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Latin american journal of aquatic research

On-line version ISSN 0718-560X

Lat. Am. J. Aquat. Res. vol.43 no.2 Valparaíso May 2015

http://dx.doi.org/10.3856/vol43-issue2-fulltext-13 

Research Article

 

Quantification of intestinal bacteria, operating cost and performance of fingerlings Nile tilapia subjected to probiotics

Cuantificación de las bacterias intestinales, costo de operación y desempeño de alevines de tilapia del Nilo sometido a probióticos

 

Nilton Garcia-Marengoni1 & Daniele Menezes-Albuquerque2

1 Universidade Estadual do Oeste do Paraná (Unioeste) Marechal Candido Rondon, 85960-000, Paraná, Brasil
2
Universidade Federal da Grande Dourados (UFGD), Mato Grosso do Sul, Brasil
Corresponding author: Nilton Garcia-Marengoni (nmarengoni@hotmail.com)


ABSTRACT. The use of microorganisms of the genus Bacillus in aquaculture is a nutritional management practice that is rapidly expanding in regions with intensive fish farming. This study aimed to quantify the total bacteria and total coliforms from the intestinal microbiota and estimate the partial operating costs and growth performance of Nile tilapia (Oreochromis niloticus) of the GIFT strain. A total of 1,200 post-larvae (24.7 ± 0.50 mg) were distributed into 24 aquaria (0.03-m3 capacity) within a completely randomized design in 2 x 3 factorial (phase x bacteria), with four replications. Each aquarium, containing 50 post-larvae (sex reversal phase) or 30 fish (fingerlings phase), it was considered to be an experimental unit, consisting of three treatments (diet+Bacillus subtilis C-3102, diet+Bacillus cereus var. toyoi and diet without probiotic addition). The quantification of the total bacteria and total coliforms of the intestinal microbiota of tilapia were influenced (P < 0.05) by the stages of culture. The bacterial count was not influenced (P > 0.05) by adding probiotics in the diets and no effect of the interaction between phase and bacteria was observed. The weight gain, average daily weight gain, specific growth rate and apparent feed conversion were not affected (P > 0.05) by inclusion of probiotics as part of the diets. The inclusion of B. subtilis and B. cereus as part of diets for Nile tilapia promotes intestinal colonization and improves the survival rate without negatively influencing the feed intake, total biomass, gross revenue and partial operating costs and net revenue. Therefore it recommends the use of these probiotics to growth of tilapia fingerlings Nile, GIFT strain.

Keywords: economic analysis, microbiology, tilapia culture, probiotics, aquaculture.


RESUMEN. El uso de microorganismos del género Bacillus en la acuicultura es una práctica de manejo nutricional que se está expandiendo rápidamente en las regiones con la piscicultura intensiva. Este estudio tuvo como objetivo cuantificar las bacterias totales y coliformes totales de la microbiota intestinal y estimar los costos operativos parciales y comportamiento productivo de la tilapia del Nilo (Oreochromis niloticus) de la cepa GIFT. Un total de 1.200 post-larvas (24,7 ± 0,50 mg) fueron distribuidas aleatoriamente en 24 acuarios (capacidad 0,03 m3) en un diseño completamente al azar en factorial 2 x 3 (fase x bacterias), con cuatro réplicas. Cada acuario, que contiene 50 post-larvas (fase de inversión sexual) o 30 peces (fase de alevines), se consideró como una unidad experimental, que consta de tres tratamientos (dieta+Bacillus subtilis C-3102, la dieta+Bacillus cereus var. toyoi y dieta sin adición de probiótico). La cuantificación de las bacterias totales y coliformes totales de la microbiota intestinal de tilapia fueron afectados (P < 0,05) por las etapas del cultivo. El recuento de bacterias no fue afectado (P > 0,05) mediante la adición de probióticos en la dieta y no se observó efecto de la interacción entre fase y bacterias. El aumento de peso, ganancia diaria de peso promedio, tasa de crecimiento específico y conversión alimenticia aparente no se vieron afectados (P > 0.05) por la inclusión de probióticos en las dietas. La inclusión de B. subtilis y B. cereus como parte de dietas para tilapia del Nilo promueve la colonización intestinal y mejora la tasa de supervivencia sin influir negativamente en el consumo de alimento, biomasa total, ingresos brutos y costos operativos parciales e ingresos netos. Por lo tanto, se recomienda el uso de estos probióticos para el crecimiento de alevines de tilapia del Nilo de la cepa GIFT.

Palabras clave: análisis económico, cultivo de tilapia, microbiología, probióticos, acuicultura.


 

INTRODUCTION

Probiotics are living microorganisms that are used as dietary additives; they live in the gastrointestinal tract of the host, adhering to the epithelial wall and proliferating in the intestine. Probiotics may act in the reduction and prevention of infection by pathogens by improving the intestinal bacterial flora, thus reducing the load of harmful bacteria by producing inhibitory substances, and assisting in digestion by producing digestive enzymes and further stimulating the immune system. If they will be used as dietary supplements, they should be able to survive for long periods of storage (Saad, 2006; Sahu et al., 2008; Cutting, 2011; Cruz et al., 2012; Mohapatra et al., 2013).

The tilapia culture generates jobs and income and it has been considered a strong sector in food production in Brazil and tropical places. The productions of large-scale commercial demand a high density of fish stocked, and therefore is common the emergence of diseases caused by stress during cultivation, entailing in a high mortality and economic losses to producer. The minimization of these problems has fostered several studies in last years, looking for changes of the antibiotics in animal production, especially in aquatic organisms culture (Nayak, 2010).

It is noteworthy that the use of probiotics in aquaculture deserves an important highlight on the economic evaluation, within view of the producer can get profitably environmental sustainably a quality fish. Bacillus cereus var. toyoi and B. subtilis C-3102 are products approved by the European Food Safety Authority (EFSA). These probiotics have been recently used in Nile tilapia (Albuquerque, 2011; Moura, 2011; Albuquerque et al., 2013; Mello et al., 2013; Nakandakare et al., 2013; Wild et al., 2014) and shrimp research (Silva et al., 2011; Souza et al., 2012).

The B. subtilis and B. cereus are great candidates probiotics used in aquatic organisms, because according to El-Haroun et al. (2006) this bacterial species can be lyophilized and thus are, capable to survive in high temperatures, such as; after the pelleting process, it can be stored at room temperature without any deleterious effect, and resisted to the low pH that can reach intact to the small intestine (Cutting, 2011), although further development of this technique is required.

This study aimed to quantify total bacteria and total coliforms from the intestinal microbiota and estimate the partial operating costs and productive performance of fingerlings of Nile tilapia of the Genetically Improved Farmed Tilapia (GIFT) strain, fed diets under inclusion of probiotic B. cereus var. toyoi and B. subtilis C-3102.

MATERIALS AND METHODS

The experiment was performed at the Aquaculture Laboratory of West Paraná State University, Unioeste/Toledo, Paraná, Brazil, from March 2010 to June 2010. Microbiological analyses were carried out in the Laboratory of Microbiology at the Catholic University of Parana, PUCPR/Toledo, over 113 days of cultivation that was divided in the sex reversion and fingerling phases.

A total of 1,200 Nile tilapia post-larvae (Oreochromis niloticus) of the GIFT strain, with an initial average weight of 24.7 ± 0.50 mg were used. Post-larvae were distributed into 24 aquaria (0.03-mcapacity) in a completely randomized design, comprising in 2 x 3 factorial (phase x bacteria), with four replications. Each aquarium, containing 50 post-larvae (sex reversal phase) or 30 fish (fingerlings phase) it was considered to be an experimental unit, consisting of three treatments (diet+Bacillus subtilis C-3102, diet+Bacillus cereus var. toyoi and diet without probiotic addition).

The fish were reversed sexually, adding in experimental diets the synthetic androgen 17 α-methyltestosterone, by volatilization of ethanol at a concentration of 60 mg kg-1. The fish were fed ad libitum six times a day and at the end of the day, all aquaria were siphoned to remove any residues.

Initially, during the sex reversal phase was considered an experimental unit an aquarium (0.03-mcapacity) containing 50 post-larvae and in the final period of sex reversal were removed 20% of majors and minors around the mean of the average individual weight of fish with intent to homogenize, the batch for the fingerlings phase. At the beginning of the fingerlings culture, there was a decreased of stocking density for an aquarium containing 30 fish.

A probiotic containing 500 million spores per gram, B. subtilis C-3102 (Comércio e Indùstria Uniquimica Ltda.) or B. cereus var. toyoi (Sumitomo Chemical do Brazil Ltda.) was used as growth promoters of fish performance. In the diets, which contains probiotic it was added 1% of the product when the ingredients was mixed (Table 1).

 

Table 1. The percentage of composition and chemistry of experimental diets for Nile
tilapia grown during the sex reversal and fingerlings culture.

(1)Mineral and Vitamin Premix: Composition per kg of product: iron: 10.312 mg,
Mn: 6.875 mg, cooper: 1.100 mg, zinc: 16.500 mg, iodo: 137 mg, cobalt: 82.50 mg,
selenium: 124.00 mg, chrome: 68.75 mg, vit. A: 1,100.000 UI; vit. D3: 344.000 UI;
vit.: E: 27.500 mg; vit. K: 1.375 mg; vit. C: 41.250 mg; biotin: 130.50 mg;
choline: 75.625 mg; vit. B9: 825.00 mg; inositol: 27.500 mg; niacin: 13.750 mg;
vit. B5: 6.875 mg; vit. B6: 2.063 mg; vit. B2: 2.750 mg; vit. B1: 2.750 mg
and vit. B12: 4.120 mg.

 

It were collected randomly at the end of the sexual reversion and fingerlings phase, one gram of intestines of each experimental unit, in order to quantify the total number of bacteria, total coliforms bacteria, and colonization by probiotics per gram of intestine.

The intestines removed aseptically were weighed and diluted in 1 mL of sterile distilled water per gram of intestine in a test tube, and subsequently homogenized in vortex. Decimal dilutions were performed in sterile distilled water pipes (10-1, 10-2, 10-3 and 10-4) from the homogenized material. The agar medium pattern count (PCA) and Mc Conkey agar (MAC) were used to quantify total bacteria and coliforms bacteria, respectively.

The agar medium selective differentiator for Bacillus was used in Petri dishes with 1 mL of dilute solutions of 10-1, 10-2, 10-3 and 10-4 for verify the presence of B. subtilis C-3102 and B. cereus var. toyoi. The duly prepared Petri dishes were incubated in a greenhouse microbiological at 28°C for 24 h. The colonies of bacteria were quantified with the aid of electronic colony counter marks Phoenix CP 600 Plus Electronic, using the official analytical methods for microbiological analysis for control of animal products and water, proposed by the Ministry of Agriculture, Livestock and Supply (Brasil, 2003).

It was used an adaptation of the mathematical model described by Silva et al. (2003) for the economic analysis of the production of tilapia fed with probiotics that considers the costs of acquiring fingerlings and feed prices and gross commercialization of fish. 1) OCP = [(FI x PR) + (NF x UPF)], 2) GR = PP x TB, 3) IC = OCP/TB; 4) = NIP = GR - OCP, wherein: OCP: operating costs partial , FI: feed intake, PR: price per kg diet-1; NF: initial number of fingerlings, UPF: unit price of fingerlings; GR: gross revenue, TB: total biomass; PP: purchase price of the fish, IC: incidence of cost; NIP: net income partial.

The normality of experimental errors and homogeneity of variance for each trait were previously evaluated using the Shapiro-Wilk and Levene tests, respectively. The microbiological data, it is partially operating costs and productive performance were subjected to analysis of variance (ANOVA) and Tukey’s test (α = 0.05) when significant differences were detected (StatSoft, 2005).

RESULTS

It is observed on the Table 2 that the quantification of the total bacteria and total coliforms of intestinal microbiota of tilapia were influenced (P < 0.05) by the stages of culture. The number of colony forming units was lower in the sex reversal phase compared to the fingerlings phase.

 

Table 2. Mean values and standard deviation (log CFU mL-1) of total bacteria, coliforms,
presence (+) or absence (-) of Bacillus in Nile tilapia fed with different probiotics during
periods of sex reversal and fingerlings phases. F: variable test, P: critical values.

 

The count (log CFU mL-1) of total bacteria ranged between 4.85 for the fish fed without addition of probiotic in the diet formulation and 5.54 for diet with B. cereus. The total bacteria and total coliforms of intestinal microbiota of Nile tilapia were not influenced (P > 0.05) by adding probiotics in the diets. There was not observed effect of interaction between phase and bacteria during tilapia fingerlings culture (Table 2).

It was observed the presence of Bacillus in all treatments. Whereas Bacillus are bacteria Gram positive cosmopolitan which can be isolated from various habitats as water, soil air, then, possibly the fishes which there were not fed with probiotic, it may have exposed by another transmission, such as within ingredient in the diet it contained the genus Bacillus, external manipulation or even water in which the fish were cultured.

The addition of probiotic B. cereus var. toyoi or B. subtilis C-3102 in the diet did not influence (P > 0.05) weight gain (WG), daily weight gain (DWG), specific growth rate (SGR) and apparent feed conversion (AFC) of Nile tilapia fingerlings (Table 3).

 

Table 3. Mean values and standard deviations of economic variables in the cost of production
of Nile tilapia fed different probiotics. F: variable test, P: critical values.

(##) The price according to weight/thousand (g) data Atoaqui - Associajao Toledana
de Aquicultura haverst/2010-2011 in Toledo, Paraná, Brazil; (1)Weight Gain (WG), (2)Daily
Weight Gain (DWG), (3)Specific Growth Rate (SGR), (4)Gain in Biomass (GB), (5)Apparent
Feed Conversion (AFC), (6)Survival Rate (SUR), (7)Total Feed Consumption (TFC), (8)Price
per kg diet-1 (pR), (9)Unit Price of Fingerlings (UPF), (10)Selling Price of Fingerlings (SPF)
(11)Biomass Total (BT) (12)Gross Revenue (Gr) (13)Operating Cost Partial (OCP), (14)Net
Income Partial (NIP) (15)Incidence of cost (IC).

 

The gain in biomass was significantly higher (P < 0.05) in the fish group fed a diet containing B. subtilis than in the group lacking probiotics, however, no differences were observed when compared with fish fed with B. cereus. There were no differences of gain in biomass between fish fed with B. cereus and treatment without probiotics (Table 3).

The survival values were greater (P < 0.05) in the fish group fed, adding probiotic B. cereus var. toyoi or B. subtilis C-3102 in relation to the group fed probioticfree (Table 3). It is noted that the fish fed B. cereus or B. subtilis resulted a higher biomass of fingerlings compared to those that not fed with probiotics (P < 0.05). The feed intake was not affected by the addition of probiotic B. cereus var. toyoi or B. subtilis C-3102 in diet for Nile tilapia fingerlings (P > 0.05).

Gross revenues of the fingerlings cultivation of Nile tilapia was highly influenced (P < 0.01) by use of probiotics in food, where the revenues from the sale of the fish ranged between 64.18 and 95.41, respectively, for the fish group lacking probiotic and fed adding B. subtilis (Table 3).

The partial operational costs arising with feed costs showed that, the price of the post-reversed fingerlings was affected significantly (P < 0.05) by treatment which in its formulation contained B. subtilis in relation to fishes did not fed with probiotics. However, the partial operational costs of fishes fed with B. cereus did not differ significantly from the group fed with B. subtilis and probiotic-free. The values in this economic parameter did not promote a return satisfactory. Probably this is due to the final biomass together with survival of the fingerlings obtained at the end of cultivation. Wild et al. (2014) evaluating the economic viability of adding probiotic in the Nile tilapia diet found that use of B. cereus showed higher return on investment that the use of B. subtilis or the combination B. cereus and B. subtilis, as part of diets for tilapias.

Body weight and length of fish at the end of fingerlings culture showed geometrical behavior that was expressed by the regression equations (y = 0.1078x4.1817; R2 = 0.82; y = 0.209x3.1023; R2 = 0.69 and y = 0.1018x4.2136; R2 = 0.92), respectively for fish diets that did not contain probiotic B. subtilis and B. cereus (Fig. 1). The determination coefficient (R2) of the weight and length relation represents the proportion the correlation resulting of casual factors, ranged between 0.69 and 0.92 for the fishes that were not fed by probiotics and B. cereus. These results are important and can interfere in a productive performance, aiming to provide fishes more uniforms and get a better use at the time of marketing, because the interaction of the fishes larger about the smaller promotes a hierarchy resulting in a variation of the cultivated lots.

 

Figure 1. Weight curves (g) and length (cm) of fingerlings
Nile tilapia probiotic-free (a), Bacillus subtilis (b),
and Bacillus cereus (c).

 

According to Fox et al. (1997), elevated cortisol levels may induce alterations in the production of growth hormone (GnRH), therefore, explains the difference in the weight and size between individuals of the same lot. Therefore, the dominant fishes tend to form feeding zones the incumbent subordinates to feed, therefore increasing the range of fish size.

DISCUSSION

Jatoba et al. (2008) while studying the isolation of lactic acid bacteria of the intestine of tilapia through probiotics potential, they observed values of total bacteria different to those found in the present study in which varied between 6.35 and 8.06 log CFU mL-1.

The addition of probiotic B. cereus var. toyoi and B. subtilis C-3102 did not influence (P > 0.05) the weight gain, average daily weight gain, specific growth rate and feed conversion of Nile tilapia juvenile (Table 3). Like the present study, Marengoni et al. (2010), using B. subtilis, B. pumilus and B. lincheniformis as probiotic in diets for red tilapia fingerlings, found similar results whose probiotics did not influenced the production performance and survival. Albuquerque (2011) and Moura (2011) also found no differences in the addition of probiotics in diets on performance of Nile tilapia fingerlings of GIFT strain.

Probably the time of use of probiotics has influenced in the total bacteria count during cultivation. In addition, the probiotics used in vivo were isolated from gut of the fishes of the same population that would be subsequently subjected to a challenge, as opposed to what was done in this study. Together with this hypothesis, these values may have been different due to the inhibition mechanisms by competitive exclusion for nutrients, space or specificity relationship probiotic-host, as reported by Gomez-Gil et al. (2000).

In relation to incidence of cost it was found that, it was no significant differences between the treatments containing probiotic or not in formulation (P > 0.05). The values of incidence of cost are not in accordance with those observed by Marengoni et al. (2008) and when evaluated the different stocking densities upon performance and economic viability of juvenile Nile tilapia in western Paraná, it were obtained in this parameter a variation of values between 0.67 and 2.00, resulting this, due to the higher biomass obtained at the end of cultivation.

Similarly, Olvera-Novoa et al. (2002) which studying the utilization of Candida utilis as protein source for tilapia fingerlings they obtained a minimum value of 2.24 whereas that, within this study they showed values of 1.09 and 2.64, respectively for maximum and minimum incidence of cost (Table 3).

Taking into consideration that there were no significant differences (P > 0.05) in feed consumption of fingerlings that contained B. subtilis in the formulation and, more expressive values of total biomass and gross income (P < 0.05), generating a lesser of cost incidence it is possible recommend the utilization of this probiotic for fingerlings the Nile tilapia, with particular emphasis on environmental sustainability of fish farming (Wild et al., 2014).

CONCLUSIONS

The inclusion of Bacillus subtilis C-3102 and Bacillus cereus var. toyoi in diets for Nile tilapia fingerlings of the GIFT strain promotes intestinal colonization and can be recommended in the cultivation of this species during sex reversal and fingerlings phases.

The inclusion of B. subtilis and B. cereus as part of diets for Nile tilapia promotes intestinal colonization and improves the survival rate without negatively influencing the feed intake of the fingerlings, total biomass, gross revenue and partial operating costs and net revenue. Therefore it recommends the use of these probiotics in growth of fingerlings Nile tilapia, GIFT strain.

ACKNOWLEDGEMENTS

The authors thank to "Coordenação de Aperfeiçoamento de Pessoal de Nivel Superior (CAPES)" by partially grant funding for the research. The authors are also thankful to Mr. Milton Cézar de Moura (PUC/PR) and Mr. Ilson Mahl (Copacol/PR) for supporting during the research period.

 

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Received: 29 June 2013;
Accepted: 2 March 2015

 

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