including Proteobacteria (31%), Fusobacteria (23%), Actinobacteria (19%), and Firmicutes (16%), and seven minor phyla Planctomycetes (1%), Chlamydiae (1%), Chloroflexi (1%), Cyanobacteria (1%), Spirochaetes (1%), Deinococcus Thermus (1%), and Verrucomicrobia (1%). Finally, results suggest that the tilapia gut microbiota is a dynamic microbial community that can plastically respond to feed additives exposure with the potential to influence its taxonomic profile allowing a considerable optimal range of variation, probably guaranteeing its physiological function under different circumstances.

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“…The small number of samples ( n = 4) limited the degrees of freedom of the ANOVA and may have influenced the absence of significant differences between treatments. However, the potential beneficial effects of rearing fish using BFT (Abakari et al, 2021; Santos et al, 2021) may have also masked the positive effects of FSM on enhancing acid lactic bacterial populations in goldfish gut due to the microbial characteristics of the BFT system (Avnimelech, 2007). In this sense, further studies with more robust microbiological analyses using massive sequencing techniques are necessary to describe the different types of microorganisms and confirm the results obtained.…”

Section: Discussionmentioning

confidence: 99%

Fermented soybean meal can partially replace fishmeal and improve the intestinal condition of goldfish juveniles reared in a biofloc system

Cunha

Besen

Oliveira

et al. 2022

Aquaculture Research

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This study evaluated the effects of different dietary inclusion levels of fermented soybean meal (FSM) as replacement for fish meal and their effects on the productive performance and intestinal condition of goldfish (Carassius auratus) produced in biofloc (BFT) system. Five isoproteic (39.5% crude protein) and isoenergetic diets (4250 kcal kg −1 of crude energy) were formulated with FSM inclusion levels of 0%, 7%, 14%, 21% and 28% (0, 11, 22, 32 and 43 fish meal replacement). A total of 400 goldfish (0.25 ± 0.02 g) were weighed and distributed in 20 glass aquariums (15 L). Fish were fed twice daily for 56 days. The diet with FSM inclusion level of 28% reduced the weight gain and the specific growth rate and increased the feed conversion of the goldfish. Diets with FSM inclusion levels of 21% and 28% increased the α-amylase activity in the fish intestine. The diet with FSM inclusion level of 21% increased total height of the intestinal villi of the goldfish. In conclusion, the inclusion of up to 21% of FSM can replace fishmeal without affecting the growth of goldfish juveniles reared in BFT system. Fish fed 21% of FSM showed evidence of improvement in the intestinal health.

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Effects of biochar on microbial community in bioflocs and gut of Oreochromis niloticus reared in a biofloc system

Cited by 17 publications

References 51 publications

Rearing European Eel (Anguilla anguilla) Elvers in a Biofloc System

Rearing European Eel (Anguilla anguilla) Elvers in a Biofloc System

Microbiota plasticity in tilapia gut revealed by meta-analysis evaluating the effect of probiotics, prebiotics, and biofloc

Fermented soybean meal can partially replace fishmeal and improve the intestinal condition of goldfish juveniles reared in a biofloc system

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