&lt;b&gt;Nile tilapia culture under feeding restriction in bioflocs and bioflocs plus periphyton tanks

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

doi:10.4025/actascianimsci.v39i3.33574

Cited by 11 publications

(8 citation statements)

References 21 publications

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“…The worst results of FCR and PER were found in tanks with no feed restriction. These results differ from Cavalcante et al (38) , who have not observed significant differences for FCR and PER in BFT tanks with and without feed restriction. The better FCR and PER results in tanks with feed restriction could be explained by their greater bioflocs intake.…”

Section: Fish Growth Performancecontrasting

confidence: 99%

Dietary supplementation of tilapia juveniles reared in bft (bioflocs) tanks with dl-methionine

et al. 2021

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The present study aimed at determining the effects of dietary DL-methionine supplementation on the water quality, bioflocs composition and Nile tilapia juvenile’s (initial body weight = 2.76 ± 0.06 g) growth performance in BFT rearing tanks (18 fish/100-L tank). Fish were or not subjected to artificial feed restriction. The experimental treatments consisted of two control groups: 1 - no feed restriction, no methionine supplementation; 2 - feed restriction at 25%, no methionine supplementation. There were also four treated groups: 1 - feed restriction at 25%, dietary DL-methionine supplementation at 0.5%; 2 - feed restriction at 25%, dietary DL-methionine supplementation at 1.0%; 3 - feed restriction at 25%, dietary DL-methionine supplementation at 2.0%; 4 - feed restriction at 25%, DL-methionine supplementation of molasses at 1.0. Supplementation of the commercial diet with DL-methionine has not affected either the water quality of the BFT Nile tilapia rearing tanks or the proximate composition of the bioflocs. After 8 weeks, weight gain of fish reared in tanks with feed restriction and dietary DL-methionine supplementation at 1% or 2% has not differed (P>0.05) from the tanks without feed restriction. In conclusion, it is possible to restrict the daily feed allowances of Nile tilapia juveniles reared in BFT tanks at 25%, with no growth performance impairment, if a minimal dietary DL-methionine supplementation of 1.0% is given.

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Section: Fish Growth Performancecontrasting

confidence: 99%

Dietary supplementation of tilapia juveniles reared in bft (bioflocs) tanks with dl-methionine

et al. 2021

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“…High ammonia concentrations in the first 2 weeks of the study may be attributed to low numbers of heterotrophic bacteria in the biofloc units which can transform nitrites to nitrates (Azim & Little, 2008; Avnimelech, 2012). Heterotrophic bacteria have been found to assimilate ammonia more rapidly than nitrifying bacteria, as they grow tenfold faster as compared to nitrifying bacteria (Crab et al., 2012; Cavalcante et al., 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Apart from heterotrophic bacteria, the recycled nutrients from organic particles promote the growth of protozoa and algae in biofloc systems (Emerenciano et al., 2012). This increases the variety of foods consumed by fish in a biofloc culture unit, resulting in higher growth performance of farmed fish species (Cavalcante et al., 2017). Bioflocs have been documented to contain chlorophylls, phytosteroids and carotenoids, which are bioactive compounds (Ju et al., 2008), as well as poly‐beta‐hydroxybutyrate organic compounds (De Schryver et al., 2010), all of which affect the growth performance of aquatic organisms positively.…”

Section: Discussionmentioning

confidence: 99%

“…Understanding these requirements will help to maximize the utilization of feeds, reduce production costs and decrease the nutrient load in effluents discharged to the environment (Mohsen et al., 2010). Only up to a maximum of 30% of nitrogen and phosphorus can be recovered from formulated feeds using conventional aquaculture systems (Cavalcante et al., 2017). Avnimelech (2006) reported that only 25% of CP in the feed is converted into harvestable products, while the rest is lost to the system in the form of organic nitrogen, feed remnants and faecal matter.…”

Section: Introductionmentioning

confidence: 99%

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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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“…Moreover, FCR was lower when compared to works in which fish were fed normal rates and the overall performance was similar to Nile tilapia reared in bioflocs under densities greater than 500 fish m −3 [ 43 ]. Cavalcante et al [ 50 ] evaluated feeding rate restrictions of 15% and 30% compared to normally fed Nile tilapia and reported a FCR of 1.0 without significant differences between treatments due to the adjustment of feed allowances according to gains in biomass. In the present study, feed restriction was greater than 80% when compared to the normal feeding rates recommended by Ostrensky and Boeger [ 51 ].…”

Section: Discussionmentioning

confidence: 99%

Effects of Microalgae Addition and Fish Feed Supplementation in the Integrated Rearing of Pacific White Shrimp and Nile Tilapia Using Biofloc Technology

Silva

Pereira

Martins

et al. 2022

Animals

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This study aims to evaluate a Pacific white shrimp and Nile tilapia integrated system using biofloc technology with or without the addition of the microalgae Scenedesmus obliquus and with or without fish feed supplementation in a two-factor 62-day experiment. The shrimp (2.16 ± 0.01 g) were reared under a density of 400 shrimp m−3 and the fish (1.53 ± 0.12 g) were reared under a density of 522 fish m−3. The microalgae was added to the culture water two times a week. Growth performance, sludge production, and water microbiology were evaluated. Fish feed and the microalgae addition improved fish final biomass in 58% and 14%, respectively (p < 0.05). Fish survival was significantly higher when microalgae was added (93.9 ± 1.8%) compared with the treatments without microalgae addition (86.2 ± 7.6%) (p < 0.05). The yield of the overall system was higher in the treatments with fish feed supplementation (4.2 ± 0.2 kg m−3) compared with no addition (3.9 ± 0.2 kg m−3) (p < 0.05). These results suggest that fish feed supplementation at the rate of 1% of the biomass and microalgae inoculation can improve fish growth performance and system yield, without affecting sludge production and water microbiology. This work is an expansion of a conference paper with the same title.

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<b>Nile tilapia culture under feeding restriction in bioflocs and bioflocs plus periphyton tanks

Cited by 11 publications

References 21 publications

Dietary supplementation of tilapia juveniles reared in bft (bioflocs) tanks with dl-methionine

Dietary supplementation of tilapia juveniles reared in bft (bioflocs) tanks with dl-methionine

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

Effects of Microalgae Addition and Fish Feed Supplementation in the Integrated Rearing of Pacific White Shrimp and Nile Tilapia Using Biofloc Technology

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