&lt;b&gt;Integration between bioflocs and periphyton in Nile tilapia culture tanks

Cavalcante, Davi de Holanda; Lima, Francisco Roberto dos Santos; Rebouças, Vanessa Tomaz; Sá, Marcelo Vinı́cius do Carmo e

doi:10.4025/actascitechnol.v39i5.30123

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…Nonetheless, the lowest yield results from this experiment of 3.86 ± 0.21 kg fish per metre cube was higher than 1.23 ± 0.09 kg fish per metre cube reported by Cavalcante et al. (2017) studying periphyton and biofloc integration in tanks used to culture O. niloticus .…”

Section: Discussioncontrasting

confidence: 76%

Biofloc system improves protein utilization efficiency and growth performance of Nile tilapia, Oreochromis niloticus fry: Experimental evidence

Zablon

Ogello

Getabu

et al. 2022

Aquaculture Fish & Fisheries

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This study evaluated the effect of biofloc technology (BFT) on protein utilization and growth performance of Oreochromis niloticus fry under green house for 14 weeks under a 3 × 2 factorial design involving three crude protein (CP) levels (22, 27 and 35%) and two different carbon sources. Molasses and glucose were independently used as carbon sources in the BFT tanks with aeration using air stones. Mono-sex fish fry of mean weight 0.07 ± 0.01 g and total length 13.1 ± 0.01 mm were stocked at density of 1 fish per litre. The fishes were fed on the three commercial diets that were randomly assigned in triplicates, with the control treatment being 35% CP. Feeding was done twice daily at 5% body weight, while sludge was siphoned weekly. Calculations of specific growth rate (SGR), protein efficiency ratio (PER), food conversion ratio (FCR), survival and measurement of water quality parameters were also performed. Protein levels and carbon sources had significant effects (p < 0.05) on dissolved oxygen (DO) and NH 3 protein levels and carbon sources had significant interaction (p < 0.05) on pH.There was a significantly higher FCR in the control treatment (0.89) than in glucose (0.56-0.57) and molasses (0.59-0.63) bioflocs; furthermore, it was significantly different between the carbon sources. The PER was significantly higher in the control (8.42) than in glucose (5.03-7.99) and molasses (4.81-7.23) bioflocs. No significant interactions (p > 0.05) of protein levels and carbon sources were recorded on PER. However, it was significantly affected (p < 0.05) by protein levels and carbon sources. No significant effects (p > 0.05) of dietary protein level, carbon source, or their interaction were observed on SGR and condition factor. The SGR was significantly lower in the control (2.91) than glucose (3.52-3.59) and molasses (3.49-3.56) bioflocs. The condition factor was significantly lower in the control (0.81) than glucose (1.72-1.83) and molasses (1.82-1.84) bioflocs. Survival rates were significantly higher in glucose (>97%) and molasses (>94%) than the control with a lower value of 74.7%. The biofloc increased protein utilization efficiency, which improved FCR and enhanced fish growth rate evenThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Discussioncontrasting

confidence: 76%

Biofloc system improves protein utilization efficiency and growth performance of Nile tilapia, Oreochromis niloticus fry: Experimental evidence

Zablon

Ogello

Getabu

et al. 2022

Aquaculture Fish & Fisheries

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“…The concentrations of NH 3 and H 2 S in water were calculated through the results of TAN and total dissolved sulfide, respectively (El-Shafai, El-Gohary, Nasr, Van der Steen, & Gijzen, 2004). All water quality methods were the same performed by Cavalcante, Lima, and Rebouças (2017).…”

Section: Methodsmentioning

confidence: 99%

<b>Partial replacement of artificial diets by wet bioflocs biomass in Nile tilapia culture tanks

Caldini

Capistrano

Filho

et al. 2018

Acta Sci. Anim. Sci.

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The present work aimed to assess the partial replacement of artificial diets by wet bioflocs biomass in the culture of Nile tilapia juveniles. Fish were fed on different combinations of commercial dry diets (CD) and wet bioflocs biomass (BF), as it follows: 75% CD + 25% BF, 50% CD + 50% BF, and 25% CD + 75% BF, dry matter basis. There were also positive control tanks in which the fish received only commercial diet (100% CD), and three negative control tanks where the reductions of dry diets were not compensated by wet bioflocs biomass (75% CD, 50% CD, and 25% CD). Bioflocs were produced in one 500-L outdoor tank, which did not belong to the culture system, and it was called “separate BFT tank”, in which there was a daily adjustment of the C: N ratio of water to 15: 1, by the application of dry molasses to the water. There were no significant differences between the treatments for water pH, O2, TAN and NH3. Except by 25% CD, nitrite concentrations in water were lower in bioflocs tanks than in the artificial diet tanks. The final body weight of fish was significantly higher in tanks that received only dry diets (21.9 ± 6.4 g) than in tanks with a combination of 50% dry diet and 50% wet bioflocs biomass (10.4 ± 2.5 g; p < 0.05). It can be concluded that the impairment on the growth performance of tilapia submitted to feeding restriction is lessened if wet bioflocs biomass is provided to the animals. Besides, the total substitution of artificial diets for wet bioflocs biomass in clear-water tanks is unfeasible because it leads to higher rates of mortality of tilapia in a relatively short period.

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“…In addition, organic particles contained in biofloc support the growth of protozoa and algae in the floc (Emerenciano et al 2012). As a result, this creates a variety of foods available for consumption by fish (Cavalcante et al 2017). Considering its effect on BFT systems, using biofloc as a feed additive instead of fishmeal may increase weight in fish (Kuhn et al 2009).…”

Section: Discussionmentioning

confidence: 99%

The Potential of Ornamental Fish Culture in Biofloc Technology with Different C/N Ratio and Multi-Criteria Decision Making Model: An Example of Goldfish (Carassius auratus)

Minaz

2024

Preprint

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Biofloc technology (BFT) has become an agenda not only to meet the need for protein food but also for ornamental aquaculture with the increasing interest in sustainable aquaculture. In this context, the current study focused on BFT for ornamental goldfish (Carassius auratus), which has commercial value. In the study conducted with control and two different C/N ratios (15:1 and 20:1), nitrogen cycle occurred rapidly in BFT groups. On the other hand, increasing the C/N ratio had a positive effect on total suspended solids and total bacteria count in the culture water. In terms of growth performance, specific growth rate and weight gain were observed to be significantly higher at high C/N ratio. Feed conversion ratio showed lower results for the C/N 20 group. According to the liver histological results, the vacuolization symptom is more severe in BFT groups. Considering all the results, the suitability of C. auratuscultivation in the BFT system with a C/N ratio of 20 was proven according to nine different evaluation criteria. In conclusion, the cultivation of C. auratus in BFT systems is recommended both economically and ecologically.

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<b>Integration between bioflocs and periphyton in Nile tilapia culture tanks

Cited by 5 publications

References 25 publications

Biofloc system improves protein utilization efficiency and growth performance of Nile tilapia, Oreochromis niloticus fry: Experimental evidence

Biofloc system improves protein utilization efficiency and growth performance of Nile tilapia, Oreochromis niloticus fry: Experimental evidence

<b>Partial replacement of artificial diets by wet bioflocs biomass in Nile tilapia culture tanks

The Potential of Ornamental Fish Culture in Biofloc Technology with Different C/N Ratio and Multi-Criteria Decision Making Model: An Example of Goldfish (Carassius auratus)

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