Cultivo da tilápia do Nilo Oreochromis niloticus em sistema de bioflocos com diferentes densidades de estocagem

Lima, Eduardo Cesar Rodrigues de; Souza, Rafael Liano de; Wambach, Xélen Faria; Silva, Ugo Lima; Correia, Eudes de Souza

doi:10.1590/s1519-99402015000400018

Cited by 22 publications

(13 citation statements)

References 13 publications

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“…Mean values of erythrocyte numbers (RBC), although not significant (p > 0.05), presented values lower than the control treatment (1.49±0.31 × 10 6 mm -3 ), prior to transport. The mean number of total erythrocytes was similar to the values found by Azevedo et al (2006) 1.5 × 10 6 μL and lower than Ighwela et al (2012) 4.3 × 10 6 μL. Red blood cell count (RBC) and hematocrit are tools used to diagnose stressful conditions in fish.…”

Section: Discussionsupporting

confidence: 79%

Effect of Mechanical Vibrations During Transport Operations of Nilo Tilapia (Oreochromis niloticus)

Rebouças¹,

Almeida²,

Paula³

et al. 2019

JAS

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Oscillatory movements present in the transport of live fish may compromise the physiological stability and the future performance of the animals. Therefore, the objective of this research was to evaluate the effect of mechanical vibrations in the transport of Nile tilapia through vibration levels and shocks occurred in transport boxes previously installed in a truck. The research was carried out in a fish farming integrating company in the state of Ceará, Brazil, with the monitoring of 5 live fish loads. The transport truck used was of the open type, with capacity for five boxes of fiberglass with a useful volume of 2400 L, density of 236 kg m-3. The data were recorded through five dataloggers, to monitor the vibration level (m s-2) and the occurrence and amplitude of mechanical shocks on the roads. Hematological, metabolic and ionic responses of fish were evaluated as well as visual observations of physical injuries. The most intense shocks occurred with the truck between 60 and 80 km h-1, with vibrations 1.151 m s-2 in the transport box, as well as in the water 0.489 m s-2. Larger vibration levels occurred on the asphalt road, with an average value of 1.13 m s-2, while on the dirt road they registered an average of 0.57 m s-2. Vibratory and mechanical stimuli presented secondary responses to blood level stress with alterations in glycemia, hematocrit, hemoglobin and magnesium ions. Physical lesions with 34% severe and 21% moderate, showed an uncomfortable environmental condition to fish.

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Section: Discussionsupporting

confidence: 79%

Effect of Mechanical Vibrations During Transport Operations of Nilo Tilapia (Oreochromis niloticus)

Rebouças¹,

Almeida²,

Paula³

et al. 2019

JAS

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“…Zootechnical performance during the cultivation of tilapia fingerlings in a biofloc system treatment (T1 -T5) and control treatment (CT) at different densities for 64 days. The maximum concentration of ammonia (6.5 mg L -1 ) was below the 48-h LC 50 lethal concentration found by Lima et al (2015) for Nile tilapia fingerlings (7.1 mg L -1 of N-NH 3 ). The low mortality of the fingerlings could be attributed to the high level of acclimation exhibited by tilapia when exposed to low concentrations of dissolved oxygen and high concentrations of nitrogen compounds (Baldisseroto, 2013;Lima, 2013).…”

Section: Discussionmentioning

confidence: 57%

“…Biofloc studies have been carried out for several species of fish, including African catfish (Clarias gariepinus) (Dauda et al, 2018), jundiá (Rhamdia quelen) (Poli et al, 2015), carp (Cyprinus carpio) (Najdegerami et al, 2016), and piracanjuba (Brycon orbignyanus) (Sgnaulin et al, 2017). The BFT applied to tilapia culture has been studied by several researchers, both in the initial stages of cultivation (Lima et al, 2015;Brol et al, 2017) and the fattening phase (Azim and Little, 2008;Kubitza, 2011;Mansour and Esteban, 2017).…”

Section: Introductionmentioning

confidence: 99%

Zootechnical Performance Evaluation of the Use of Biofloc Technology in Nile Tilapia Fingerling Production at Different Densities

et al. 2019

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The effect of producing and culturing Nile tilapia (Oreochromis niloticus) fingerlings in biofloc technology (BFT)-based systems was investigated in terms of zootechnical performance, aiming to define the best culturing density for 64 days. A completely randomized design was used, with four replications totaling 24 experimental units. The weight gain of each batch of animals per experimental unit (E.U.) was evaluated at densities of 200, 400, 600, 800, and 1,000 fingerlings m-3. For controls, a Water Recirculation System with 248 fingerlings m-3 was used. The fingerlings were fed commercial feed containing 35% protein and brown sugar as a carbohydrate source at a C:N ratio of 20:1. Dissolved oxygen, total ammonia nitrogen, pH, and temperature were monitored daily, and nitrite and alkalinity were monitored weekly. The analysis of weight gain data obtained a linear function y =-0.0017X 2 + 3.724X-87.77, with r 2 = 0.864, coefficient of variation = 14.23%, and correlation coefficient = 0.91. At the end of the cultivation period the system's planktonic community presented high diversity, dominated by rotifers and diatoms. The data of survival, density management demand, and physicochemical parameters variations of the water suggested an optimal density of 800 fish m-3 , since this resulted in an average weight gain per E.U. of 1,891.25 ± 151.24 g, with a productive efficiency index of 274.96 that is approximately three times that of the control treatment (87.43). Biofloc technology can be employed in two-phase super-intensive Nile tilapia culture systems, with a stocking density in the rearing stage of 800 fish m-3 .

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“…Wasielesky et al (2006) found optimal C:N ratios for microbial floc formation from 14:1 to 30:1, with predominance of heterotrophic bacteria. Molasses were used for tilapia rearing by Widanarni, Ekasari and Maryam (2012) (C:N ratio of 15:1) and Lima et al (2015) (C:N ratio of 6:1).…”

Section: Introductionmentioning

confidence: 99%

Carbon Sources and C:n Ratios on Water Quality for Nile Tilapia Farming in Biofloc System

et al. 2017

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-The use of biofloc technology (BFT) can improve fish production in regions with low water availability. Therefore, information on dynamics of water quality is essential for success in fish rearing. Thus, the objective of the present study was to evaluate the water quality for Nile tilapia farming in a system without water exchange, during the fingerling stage, using different sources of carbon and C:N ratios. A completely randomized experimental design was used in a 2x3 factorial arrangement, with two carbon (C) to nitrogen (N) ratios (10:1 and 20:1) and three carbon sources (sugar, molasses and cassava starch). The C:N ratio and carbon source affected the variables alkalinity, settleable solids (SS), turbidity and total suspended solids (TSS), showing significantly higher values at C:N ratio of 20:1 (P < 0.05). The best carbon source for microbial floc formation were the molasses and sugar, under C:N ratios of 10:1 and 20:1. The stability of the monitored water quality parameters occurred from 6 to 7 weeks of rearing. The growth performance of Nile tilapia in BFT system fertilized with different organic carbon sources was not significantly different (P < 0.05) between treatments. The use of molasses to fertilize BFT systems can reduce costs of production in regions where this product is available. RESUMO -O uso da tecnologia de biofloco (BFT) pode contribuir para a produção de peixes em regiões com reduzida água. Portanto, compreender a dinâmica da qualidade da água é essencial para o sucesso do cultivo de peixes. O objetivo do presente estudo foi avaliar a qualidade da água no cultivo de tilápia do Nilo em sistema sem troca de água, durante a fase de alevinagem, utilizando diferentes fontes de carbono e relações C:N. O delineamento experimental utilizado foi o arranjo fatorial 2x3, contendo duas relações carbono (C) e nitrogênio (N) (10:1 e 20:1) e três fontes de carbono (açúcar, melaço e amido de mandioca). Ambas as relações C:N e fontes de carbono influenciaram as variáveis alcalinidade, sólidos sedimentáveis (SS), turbidez e sólidos suspensos totais (SST) demonstrando valores significativamente mais elevados na relação C:N 20:1 (P < 0,05). As melhores fontes de carbono para a formação de flocos microbianos foram observados na utilização do melaço e açúcar na relação C:N de 10:1 e 20:1. A estabilidade dos parâmetros de qualidade de água monitorados ocorreu entre a 6 e 7 semanas de cultivo. O desempenho de tilapia do Nilo em sistema BFT fertilizado com diferentes fontes de carbono orgânico não foi significativamente diferente (P < 0,05) entre os tratamentos. A escolha de melaço para a fertilização do sistema BFT também pode ajudar a reduzir o custo de produção em regiões onde há disponibilidade deste produto. Palavras-chave:Oreochromis niloticus. Piscicultura. Flocos microbianos. Alevinagem.

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Cultivo da tilápia do Nilo Oreochromis niloticus em sistema de bioflocos com diferentes densidades de estocagem

Cited by 22 publications

References 13 publications

Effect of Mechanical Vibrations During Transport Operations of Nilo Tilapia (Oreochromis niloticus)

Effect of Mechanical Vibrations During Transport Operations of Nilo Tilapia (Oreochromis niloticus)

Zootechnical Performance Evaluation of the Use of Biofloc Technology in Nile Tilapia Fingerling Production at Different Densities

Carbon Sources and C:n Ratios on Water Quality for Nile Tilapia Farming in Biofloc System

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