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versión On-line ISSN 0718-560X
Lat. Am. J. Aquat. Res. vol.39 no.2 Valparaíso jul. 2011
Lat. Am. J. Aquat. Res., 39(2): 214-224, 2011
Influence of dietary starch and cellulose levels on the metabolic profile and apparent digestibility in penaeoid shrimp
Influencia del nivel de almidón y celulosa en la dieta sobre el perfil metabólico y digestibilidad aparente en camarones penaeoideos
Susana María Velurtas3, Ana Cristina Díaz2,3, Analía Verónica Fernández-Gimenez1,3 & Jorge Lino Fenucci1,3
1Consejo Nacional de Investigaciones Científicas y Técnicas
2Comisión de Investigaciones Científicas
3Departamento de Ciencias Marinas, Facultad de Ciencias Exactas y Naturales Universidad Nacional de Mar del Plata, Funes 3350, B7602AYL, Mar del Plata, Argentina
ABSTRACT. The present study compared the effect of different starch/cellulose ratios (30/0, 20/10, 10/20, 0/30) on the metabolic response and apparent digestibility in two species of penaeoids: Artemesia longinaris and Pleoticus muelleri. Adult animals were used in order to obtain sufficient quantities of haemolymph and faecal material for analysis. No significant differences were found in levels of plasma metabolites in P. muelleri, but in A. longinaris, a significant increase was observed in glucose, total protein, and cholesterol in correlation with increased dietary starch. The apparent digestibility coefficients decreased from 83.7% to 51.2% (A. longinaris) and from 71.9% to 7.6% (P. muelleri) as the dietary starch levels increased. The ratio of amylase activity to protease activity (A/P ratio) declined in A. longinaris when the percentage of dietary starch increased. In contrast, the A/P ratio for P. muelleri increased with higher starch concentrations. These results demonstrated a close relationship between the feeding habits and digestive physiology of the two species studied; they also suggest a more herbivorous behavior for A. longinaris and more omnivorous habits for P. muelleri.
Keywords: Artemesia longinaris, Pleoticus muelleri, apparent digestibility, carbohydrate metabolism, cellulose, starch, haemolymph, Argentina.
RESUMEN. En el presente estudio se comparó el efecto de diferentes concentraciones de almidón/celulosa (30/0; 20/10; 10/20; 0/30) sobre la respuesta metabólica y la digestibilidad aparente en dos especies de peneidos, Artemesia longinaris y Pleoticus muelleri. Se utilizaron animales adultos a fin de obtener cantidades suficientes de hemolinfa y heces para los análisis. No hubo diferencias significativas en los niveles de metabolitos plasmáticos en P. muelleri, en cambio en A. longinaris se observó un incremento significativo de la glucosa, proteínas totales y colesterol en relación con el aumento del almidón en la dieta. Los coeficientes de digestibilidad aparente disminuyeron de 83,7% a 51,2% (A. longinaris) y de 71,9% a 7,6% (P. muelleri) a medida que los porcentajes de almidón en la dieta aumentaron. El cociente entre la actividad de amilasa y proteasa (A/P) se redujo en A. longinaris con los mayores porcentajes de almidón dietario; por el contrario, el cociente A/P en P. muelleri aumentó cuando la concentración fue más alta. Estos resultados demostraron que existe una estrecha relación entre los hábitos alimentarios y la fisiología digestiva de las dos especies estudiadas; sugiriendo un comportamiento más herbívoro para A. longinaris y más omnívoro para P. muelleri.
Palabras clave: Artemesia longinaris, Pleoticus muelleri, digestibilidad aparente, metabolismo de carbohidratos, celulosa, almidón, hemolinfa, Argentina.
The major achievements in crustacean nutrition include the identification of a protein sparing effect of dietary carbohydrates and lipids, leading to considerably lower protein requirements than those originally suggested. The proteins are the higher reserve substrate in shrimp, which can be converted to carbohydrates following the gluconeogenic pathway (Campbell, 1991). The carbohydrates are not essential for crustaceans; shrimp appear to be able to utilize complex carbohydrates better than simple ones such as glucose, which is quickly absorbed and released into the haemolymph, resulting in a physiologically abnormal elevation of plasma glucose levels (New, 1976, 1990; Shiau & Peng, 1992). Starch is nowadays the typical carbohydrate in formulated feeds for crustaceans; it is well hydrolyzed by shrimp such as Fenneropenaeus indicus and Litopenaeus vannamei but poorly hydrolyzed by lobsters (Verri et al., 2001).
The rate of nutrient absorption depends on the rate at which nutrients come into contact with the absorptive epithelium. Dietary fibers, such as cellulose, are associated with the delay in stomach emptying and contribute to the efficient utilization of dietary protein (Gomez Díaz & Nakagawa, 1990). Determination of digestibility can be used to select ingredients that optimize the nutritional value and reduce costs of formulated feeds. Among the methods employed in feed digestibility studies in crustaceans, the use of chromic oxide as an inert indicator is recommended with procedural steps to insure accuracy (Fenucci et al., 1980, 2009; Lee & Lawrence, 1997; Divakaran et al., 2002).
The carbohydrates are incorporated in aquaculture feeds to reduce costs and for their binding properties during feed manufacturing. Waste management has become a prime concern for shrimp farming in many countries. It is generally accepted that a better understanding of feed utilization by the shrimp is essential to reduce environmental pollution through both ammonia excretion and feces egestion; carbohydrate utilization can be achieved and consequently lead to a decrease in the amount of nitrogen waste.
Haemolymph is the prime component involved in the defense mechanism of crustaceans; several metabolic variables of haemolymph, such as proteins, glucose, and cholesterol have been proposed to monitor the effect of environmental conditions on wild and cultured shrimp (Hall & Van Ham, 1998; Sánchez et al., 2001; Pascual et al., 2003). Fluctuations in biochemical variables are also associated with the physiological response to stress, but these variables levels can only be properly interpreted if the nutritional state of the shrimp is carefully controlled.
The present study was designed to compare the dietary effect of different ratio starch/cellulose on selected physiological, metabolic, and hematological responses and the apparent digestibility in two species of penaoids (Artemesia longinaris and Pleoticus muelleri). Both species present seasonal and yearly fluctuations in catches; it is therefore important to establish the feasibility of culturing them on commercial basis to keep a continue supply of these species to the market. The Aquaculture group from the University of Mar del Plata has been working with both species, but mainly with P. muelleri, on different aspects of the biology, nutrition, maturation, massive larval culture, and growth out in ponds. Some studies have demonstrated good survival and growth under culture conditions (Fenucci et al., 1983, 1990; Petriella et al., 1984; Díaz et al., 1996), and determined the nutritional requirements (Fernández-Gimenez & Fenucci, 2002; Romanos-Mangialardo & Fenucci, 2002) as well as gonadal maturation in captivity (Díaz et al., 1997, 2001; Díaz & Fenucci, 2004), and characterized the digestive proteinases in relation to the molting cycle (Fernández-Gimenez et al., 2002).
MATERIALS AND METHODS
Feed and feeding trials
Artemesia longinaris and Pleoticus muelleri were obtained from a commercial fisherman in the coastal waters of Mar del Plata, Argentina (38°S). Large adult animals were used in these experiments to obtain sufficient quantities of faecal material for the analysis of feed digestibility. All individuals were kept in 150 L glass aquaria with continuous aeration during four weeks. Filtered seawater (to 5 µm) was exchanged at a rate of 50% per day. Shrimp were exposed to constant conditions of photoperiod (11 h light-13 h dark), temperature (18°C), pH 7, and salinity (31 ppt). The ammonium concentration never exceeded 0.2 mg L-1. All groups were fed ad libitum once a day (09:30 h). Formulated feeds were tested in triplicate groups for both species, each A. longinaris group consisted of 6 shrimp (2.7 ± 0.9 g mean weight) and P. muelleri groups had 4 shrimp (9.7 ± 2.0 g mean weight), randomly chosen.
The treatments consisted of four dry formulated feed prepared to contain different ratios starch/cellulose (30/0; 20/10; 10/20; 0/30), with 0.5% chromic oxide as an inert indicator (to calculate the apparent protein digestibility coefficients). Formulations were made according to the chemical composition results of the by-products meal in order to obtain isoproteic and isolipidic diets. The chemical composition of the formulated feeds was confirmed through proximate analysis (Table 1) according to AOAC (1997). All ingredients, from a local feed manufacturer, were mixed and cold pelleted (< 50°C) by extrusion (Fenucci & Zein-Eldin, 1976) and were oven-dried for 24 h at 50°C.
After a 7-day period of adjustment to the new conditions and diets was beginning of fecal collection. To determine the apparent digestibility for crude protein, before each feeding, feces were collected during two weeks by siphoning and rinsed with distilled water to eliminate the excess of salts. The fecal material from each tank was pooled and frozen at -20°C for analysis.
Proximate analyses of faecal samples were carried out using AOAC methods (1997). The chromic oxide levels were measured with a spectrophotometer (540 nm) (Shimadzu UV-2102 PC, UV-visible Scanning Spectrophotometer). The apparent digestibility coefficient (ADC) was estimated according to Fenucci et al. (1980): ADC (% protein digestibility) = 100 -(Ia/Ib . IIb/IIa . 100) where: Ia =%Cr2O3 feed; Ib = % Cr2O3 feces; IIa = % protein food; IIb = % protein feces.
Sampling and analyses of metabolic variables
At the end of the experiments (four weeks), shrimp were anaesthetized in ice water for approximately 5 min, then the haemolymph was extracted and midgut gland was removed. All shrimp used in the analysis were in the intermolt stage (Petriella, 1984; Díaz & Petriella, 1990). Samples collected from eight individuals (n = 8) of each treatment group were analyzed separately.
Approximately 200-300 µL of haemolymph were extracted from the arthrodial membrane of the fifth pereiopod of each organism; using a 1 mL syringe rinsed with a 10% cooled anticoagulant solution of sodium citrate. The haemolymph was centrifuged at 800 g for 5 min, and plasma transferred into a new tube and stored at -20°C for further analysis.
Midgut glands were carefully dissected and immediately frozen at -20°C and homogenized in chilled distilled water and centrifuged for 30 min (10,000 g at 4°C), the upper aqueous phase was stored at -20°C.
Glucose, total protein and cholesterol concentrations in plasma and supernatants from homogenate were measured using commercial kits for medical diagnosis (Wiener Laboratories SAIC, Argentina), according to the manufacturer's protocols and quantified in a Metrolab 1600DR (Wienerlab Instrument). The extracts were analyzed in triplicate.
The amount of soluble protein in the homogenized midgut glands used for enzyme analysis was determined by the Bradford method (1976). Albumin from chicken egg white (Sigma) was used as the standard.
Total proteinase determination was performed with 1% azocasein in 50 mM Tris-HCl, pH 7.5 as substrate. Triplicates of 5 µL of enzyme extracts were mixed with 0.5 mL of buffer and 0.5 mL of substrate solution. The reaction mixtures were incubated for 10 min at 25°C. Proteolysis was stopped by adding 0.5 ml of 20% trichloroacetic acid TCA, and the mixture was centrifuged in Eppendorf tubes for 5 min at 14 000 g. The supernatants were separated from the undigested substrate and the absorbance at 366 nm was recorded for the released dye (García-Carreño, 1992).
Total a-amylase activity was determined using commercial kits for medical diagnosis (Wiener Laboratories SAIC, Argentina), according to the manufacturer's protocols and quantified in a Metrolab 1600DR (Wienerlab Instrument).
Total cellulase activity was determined according to Martínez et al. (1999) modified method. A solution of crystalline cellulose was prepared in substrate buffer sodium acetate 0.05 M; pH 5. A 24 mL volume of this substrate solution was then mixed with 1 mL of midgut gland extract, incubated with gentle agitation, for 2 h at 30°C. The reaction mixture was centrifuged, 2 ml of supernatant was separated and added 0.1 mL starch solution (100 mg mL-1) and 2 mL of 3.5-dinitrosalicilic acid. Then, the extract was incubated for 5 min at 100°C and the absorbance was recorded at 490 nm. The extracts were analyzed in triplicate.
One-way ANOVA and Duncan's multiple comparisons of means were preformed to compare the data obtained. Homogeneity of variances was verified with Cochran's test. An arcsine transformation was applied before processing percentages data. Protein digestibility among different treatments was evaluated through regression analyses. A correlation coefficient was used to describe the fit of the data on the regression line. ANCOVA was used to test differences among regression lines. To find out the relationships among different ratio starch/cellulose in the diet and metabolic variables, Pearson's rank correlation coefficient was done. A probability level of 0.05 was used to assess significance in all measured parameters. (Sokal & Rohlf, 1995).
Mean values of metabolic variables for each species are shown in Figure 1. There were no significant differences in levels of plasma metabolites in P. muelleri when shrimp were fed with different ratio starch/cellulose. Significant variations were observed in the metabolic variables of A. longinaris, a significant increase in glucose, total protein, and cholesterol was noted in correlation with the increase in starch.
Figure 1. Metabolic variables in haemolymph and midgut gland of A. longinaris and P. muelleri fed with different ratio starch/cellulose in the diet. Error bars indicate standard deviation. Different letters indicate statistical differences (P < 0.05).
Figura 1. Variables metabólicas en hemolinfa y hepatopáncreas de A. longinaris y P. muelleri alimentados con diferentes niveles de almidón/celulosa en la dieta. La barra indica la desviación estándar. Letras distintas indican diferencias estadísticas significativas (P < 0,05).
The analysis of the midgut gland from shrimp fed with different levels of starch/cellulose showed that concentration of metabolites was different in both species. The highest level of cholesterol was observed in A. longinaris fed with D1 (30/0, starch/cellulose), whereas concentrations of glucose and total protein were not significantly different. In contrast, in P. muelleri glucose was significantly higher in shrimp fed with D1 than in those fed with diet containing lower starch levels.
Soluble protein content of the midgut gland was 15.3 ± 1.68 mg mL-1 in A. longinaris and 17.3 ± 2.30 mg mL-1 in P. muelleri. No significant differences were observed in proteinase and a-amylase activity in midgut gland extracts from the four dietary groups in both species (Table 2). No specific cellulase activity was observed in the midgut gland extracts.
The ratio of amylase activity to protease activity (A/P ratio) decreased in A. longinaris when the percentage of dietary starch increased. In contrast, the A/P ratio for P. muelleri increased when starch concentration was high (Fig. 2).
The apparent protein digestibility coefficients decreased from 83.7% to 51.2% in A. longinaris) and from 71.9% to 7.6% in P. muelleri with the increase in dietary cellulose levels, and was significantly different among treatments. In vivo apparent protein digestibility was related to dietary cellulose contents as shown by the regression analysis (y = 0.095x2 -4,2647x + 88,671; R2 = 0.7198 for A. longinaris, and y = 97,476 e-0, 0829x, R2 = 0.724 for P. muelleri) (Fig. 3).
Pearson correlation coefficients showed that all variables exhibited a greater degree of correlation with the cellulose rate, except glucose in haemolymph for A. longinaris (Table 3) and glucose in midgut gland for P. muelleri (Table 4). Metabolic variables were correlated with each other.
Dietary nutritional requirements of two species of penaeoids were investigated on the basis of their haemolymph metabolic contents and the apparent digestibility analysis to determine which the dietary components that were better assimilated are. The penaeoids shrimp do not present a dietary glucose requirement since this compound can come from the gluconeogenesis from the amino acids. Nevertheless, these organisms own a complete enzymatic structure for the digestion of proteins and polysaccharides, such as starch, glycogen, laminarin, and chitin that are natural components of their diet. (Tacon, 1990). The starch is a straight-chain consisting of glucose molecules linked together by a (1-4) bonds, conformed by two units' amylose and amylopectin. The starches rich in amylose are poorly digestible because a-amylase cannot hydrolyze the amylase, in contrast, the starch rich in amylopectin is relatively well digested (Gaxiola et al., 2006). The cellulose is also a polymer of glucose but it differs in its glycoside bonds, which are P (1-4). The inclusion of starch in the shrimp's diet represents the greater source of energy. The incorporation of cellulose was used to compensate the amount of carbohydrates added to the experimental diet or to increase stomach emptying (Shiau, 1997).
The type of food is a dominant factor affecting shrimp haemolymph metabolites (Pascual et al., 2003). Baseline levels of the haemolymph metabolites were obtained by Rosas et al. (2002) in Litopenaeus vannamei to be used as reference parameters. Glucose is the major component of circulating carbohydrates in crustaceans, but its concentration varies markedly among the species (Chang & O'Connor, 1983). Increases in haemolymph glucose are also associated with the physiological response to stress in shrimp, but levels can only be properly interpreted if the nutritional state of the shrimp is carefully controlled (Hall & Van Ham, 1998). Furthermore, the glucose in haemolymph is an indicator of the carbohydrates metabolism and the level of this nutrient in the diet. In the present study, the glucose levels were similar to those reported in juvenile L. setiferus, L. vannamei and L. stylirostris (Rosas et al., 2000). In A. longinaris, the glucose in haemolymph was no correlated with cellulose level in the diet (Table 3); shrimp could activate its compensation mechanism that allowed the recovery of haemolymph metabolites to maintain the homeostasis. This mechanism could involve the use of reserves stored in digestive gland, such as demonstrated in other species (Pascual et al., 2003).
From the entire set of metabolites studied in A. longinaris plasma, glucose, total protein, and cholesterol were the most affected by the increase of starch in diet. But in P. muelleri there were no significant variations under the same conditions.
In P. muelleri, cholesterol in midgut gland showed slight fluctuations, however in A. longinaris, significant differences were observed among dietary treatments (Fig. 1). The shrimp's midgut gland is considered the main storage organ, mainly accumulating lipids, and to a lesser degree, glycogen. It has been proposed in crustaceans, that cholesterol is conserved due to their role as structural component of cell membranes, and is also an essential nutrient for crustaceans since they are incapable of de novo synthesis of the steroid ring (Rabid et al., 1999). The dependence of haemolymph cholesterol on dietary lipids levels is related to the ability of shrimp to store and synthesize lipids. Mourente & Rodríguez (1991) and Teshima (1998) showed that because of the limited space in shrimp's digestive gland, lipids must be processed rapidly and delivered into the haemolymph, where they are transported to the different tissues to be metabolized. With regards to P. muelleri, this species will be using cholesterol of the diet quicker than A. longinaris. Probably for that reason it is observed higher levels of cholesterol in A. longinaris haemolymph and midgut gland and in P. muelleri only in the haemolymph. As all supplied diets had the same cholesterol level, it was evident that P. muelleri presented a greater requirement of this nutrient, which was demonstrated by a smaller level of reserve. P. muelleri would be more carnivorous and require cholesterol from animal sources. This is in agreement with the results of digestibility, which decreased with increasing cellulose inclusion
Borrer & Lawrence (1989) observed that the level of dietary cellulose affected apparent protein digestibility in Farfantepenaeus aztecus, by lowering digestibility values as cellulose levels increased. A similar result was observed in Macrobrachium rosenbergii (González-Peña et al., 2002). On the other hand, in L. vannamei the protein digestibility did not change with the different levels of cellulose (Borrer & Lawrence, 1989; Guo et al., 2006). It was evident that A. longinaris fed with diets poor in cellulose content (D1 and D2) assimilated better the nutrients than P. muelleri and this fact was reflected by an increase of circulating metabolites and the apparent digestibility (Fig. 3). In both species, the digestibility values decreased from D1 to D4, nevertheless the values of apparent digestibility in A. longinaris were higher than in P muelleri. This fact would be related to the rate of nutrient absorption that depends on the time at which nutrients come into contact with the absorptive epithelium. According to other authors, the relative influence of dietary fiber on the movement of nutrients along the gastrointestinal tract affects nutrient absorption (Shiau, 1997). So, it is possible that the dietary fiber with high viscosity reduces the interaction between the enzymes and substrates, reducing absorption rates. The binding capability of the dietary fiber is another possible factor that can reduce the availability of nutrients (González-Peña et al., 2002).
The proteins are essential nutrients for the penaeoids shrimps because they are basic for growth, the regulation of the internal osmotic pressure, the gluconeogenesis and the immune system (Rosas et al., 2002). Therefore variations of this nutrient in haemolymph can be used as good indicator of general physiological state. The increment in haemolymph proteins observed in A. longinaris feed D1 and D2 (high levels starch) could be related with amino acids synthesis from the transamination pathway, and its posterior storing (Rosas et al., 2001). The values of proteins in haemolymph and digestibility for the different treatments in P. muelleri did not adjust to a same pattern. Whereas digestibility was greater in D1 and D2, there were no differences in the circulating proteins. From the analysis of the proteins data it can be postµLated that P. muelleri employs these absorbed proteins for muscular development or growth.
Penaeid shrimp adapt quite well to changes in diet composition by the induction of digestive enzymes synthesized and secreted in midgut gland. These enzymes hydrolyze a variety of substrates and various factors are involved in their regulation, including diet (Gamboa-Delgado et al., 2003). Therefore, the digestive enzyme profile can be used to illustrate the capacity of shrimp to exploit diet in order to meet nutritional requirements. Carnivorous species generally have a wide range of proteolytic enzyme at high concentrations, which is consistent with their ability to hydrolyze high levels of dietary protein (Johnston & Yellowlees, 1998). However, omnivores and herbivores have a wide range and higher concentration of carbohydrases, consistent with their ability to hydrolyze plant and animal dietary carbohydrate (Wigglesworth & Griffith, 1994). The decline in the ratio of amylase to protease observed in A. longinaris in our study, confirms that carbohydrate digestion and its utilization change with the increase in dietary starch levels. In contrast, in P. muelleri the A/P ratio was correlated with dietary starch level. This shift in relative importance of carbohydrate and protein highlights the strategy outlined above, whereby carbohydrate energy reserves are used initially, while protein becomes important once carbohydrate reserves are depleted.
In the current study, there was no cellulase activity in the midgut gland of both species. It is now clear that cellulases are produced endogenously in a number of invertebrate taxa that includes crustaceans; genes for cellulose enzymes (β-glucosidase and endo-β-1,4-glucanase) are present in the genome of crayfish (Cherax sp.) (Linton et al., 2006). However, in penaeoid species cellulose digestion has not been unequivocally demonstrated (Shiau, 1997). More suitable substrates and assays for the determination of cellulase activity are required to clarify matters.
Although the bibliography indicates that both species studied in this work present a similar nourishing regime (Boschi, 1989; Gavio & Boschi, 2004), studies in culture conditions showed that both species have a 92% apparent digestibility of proteins with diets having fish meal as the main ingredient; when this ingredient is replaced by soybean meal, the digestibility is 83% for A. longinaris and 47.7% for P. muelleri (Fenucci et al., 2009). This difference in digestibility can be related to the more carnivorous behavior of the latter species. The present study shows that apparent protein digestibility was influenced by the levels of dietary starch and cellulose in both species; increasing cellulose levels caused significant reduction in protein digestibility. The inclusion of starch as source of carbohydrates in the diet seems to be more suitable than cellulose.
This research was funded by a grant PIP. N°112-200801-02585 from CONICET (Consejo Nacional de Investigaciones Científicas y Técnicas) Argentina. Special thanks to Dra. Liliana Sousa by the revision of the English language of the manuscript. The authors also thanks anonymous reviewers and editor for critically reviewing the manuscript.
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Received: 7 July 2010; Accepted: 19 April 2011
Corresponding author: Ana Cristina Díaz (email@example.com)