scholarly journals CARBON SOURCES AND C:N RATIOS ON WATER QUALITY FOR NILE TILAPIA FARMING IN BIOFLOC SYSTEM

2017 ◽  
Vol 30 (4) ◽  
pp. 1017-1027 ◽  
Author(s):  
UGO LIMA SILVA ◽  
DARIO ROCHA FALCON ◽  
MAURÍCIO NOGUEIRA DA CRUZ PESSÔA ◽  
EUDES DE SOUZA CORREIA
Keyword(s):  
Water Quality ◽  
Carbon Source ◽  
Nile Tilapia ◽  
C:N Ratio ◽  
Carbon Sources ◽  
Quality Parameters ◽  
Randomized Experimental Design ◽  
Biofloc Technology ◽  
The Stability ◽  
Different Sources

ABSTRACT 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.

The Effect of Biofloc Technology on Nursery System of Litopenaeus vannamei

2015 ◽  
Vol 737 ◽  
pp. 358-361
Author(s):  
Qian Ling Chen ◽  
Rui Jie Zhang ◽  
Ying Hui Wang ◽  
Yong Zhen Zhao ◽  
Jian Hua Chen ◽  
...  
Keyword(s):  
Water Quality ◽  
Carbon Source ◽  
Heterotrophic Bacterium ◽  
Seedling Emergence ◽  
Water Quality Control ◽  
Nursery Culture ◽  
N Concentration ◽  
Control Growth ◽  
Biofloc Technology ◽  
Cassava Residue

The cassava residue was selected as carbon source to study the effect of biofloc technique (BFT) on water quality control, growth performance and seedling emergence in a 40 L culture water of litopenaeus vannamei nursery culture system. The BFA groups included Graded level of C/N (15/1, 20/1 and 25/1) with three parallel samples, compared to the control groups. At the end of the feeding trial 15 days, 10.7%, 14.4% and 46.8% significantly decreased in NH4+-N concentration of the graded level of C/N (p<0.05); 80.2%, 96.0% and 96.2% distinctly decreased in NO2--N concentration (p<0.05); 81.4%, 57.8%, 151% obviously increased on seedling emergence (p<0.05) and 52.2%, 80.8%, 18.2% obviously increased on body weight (p<0.05). The present study elucidates that in the nursery system adding cassava residue as carbon source the culture water quality was evidently improved and heterotrophic bacterium, phytoplankton and zooplankton was also effectively obviously promoted.

scholarly journals Application of Water Quality Index for the Assessment of Water from Different Sources in Nigeria

2021 ◽  
Author(s):  
Ruth Olubukola Ajoke Adelagun ◽  
Emmanuel Edet Etim ◽  
Oko Emmanuel Godwin
Keyword(s):  
Water Quality ◽  
Water Quality Index ◽  
Quality Index ◽  
Quality Parameters ◽  
Quality Data ◽  
Water Quality Data ◽  
The Public ◽  
Multiple Test ◽  
Single Number ◽  
Different Sources

Water quality index (WQI) provides a single number that expresses the overall water quality, at a certain location and time, based on several water quality parameters. The objective of WQI is to turn complex water quality data into information that is understandable and usable by the public. A number of indices have been developed to summarize water quality data in an easily expressible and easily understood format. The WQI is basically a mathematical means of calculating a single value from multiple test results. This chapter discusses, in detail, the application of a water quality index for the assessment of water quality to different several water sources in Nigeria.

Assessment of water Quality Parameters During a Course of Applying Biofloc Technology(BFT)

2020 ◽  
Vol 32 (6) ◽  
pp. 1632-1638
Author(s):  
Ji Yong CHOI ◽  
Jun Seong PARK ◽  
Hyeongsu KIM ◽  
Ju-ae HWANG ◽  
Donggil LEE ◽  
...  
Keyword(s):  
Water Quality ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Biofloc Technology

scholarly journals Use of probiotics Bacillus cereus var. toyoi and Bacillus subtilis C-3102 in the diet of juvenile Nile tilapia cultured in cages

2017 ◽  
Vol 43 (3) ◽  
pp. 601-606
Author(s):  
Nilton Garcia-Marengoni ◽  
Milton Cézar de Moura ◽  
Newton Tavares Escocard De Oliveira ◽  
Robie Allan Bombardelli ◽  
Daniele Menezes-Albuquerque
Keyword(s):  
Water Quality ◽  
Bacillus Subtilis ◽  
Bacillus Cereus ◽  
Proximate Composition ◽  
Nile Tilapia ◽  
Basal Diet ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Gut Colonization ◽  
Hematological Profile

This study aimed at evaluating the gut colonization by probiotics, the influence on the bacterial microflora, hematological profile, fish performance, rates body and proximate composition and water quality parameters in the cultivation of Nile tilapia juvenile of the Genetically Improved Farmed Tilapia (GIFT) strain. 1800 fry were randomly distributed into four experimental groups (T1 = basal diet (BD) without probiotic addition, T2 = BD + 0.5 % Bacillus cereus var. toyoi (BC), T3 = BD + 0.5% Bacillus subtilis C-3102 (BS); T4 = BD + 0.25 % BC + 0.25 % BS) with five replicates. Cages (0.175 m3) containing 90 tilapia fry (0.34 ± 0.06 g), were used as culture units and individually installed in 8.4 m3 ponds. Except for hemoglobin, hematocrit, glucose, and neutrophil levels, no differences in hematological profile were observed among the groups after 127 days of culture (P > 0.05). The probiotic bacteria either added individually or in combination, successfully colonized the intestines of the fish, without negatively influencing the intestinal bacterial microflora, growth rate, proximate composition, or water quality parameters (P > 0.05). Thus, dietary probiotic supplementation of juvenile Nile tilapia alters the hematological profile, especially hemoglobin, hematocrit, glucose, and neutrophil levels.

scholarly journals Prevalence of parasitic infections on cultured Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) In Bong County, Liberia

2021 ◽  
Vol 62 (1) ◽  
pp. 13-25
Author(s):  
S. Addo ◽  
S. Mullah ◽  
P. K. Ofori-Danson ◽  
S. K. K. Amponsah ◽  
J. O. Nyarko
Keyword(s):  
Water Quality ◽  
Relative Abundance ◽  
Oreochromis Niloticus ◽  
Prevalence Rate ◽  
Nile Tilapia ◽  
Quality Parameters ◽  
Water Quality Parameters ◽  
Parasitic Infections ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Fish Samples

This study investigated the prevalence rate, relative abundance and mean intensity of par­asites infecting cultured Nile tilapia Oreochromis niloticus L. in three fish farms, Gbarnga, Warta and CARI in Bong County, Liberia. Organs from thirty fish samples were exam­ined from September 2016 to February 2017, along with water quality parameters. Results showed the occurrence of seven parasites including protozoans, monogeneans, digeneans, cestodes, hirudineans, nematodes and crustaceans which were organ specific in terms of infection. The prevalence of the parasites varied seasonally, with the highest numbers oc­curring in November-January. The low prevalence rate, relative abundance and mean in­tensity of the parasites showed no threat to fish farmers in Liberia. All the water quality parameters were at desirable levels for the culture of the fish except nitrite, which was beyond the threshold for sustainable fish culture. It is therefore concluded that although parasitic infections in the three farms in the Bong County were low, best farm management practices are essential.

scholarly journals Aplikasi teknologi bioflok (BFT) pada kultur ikan nila, Orechromis niloticus)

2016 ◽  
Vol 4 (2) ◽  
Author(s):  
Frandy Ombong ◽  
Indra R.N Salindeho
Keyword(s):  
Growth Rate ◽  
Nile Tilapia ◽  
Quality Parameters ◽  
Total Biomass ◽  
Daily Growth ◽  
Individual Fish ◽  
Nile Tilapia Oreochromis Niloticus ◽  
Biofloc Technology ◽  
The Individual ◽  
Very High

This study was aimed to find out the growth rate of Nile Tilapia (Oreochromis niloticus) cultured with biofloc technology, and to understand the dynamic of several water quality parameters during culture period. This experiment was conducted in the Laboratory of Aquaculture Technology, FPIK, UNSRAT.  Several substances were added to stimulate the development of biofloc, which were: 0,3 mL of EM-4 containing probiotic-bacteria Lactobacillus casei dan Saccharomyces cerevisiae.; 15 mL of mollases;  0,5 g of  yeast commonly used to ferment soybean ; 12 g of dolomite.    60 seeds of  nile tilapia,  with an individual weight of 6 g, were stocked in each container.   Fish were fed at a dose of 3% of the total biomass/day at the first week, and the dose was decreased  down to 1% of the total biomass per day afterwards.  Fish were weighed at day-1, day-15 and day-30.   The change of water color and the density of the floc was consistently evaluated using imhoff-cone. The initial weight of the tested individual fish were 6,00 g. After 15 days, the weight was increased to 7,37g, and at the end of the experiment the individual fish weighed 11,47 g. Hence, the absolut growth of the tested fish was 5,47g,  the specific growth rate was 91% and the daily growth rate was 2,11%.    The density of flok reached 9,5 mL/L at the beginning of the second week, which was categorized as very high density.   The density of floc then was decreased to 4 mL/L.   The density of the floc was maintained around 5 mL/L during the experiment. The temperature of the medium was at the range of 26-300C.  The level of ammonia was 0,03mg/L and  the level of  nitrite fluctuated between 0,15-3mg/L, which is normal and safe for biofloc system.  The level of nitrate was 4-55 mg/L, which was quite high for biofloc system but not harmful for fish.   Keywords:  Biofloc, Nile-Tilapia, growth, floc-density

scholarly journals Finger millet as a carbon source for biofloc, improved growth performance of Pangasianodon hypophthalmus (Sauvage, 1878) fingerlings

2020 ◽  
Vol 67 (4) ◽  
Author(s):  
P. Nageswari ◽  
A. K. Verma ◽  
Subodh Gupta ◽  
A. Jeyakumari
Keyword(s):  
Carbon Source ◽  
Finger Millet ◽  
Carbon Sources ◽  
Hepatosomatic Index ◽  
Feed Conversion ◽  
Efficiency Ratio ◽  
Pangasianodon Hypophthalmus ◽  
Growth Performances ◽  
Biofloc Technology ◽  
Average Body

A 90-days experiment was conducted to investigate the effects of biofloc produced with different carbon sources on growth performances, survival and body indices of Pangasianodon hypophthalmus fingerlings (average body weight: 6.4±0.05 g). The different carbon sources used in the experiment employing biofloc technology (BFT) were BFT-T (tapioca), BFT-S (sorghum), BFT-PM (pearl millet), BFT-FM (finger millet) and clear water with no addition of carbon source was treated as control. At the end of the experiment, significantly (p<0.05) higher weight gain (24.34±0.50 g), Specific growth rate, SGR (1.37±0.02% day-1); Feed efficiency ratio, FER (0.47±0.01); Protein efficiency ratio, PER (1.47±0.03) and lower Feed conversion ratio, FCR (2.12±0.03) were witnessed in the group where finger millet was used as a carbon source (BFTFM) and significantly lower responses were noticed in the control (CW). Results showed that there were no significantdifferences (p>0.05) in hepatosomatic index and viscerosomatic index of fish between the different experimental groups. During the termination of the experiment, no mortality was seen among the different experimental groups. Based on the results acquired from this study, finger millet could be used as an ideal carbon source for biofloc to augment the growth and productivity of P. hypophthalmus under farming.

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