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Latin american journal of aquatic research

versión On-line ISSN 0718-560X

Lat. Am. J. Aquat. Res. vol.48 no.1 Valparaíso mar. 2020

http://dx.doi.org/10.3856/vol48-issue1-fulltext-2365 

Research Article

The effect of tilapia Oreochromis niloticus addition on the sediment of brackish low-salinity ponds to white shrimp Penaeus vannamei farming system during the wet and dry season

Jorge Juárez-Rosales1 

Alma D. Román-Gutiérrez1 

Elena M. Otazo-Sánchez1 

Griselda Pulido-Flores1 

Héctor M. Esparza-Leal2 

Eugenio A. Aragón-Noriega3 

Alireza Seidavi4 

1Instituto de Ciencias Básicas e Ingeniería, Área Académica de Química, Posgrado en Ciencias Ambientales Universidad Autónoma del Estado de Hidalgo, Pachuca, Hidalgo, México

2Instituto Politécnico Nacional, Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional Unidad Sinaloa, Guasave, Sinaloa, México

3Centro de Investigaciones Biológicas del Noroeste S.C., Guaymas, Sonora, México

4Islamic Azad University, Rasht Branch, Rasht, Iran

ABSTRACT

The present study was carried out to determine the effect of tilapia Oreochromis niloticus on the physical and chemical sediment parameters on an earthen pond in monoculture (shrimp Penaeus vannamei) and co-culture (tilapia-shrimp) during the dry and wet seasons in a commercial farm during the period from mid-September to end-December 2017 and February to mid-May 2018. Chemical and physical analyses were realized on sediment samples from brackish water ponds representing shrimp farms in San Blas Nayarit, Mexico. Concentrations of organic carbon, nitrogen, potassium, magnesium and calcium were higher in co-culture ponds, and there was a tendency to a higher concentration of phosphorus and sodium in the sediment of monoculture ponds. The texture of the ponds showed a tendency in the dry season to increase the percentage of clay in co-culture due to the effect of bioturbation caused by tilapia. There was no evidence of poor development of sediment quality in any treatment. It was found that tilapia was a factor that affected sediment quality, differences in growth between shrimp monoculture and tilapia-shrimp co-culture can be explained, at least in part, by differences in their sediment.

Keywords: Oreochromis niloticus; Penaeus vannamei; sediment; co-culture; brackish pond

INTRODUCTION

The addition of tilapia to shrimp ponds has been used to improve water and sediment quality and shrimp production, compared to shrimp monoculture (Fitzsimmons & Shahkar, 2017). Tilapia has been cultivated with a variety of fish and crustaceans under co-culture conditions mainly to improve production and have better environmental control of the farming system (Milstein & Hernández, 2017). The co-culture of tilapia with white shrimp Penaeus vannamei, has been shown to improve production and nutrient utilization in relation to shrimp monoculture, obtaining a better profitability and less environmental contamination (Sun et al., 2011; Bessa et al., 2012; Hernández-Barraza et al., 2013; Fitzsimmons & Shahkar, 2017; López-Gómez et al., 2017). It encourages the development of bacterial communities, fungi, algae and bioflocs of the native biota of the shrimp where the co-culture is carried out (Fitzsimmons & Shahkar, 2017), as in brackish low-salinity ponds. In the last years the co-culture of tilapia-shrimp has had a greater boom in small commercial farms of shrimp culture P. vannamei in Latin America among which are Brazil, Peru, Ecuador, Honduras and Mexico mainly, because it has been found that this culture strategy reduces diseases such as that caused by white spot shrimp virus, Vibrio harveyi and V. parahaemolyticus (Rodríguez-Grimón, 2003; Cruz et al., 2008; Tran et al., 2014). In the northwest of Mexico, most shrimp farms use the semi-intensive system in earthen ponds, where the southern Gulf of California farms are small 1 to 50 ha (Ponce-Palafox et al., 2011), where some follow the strategy of simultaneous polyculture system (tilapia and shrimp are grown together in a pond), which is common in other parts of the world (Fitzsimmons & Shahkar, 2017).

Studies on tilapia-shrimp co-culture have been carried focused on the effect upon water quality (Alam et al., 2008; Brito et al., 2017), feeding (Jatobá et al., 2011), density (Candido et al., 2005), growth performance (Hernández-Barraza et al., 2012), production (Wang & Lu, 2016), diseases (Dash et al., 2017) and profitability (Muangkeow et al., 2007). However, studies on the effects on soil-sediment are scarce, although it has been determined that conditions at the bottom of the pond have a strong influence on water quality and the production of shrimp (Sonnenholzner & Boyd, 2000).

In the sediment, shrimp spend the majority of the culture at the water-sediment interface, so a change in the sediment has direct effects on the shrimp (FAO, 2013), as well as the risk of contracting a bacterial disease (Nimrat et al., 2008). The conditions of sediment and water quality in shrimp farming earthen ponds determine their health and the success of the culture (Saraswathy et al., 2019). In this type of pond, sediment is formed on the ground composed mainly of a higher concentration of organic carbon originated from plankton, feces, balanced feed and fertilizer (Munsiri et al., 1995). What causes the nitrogen and phosphorus compounds are a higher concentration in the sediment than in the water column (Yang et al., 2019). It has been found that within the first 4 cm depth is the zone of the sediment where nitrogen and phosphorus are released and transported (Cheng et al., 2014) and where the effect of tilapia of omnivores-detritivores habits on the sediment can be better detected. There are many studies on water and sediment quality of Oreochromis niloticus (Ram et al., 1982; Avnimelec et al., 1999; Adámek & Maršálek, 2013; Fan et al., 2017; Omofunmi et al., 2016) and L. vannamei (Nimrat et al., 2008; Joyni et al., 2011; Van Duc et al., 2018; Yang et al., 2019) in ponds. However, there are few studies on the effect of tilapia-shrimp co-culture in rustic ponds at different times of the year. Therefore, this study aimed to determine the effect of tilapia O. niloticus on the physical and chemical soil parameters on an earthen pond in mono and co-culture with white shrimp during the dry season (concentration conditions) and rainfall season (dilution conditions) in a commercial farm.

MATERIALS AND METHODS

Study area

The experiment was carried out at Chiripa, San Blas Nayarit, northwest coast of Mexico (21°37'34.53”N, 105°18'16.31”W). The mean temperature of the environment was from 22-26°C (García, 2004). The earthen ponds have a surface area from 2.75 to 3.2 ha and 1.2 m deep. The ponds use water from a canal with salinity from 8.5 to 18.4, depending on the time of year.

Experimental animals

Post-larval (PL15) white shrimp (Penaeus vannamei) mean initial weight = 0.001 ± 0.001 g were bought from a commercial hatchery, located in the Bay of Matanchen, municipality of San Blas, Nayarit, called “Acuacultura Integral, S.A. de CV.” All the tilapia (5.0 ± 0.6 g) were transported from fingerling commercial hatchery “Genetilapia SA de CV,” located at Rosario Sinaloa, Mexico.

Experimental design

Two trials were carried out using a completely randomized design consisting of two treatments (wet and dry season) with three replications (ponds) for each. The first trial takes 106 days of mid-September to end-December 2017 (wet season), and the second trial took the same time as the first and was of February to mid-May 2018 (dry season). Treatments were shrimp monoculture wet season (SMW) and dry season (SMD) and tilapia-shrimp co-culture wet season (TSW) and dry season (TSD). Shrimp were stocked (10 ind m−2) in monoculture ponds for all treatments; tilapia (4 ind m−2) and shrimp (10 ind m−2) were stocked in co-culture ponds. First, the shrimp were stocked, and then the tilapia was added seven days later directly in each of the ponds, in all cases. The shrimp and tilapia in each earthen pond were collected from a harvesting pit. The tilapia and shrimp were fed four times a day (07:00, 11:00, 15:00 and 19:00 h); commercial pellets for shrimp feed brand “Paymar”, with 40-20% (initial-final) and 10-20% (initial-final) protein and lipids, respectively, were used. The ponds were initially fertilized 10 days before shrimp and tilapia stocking with NutriLake-P® commercial fertilizer (5 kg ha−1 in each pond) for the growth of natural food organisms.

Sediment analysis

A kilogram of soil samples was collected from each tank at the initial and the end of the culture. In each pond, salinity (potential meter) and pH (Jackson, 1973, method) were determined. Organic matter (OM) was measured according to the procedures described in Rayment & Higginson (1992). Kjeldahl nitrogen was measured to determine total organic nitrogen (TN) in the soil according to the procedure described in Soil Survey Staff (2014). Total phosphorus (TP) was measured in soil extract obtained from perchloric digestion (Horwitz, 2002). Macronutrients such as calcium (Ca), magnesium (Mg), sodium (Na) and potassium (K) were analyzed by extraction with ammonium acetate pH = 7 modified (Woerner, 1989). A granulometry study was carried out according to Soil Survey Staff (1999) sieving the sediment sample and Pipette method (Day, 1965) was used to determine the following fractions: clay (CL) (<2 μm), silt (SI) (2-50 μm) and sand (SA) (50-2000 μm). Gravel fractions (>2 mm) were not detected. Other analyses were carried out on the fine fractions of the sediment (<2 mm) following the method used by Aldama-Rojas et al. (2011).

Statistical analysis

The results of sediment variables were checked using Levene's test for homogeneity of variances and Shapiro-Wilk's test for normality (Sokal & Rolhf, 2012). Differences between treatments were compared using one-way analysis of variance (ANOVA), and Tukey's test was applied to determine which treatments differed significantly. To determine the most important sediment parameters and the multivariate effects on the sampling sites, a correlation matrix, principal components, and discriminant analysis were performed. Data were analyzed using Statistica for Windows (version 5.5 Inc., USA).

RESULTS

In the wet season, no significant differences (P > 0.05) in pH were found between all sampling stations (Table 1). There were significant differences (P < 0.05) between the initial concentrations of OM, TN, TP, Mg and Na and those recorded at the end of the culture. The OM, TP, Mg, Ca, Na, SA, SI and CL concentrations were similar in the monoculture and co-culture system at the end of the experiment. Only significant differences (P < 0.05) were found in TN and K in the two strategies used, higher TN concentration and lower K in co-culture.

Table 1 Sediment variables in monoculture (shrimp Penaeus vannamei) and co-culture system (tilapia Oreochromis niloticus/shrimp) in water indoor pond water (IPW) during the wet season for 106 days. 

Parameter/Treatment Initial sediment Final sediment
SMW TSW SMW TSW
OM (%) 4.50 ± 2.10b 5.30 ± 2.10b 6.30 ± 1.80a 8.70 ± 1.60a
TN (kg ha−1) 156.00 ± 42.20d 312.00 ± 42.30b 275.00 ± 32.70c 405.00 ± 32.90a
TP (mg kg−1) 1,023.00 ± 345.10b 1,215.00 ± 341.20b 1,653.70 ± 170.10a 1,456.00 ± 173.20b
K (mg kg−1) 32.10 ± 7.00a 45.60 ± 13.50b 39.40 ± 7.20b 49.30 ± 13.90a
Mg (mg kg−1) 1,786.00 ± 176.60b 1,254.00 ± 252.40c 2,036.00 ± 175.20a 2,038.00 ± 259.10a
Ca (mg kg−1) 1.60 ± 0.51b 2.30 ± 0.31a 2.40 ± 0.52a 2.90 ± 0.29a
pH 7.80 ± 0.14a 7.50 ± 0.02a 7.60 ± 0.16a 7.60 ± 0.01a
Na (mg kg−1) 1,456.00 ± 394.50b 1,136.00 ± 528.40b 2,064.00 ± 391.20a 2,039.00 ± 516.30a
SA (%) 11.30 ± 0.27b 14.50 ± 0.60a 10.50 ± 0.29a 10.50 ± 0.20a
SI (%) 18.30 ± 7.10b 32.10 ± 2.70a 28.40 ± 7.30a 28.40 ± 2.30a
CL (%) 70.40 ± 6.70a 53.40 ± 4.40c 61.30 ± 6.10b 61.10 ± 4.10b

Values in each row with different superscript letters indicate significant differences between groups (P < 0.05). SMW: Shrimp monoculture wet season, TSW: Tilapia-shrimp co-culture wet season.

In the dry season, there were significant differences between the initial concentrations of OM, TN, K, Mg, Ca, pH, Na, SA, SI and CL and those recorded at the end of the culture (Table 2).

Table 2 Sediment variables in monoculture (shrimp) and co-culture system (tilapia/shrimp) in water indoor pond water (IPW) during the dry season for 106 days. 

Parameter/Treatment Initial sediment Final sediment
SMD TSD SMD TSD
OM (%) 5.70 ± 1.10b 8.20 ± 1.10b 10.00 ± 1.80a 12.00 ± 1.60a
TN (kg ha−1) 260.00 ± 2.20b 278.00 ± 2.30b 320.00 ± 2.70a 346.00 ± 2.90a
TP (mg kg−1) 940.00 ± 0.10b 540.00 ± 0.20c 1,255.20 ± 0.10a 792.70 ± 0.20b
K (mg kg−1) 20.64 ± 0.01b 15.12 ± 0.01c 29.92 ± 0.02a 32.74 ± 0.01a
Mg (mg kg−1) 2,423.00 ± 0.60b 2,563.00 ± 2.40b 3,292.00 ± 1.00a 3,891.00 ± 1.10a
Ca (mg kg−1) 1.42 ± 0.01b 2.30 ± 0.01a 2.10 ± 0.02a 2.40 ± 0.01a
pH 7.90 ± 0.01a 8.10 ± 0.02a 7.50 ± 0.06b 7.30 ± 0.01b
Na (mg kg−1) 3,036.00 ± 0.40b 2,530.00 ± 0.40c 5,632.00 ± 0.20a 5,280.00 ± 0.30a
SA (%) 19.30 ± 3.10b 15.30 ± 0.70b 24.90 ± 0.20b 24.90 ± 0.20b
SI (%) 35.30 ± 0.20a 39.30 ± 0.60c 67.30 ± 3.30a 65.20 ± 0.30a
CL (%) 45.40 ± 4.70a 45.40 ± 2.40b 7.80 ± 4.10c 9.90 ± 2.10c

Values in each row with different superscript letters indicate significant differences between groups (P < 0.05). SMD: Shrimp monoculture dry season, TSD: Tilapia-shrimp co-culture dry season. OM: organic matter, TN: organic nitrogen, TP: total phosphorus, K: potassium, Mg: magnesium, CA: calcium, pH: acidity, NA: sodium, SA: sand, SI: silt, CL: clay.

The OM, TN, K, Mg, Ca, pH, Na, SA, SI and CL concentrations were similar in the monoculture and co-culture system at the end of the experiment. Only significant differences were found in TP in the two strategies used, higher TP concentration in mono-culture. There was a tendency for the sediment of the co-culture system to have a higher percentage of clay.

In the wet season, the most significant proportional correlations were OM-TN, TP-pH-SI, K-Mg-Na-CL and Mg-Na, and inversely proportional between SA-SI. (Table 3). In the dry season, the most significant proportionally correlations were OM-TN, TP-pH, K-Mg and pH-Na (Table 4).

Table 3 Correlations matrix sediment parameters in monoculture (shrimp) and co-culture system (tilapia/shrimp) in all treatments during the wet season for 106 days. 

Variable OM TN TP K MG CA PH NA SA SI CL
OM 1.00
TN 0.77 1.00
TP 0.53 0.64 1.00
K 0.22 −0.23 −0.15 1.00
MG 0.34 0.21 0.47 0.72 1.00
CA −0.36 −0.22 −0.54 0.46 0.26 1.00
pH 0.5 0.33 0.75 0.23 0.53 −0.29 1.00
NA 0.26 0.06 0.09 0.77 0.72 0.58 0.56 1.00
SA −0.33 −0.27 −0.57 −0.21 −0.59 0.38 −0.14 0.12 1.00
SI 0.57 0.67 0.87 −0.15 0.44 −0.58 0.39 −0.17 −0.84 1.00
CL 0.22 −0.44 −0.24 0.77 0.29 −0.05 0.16 0.34 −0.15 −0.2 1.00

Correlations values in bold are significant at P < 0.05. OM: organic matter, TN: organic nitrogen, TP: total phosphorus, K: potassium, Mg: magnesium, CA: calcium, pH: acidity, NA: sodium, SA: sand, SI: silt, CL: clay.

Table 4 Correlations matrix sediment parameters in monoculture (shrimp) and co-culture system (tilapia/shrimp) in all treatments during the dry season for 106 days. 

Variable OM TN TP K MG CA PH NA SA SI CL
OM 1.00
TN 0.77 1.00
TP 0.53 0.64 1.00
K 0.22 −0.23 −0.15 1.00
MG 0.34 0.21 0.47 0.72 1.00
CA −0.36 −0.22 −0.54 0.46 0.26 1.00
pH 0.50 0.33 0.75 0.23 0.53 −0.29 1.00
NA 0.43 0.51 0.78 0.17 0.65 0.00 0.89 1.00
SA −0.33 −0.27 −0.57 −0.21 −0.59 0.38 −0.14 −0.16 1.00
SI 0.57 0.67 0.87 −0.15 0.44 −0.58 0.39 0.45 −0.84 1.00
CL 0.22 −0.44 −0.24 0.77 0.29 −0.05 0.16 −0.17 −0.15 −0.20 1.00

Correlations values in bold are significant at P < 0.05. OM: organic matter, TN: organic nitrogen, TP: total phosphorus, K: potassium, Mg: magnesium, CA: calcium, pH: acidity, NA: sodium, SA: sand, SI: silt, CL: clay.

Two groups of sediment variables were found, one related to the dynamics of phosphorus and nitrogen, and the other to changes in sediment composition with OM, K, Ca and pH through cluster analysis (Fig. 1a). The principal components analysis showed that four processes occur in the sediment, such as the SA-SI, TN-OM, pH, and TP relationships (Fig. 1b).

Figure 1 Sediment variables of monoculture (shrimp) and co-culture (tilapia/shrimp) of all treatments, during the two production cycles in the year. a) Dendrogram from hierarchical agglomerative cluster analysis, b) principal components analysis. 

The cluster analysis of the sampling stations showed that there is a significant difference (P < 0.05) between the shrimp monoculture ponds and those of tilapia-shrimp co-culture when forming the two groups (Fig. 2).

Figure 2 Sediment sampling stations of monoculture (shrimp Penaeus vannamei) and co-culture (tilapia Oreochromis niloticus-shrimp) of all treatments, during the rain and dry season. Dendrogram from hierarchical agglomerative cluster analysis. 

DISCUSSION

The main nutrients (TN, TP and K), minor nutrients (Ca, Mg and Na) and the texture (SA, SI and CL) of the sediment at the bottom of white shrimp Penaeusvannamei monoculture and tilapia Oreochromis niloticus-shrimp co-culture were considered to deter-mine the effect of tilapia on the sediment of the shrimp ponds, because its trapping in the sediment of the ponds decreases the total productivity of the pond (Gul et al., 2015). Concerning the sediment texture of the ponds (higher proportion of silt and clay), the analysis showed that the ponds are more than 10 years old and are of the clay-loam type (Siddique et al., 2012). A high percen-tage of clay was found in the wet season due to the contribution of terrigenous material that drains the channel that supplies the water to the ponds. It showed a tendency in the dry season to increase the percentage of clay in co-culture due possibly to the effect of bioturbation caused by tilapia (Adámek & Maršálek, 2013), although it is not significant. The pH registered in the ponds is close to that which is adequate for a good sediment production and in values that correspond to ponds with more than 10 years of operation (Siddique et al., 2012; Gul et al., 2015).

It was found that the concentration of major and minor nutrients in the sediment of shrimp ponds increased during the production cycle, a process reported by Ritvo et al. (1998). The concentration of OM found in the sediment of all the ponds was within what was reported for shrimp ponds in brackish water areas (Smith, 1996). A more considerable amount of organic matter was present in the sediment of the co-culture due to the greater contribution of food and higher density of individuals concerning monoculture because the accumulation of sediments is mainly formed by exogenous contributions, eroded soil, uneaten food, feces, dead plankton and microorganisms (Hopkins et al., 1994). A high amount of TP was absorbed by the sediment of the monoculture ponds at the two seasons of the year, with more in the wet.

In general, the variations of nitrogen and phosphorus in the sediment of shrimp ponds were similar to those reported by Martin et al. (1998) and Perez-Osuna et al. (1999) in these culture systems with the same species. The more significant differences found between the concentrations of TN and TP in the sediment of the ponds in comparison with the other nutrients studied is due to the effect of the tilapia in the co-culture on the sediment mediate the bioturbation process as it has been described by Adámek & Marsálek (2013). The present investigation corroborates that the effect of the tilapia, by the process of bioturbation of the sediment, affects the concentration of nitrogen and phosphorus. It increases the concentration of oxygen in the sediment (Brönmark & Hansson, 2005), improving the process of mineralization (Hansen et al., 1998) of the culture pond contributing to better growth of the shrimp, as has been demonstrated in this work.

Potassium under culture conditions was supplied in ponds by fertilizer, balanced feed, tilapia, shrimp, water inflow and precipitation (Boyd et al., 2007). In the co-culture, a higher concentration of K was recorded in the sediment compared to the initial, and there was a higher absorption in the co-culture sediment. However, harvesting and scraping after the production cycle decline significantly because it was removed through the discharged water, organisms and sediment removed from the pond (Boyd et al., 2007). Mg, Ca and Na were related to the enrichment of the clays fraction because the smaller particles, particularly silts and clays, tend to adsorb and transport large amounts of nutrients due to their relatively larger specific surfaces. Also, it had a non-significant tendency to greater absorption of the co-culture sediment (Boyd et al., 1994).

In conclusion, in this experiment, tilapia was a factor that affected sediment quality, differences in growth between shrimp monoculture and tilapia-shrimp co-culture can be explained, at least in part, by differences in their sediment.

ACKNOWLEDGMENTS

Juárez-Rosales thanks the Mexican National Council for Science and Technology (CONACYT) for the doctoral scholarship 626505 received during this research.

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Received: May 15, 2019; Accepted: June 03, 2019

Corresponding author: Alma D. Román-Gutiérrez (aroman@uaeh.edu.mx)

Corresponding editor: Jesús Ponce-Palafox

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