Abstract
This study evaluated the red alga Gracilaria lemaneiformis and brown alga Sargassum horneri as ingredients to partially replace fishmeal in diets for white spotted snapper Lutjanus stellatus Akazaki (initial mass 12.0 ± 0.1 g). Nine test diets containing 0 (control), 5, 10, 15, and 20% G. lemaneiformis or S. horneri were prepared; each diet was assigned to triplicate groups of fish in a total of 27 floating sea cages (each cage contained 30 fish). After a 60-day feeding trail, significantly lower final body weight, weight gain, and specific growth ratio were found in fish fed 20% G. lemaneiformis diet (P < 0.05), whereas the poorest fish growth performance was obtained with the 20% S. horneri diet. Lipid content in muscle of fish fed 20% G. lemaneiformis diet was significantly lower than that of other groups (P < 0.05); however, body protein was higher than that in other groups. The lowest lipid and moisture contents in muscle were recorded in fish fed 5 and 15% S. horneri diets, and protein content in whole body of fish fed 20% S. horneri diet was significantly lower than that of control and 5% diets (P < 0.05). Activities of pepsin in the stomach and lipase and amylase in the intestine were significantly suppressed in fish fed 20% G. lemaneiformis diet compared with that of control (P < 0.05). The lowest pepsin activity in stomach and lipase activity in intestine were observed in fish fed 20% S. horneri diet. Based on a quadratic regression model of weight gain, the results suggested that the maximum incorporation of G. lemaneiformis and S. horneri in diets should be 16.44 and 15%, respectively, for juvenile white spotted snapper.
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Introduction
Fishmeal (FM) is known to be the best protein source in aquafeeds due to its high content of essential amino acids, fatty acids, high digestibility, and low levels of antinutritional factors. The increasing demand for FM accompanied by shortage in global supply has resulted in escalating FM prices during the past few years (Tacon et al. 2012). Therefore, intensive efforts have been made to maximize the use of available and less costly feed-grade ingredient protein sources to replace FM for aquaculture feed production (Hardy 2010; Borquez et al. 2011; Tacon et al. 2011).
Marine macro-algae are rich in proteins, dietary fibers, minerals, vitamins, antioxidants, phytochemicals, and polyunsaturated fatty acids, but are low in caloric value (Mohamed et al. 2012). Macro-algae have been harvested for many centuries for their nutritional and mineral content as part of human and animal food or for the functional properties of their polysaccharides (Fleurence 1999). Nakagawa et al. (1984) reported that physiological conditions of black sea bream Acanthopagrus schlegelii were effectively improved by 10% Ulva pertusa supplementary in diets. Several studies have evaluated the incorporation of various seaweed species in aquafeeds, such as Monostroma nitidum (Amano and Noda 1985), Undaria pinnatifida, and Ascophyllum nodosum (Yone et al. 1986); Porphyra (Davies et al. 1997); Ulva (Nakagawa et al. 1987; Wassef et al. 2001; Zhu et al. 2016); Sargassum spp. (Casas-Valdez et al. 2006); Gracilaria bursa-pastoris, G. cornea, and Ulva rigida (Valente et al. 2006); Palmaria palmata (Wan et al. 2016); and Gracilaria and Alaria (Peixoto et al. 2017). Most of these studies reported promising results for the use of seaweed as partial replacement of fishmeal or protein hydrolisate in aquafeeds.
Gracilaria lemaneiformis is a common alga in tropical and subtropical waters. In the twentieth century, the increasing food demand has led to a rapid growth of the seaweed cultivation and industry in China (Fei et al. 1999). Large-scale cultivation of G. lemaneiformis has been encouraged in Chinese coastal waters in order to meet the demand of the agar industry and the feed of abalone culture industry (Fei et al. 1999). The contents of protein, carbohydrate, and crude fiber of dry weight (DW) of G. lemaneiformis cultivated in Shenao Bay, Nanao Island, are 19.1, 43.76, and 4.8%, respectively (Yu et al. 2006).
Sargassum horneri is an annual brown alga with a wide distribution ranging from the coast of Japan to the East and South China Sea, and crossing from mid-littoral to sublittoral zones (Hu et al. 2011). Sargassum horneri is rich in protein (22.38%, DW), carbohydrate (20%, DW) (Hossain et al. 2003), and lipid (0.47–1.43%, DW) (Nomura et al. 2013).
White spotted snapper, Lutjanus stellatus Akazaki, is a marine carnivore widely cultured in temperate West Pacific ranging from southern Japan to Taiwan and to the vicinity of Hong Kong because of its high economic value (Akazaki 1983; Shao et al. 2008). The inclusion of Ulva lactuca in diet for white-spotted snapper has been reported (Zhu et al. 2016); however, the inclusion of G. lemaneiformis and S. horneri in diet has not been studied.
The primary objective of this study was to evaluate the effects of using G. lemaneiformis and S. horneri as feed ingredients to partially replace fishmeal in diets for juvenile white spotted snapper. In the present study, growth performance, body composition, and activities of enzymes of the fish fed diets containing various levels of G. lemaneiformis and S. horneri were assessed.
Materials and methods
Experimental diets
Fresh G. lemaneiformis and S. horneri were obtained from Shenao Bay, Nanao Island, Marine Biology Station of Shantou University, Guangdong province, China. After being washed in seawater, the algae were sun-dried and further dried for 5 h at 60 °C, and then finely ground into powder using a laboratory mill. Other dietary ingredients were purchased from Yuequn feed company, Jieyang, Guangdong province, China. Proximate composition of major dietary ingredients is shown in Table 1.
The experimental diets with isonitrogenous (42% crude protein) and isolipid (8.7% crude lipid) were formulated (Table 2). A total of nine experimental diets, G1–G4 and S1–S4 diets containing 5, 10, 15, and 20% of G. lemaneiformis and S. horneri, respectively, and the control diet (Con) with no algae, were formulated.
Dry ingredients were finely ground into powder, passed through a 120-mesh sieve and then thoroughly mixed with soybean oil and water to produce stiff dough. Pellets were puffed by a laboratory feed pelletizer equipped with a 2-mm die (SLP-45; Fishery Mechanical Facility Research Institute, Shanghai, China) at 105 ± 5 °C. After being dried for about 12 h in a ventilated oven at 45 °C, pellets were packed in sealed plastic bags and stored at −20 °C until used. About 20 g of diet in triplicates was sampled for the analysis of biochemical composition.
Experimental fish and feeding trial
Fish used for the experiment were purchased from a local breeding base of fine Haemulidae, Raoping County, shipped with fresh seawater to the Marine Biology Station of Shantou University, then reared in a floating sea cage (2.0 × 2.0 × 2.0 m, L/W/H), and fed a commercial diet (Haiyi feed company, Zhuhai, Guangdong, China) for 2 weeks to adapt to the experimental culture conditions. Fish were starved for 24 h before being anesthetized with 40 mg L−1 eugenol and weighed individually (Iversen et al. 2003). Fish with similar size (mean 12.0 ± 0.1 g) were selected and randomly distributed into 27 sea cages (1 × 1 × 1.5 m, L/W/H), each cage with 30 fish in three triplicates per treatment.
Sea cages were anchored about 3.5 m underwater and 100 m away from the coast in a bay. Fish were held under natural photoperiod conditions throughout the feeding trial station, and hand-fed twice daily (8:00 a.m. and 17:00 p.m.) with diets of 4–6% body weight which was obtained biweekly for 60 days. During the experimental period, temperature ranged from 25 to 33 °C, salinity ranged from 27 to 33 ‰, and dissolved oxygen content was approximately 6.8 mg L−1.
Sample collection
At the termination of the experiment, fish were fasted for 24 h prior to sampling. Total number and mean body weight of fish in each cage were measured. Ten fish from each cage were randomly sampled and immediately euthanized with 40 mg L−1 eugenol (Iversen et al. 2003), and weighted individually. Five fish were used for biochemical analysis. The remaining fish were dissected for organ and tissue sampling. The dorsal muscles, stomach, and intestine were prepared and weighed separately. All samples were stored at −80 °C immediately before further analysis.
Evaluation of growth performance
Growth performance was evaluated by comparing weight gain (WG), specific growth rate (SGR), and feed conversion ratio (FCR) calculated as follows:
where W 2 is the final body weight (g) of fish, W 1 is the initial body weight (g), and t is the number of days for the feeding trial (Hardy and Barrows 2002).
Biochemical analysis
Protein, crude lipid, ash content, and dry matter of diets and fish samples were analyzed according to the methods described by the Association of Official Analytical Chemists (AOAC 2002). Protein contents were determined by using the Kjeldahl Autosampler System 1035 Analyzer (Foss, Sweden), and percent crude protein was then calculated as % N × 6.25. Crude lipid content was determined by Soxhlet extraction. Ash content was analyzed through combustion of samples in a muffle furnace at 550 °C for 6 h. Dry matter was determined by exposing diet samples in a drying oven at 105 °C for 4 h.
Measurement of enzyme activities
Fish stomach and intestine were separately homogenized in four volumes (w/v) of chilled Tris-HCl buffer solution (50 mM, pH 7.6) and then centrifuged (3000 rpm) at 4 °C for 5 min (Centrifuge 5417R, Eppendorf, Germany). After centrifugation, the floating top lipid layer was removed and the supernatant was divided into aliquots in 1.5-mL tubes. The samples were stored at −80 °C until analysis.
Total soluble protein of the homogenate was measured by using Folin phenol reagent. Activities of pepsin, trypsin, lipase, and amylase were determined by spectrophotometry using commercial kits purchased from Nanjing Jiancheng Bioengineering Institute (Jiangsu province, China) following the manufacturer’s instructions. The units of the digestive enzymes activities were defined based on the method reported by Pan and Wang (1997) and the manual of detection kit. Briefly, 1 U of pepsin activity was calculated as 1 μg of tyrosine released per minute at 37 °C. Trypsin activity was expressed as the equivalent enzyme activity that was required to generate an optical density (OD) change of 0.003 at pH 8.0 and 37 °C. Amylase activity was calculated as the activity required to hydrolyze 10 mg of starch in 30 min at 37 °C. One unit of lipase activity was defined as the micromole of substrate hydrolyzed per minute at 37 °C. Enzyme activities were expressed as specific activity (U mg−1 protein).
Statistical analysis
Data were analyzed by using one-way ANOVA and are presented as mean ± SD. Tukey’s multiple comparison tests were used to assess where significant differences occurred. Statistical analyses were performed using SPSS 20.0 (SPSS, USA). A quadratic regression model of average weight gain corresponding to dietary algae replacement level was established in Office Excel 2016 (Microsoft, USA).
Results
Growth performance
Growth parameters of white spotted snapper fed G. lemaneiformis diets are presented in Table 3. The survival was not significantly different among dietary treatments. FBW and WG of fish fed G4 diet were significantly lower than those of the control group (P < 0.05). Fish fed G4 diet showed significantly better FCR compared to those fed G2 diet (P < 0.05); the difference was not significant between fish fed G1, G3, and control diets (P > 0.05). Fish fed G4 diet showed significantly poorer SGR compared to those fed G2 diet (P < 0.05). According to the quadratic regression model of WG of fish fed G. lemaneiformis diets (Fig. 1), the maximal G. lemaneiformis replacement level was 16.44%, which would not reduce the growth performance of fish as compared to the control diet.
Data on growth performance and feed utilization of white spotted snapper fed S. horneri diets are shown in Table 4. The survival was not affected by dietary treatments. Fish fed S1 diet displayed significantly higher SGR compared to S4 diet (P < 0.05), but no significant difference was found between fish fed other diets. Moreover, fish fed S1 diet had the highest SGR, FBW, and WG, but the poorest FCR. The poorest fish growth performance was obtained with the S4 diet. The maximal S. horneri replacement level was 15%, which would not decrease the growth performance of fish as compared to the control diet (Fig. 2).
Body biochemical composition
The lipid and ash contents in muscle were significantly affected by dietary G. lemaneiformis level, and the lipid content in muscle of fish fed G4 diet was significantly lower than that of other groups (P < 0.05, Table 5). The protein content in whole body fed G4 and control diets was significantly higher than that of other groups (P < 0.05), but lipid, moisture, and ash contents in whole body of fish fed G. lemaneiformis diets were not changed significantly among the treatments (P ˃ 0.05, Table 5).
The lipid and moisture contents in muscle, but not protein and ash contents, were significantly affected by dietary S. horneri level (P < 0.05, Table 6). The lowest lipid and moisture contents were recorded in muscle of fish fed S1 and S3 diets. No significant changes in moisture, lipid, and ash contents in whole body were observed among all treatments (P ˃ 0.05), whereas protein content in whole body in fish fed S4 diet was significantly lower than that of control and S1 diets (P < 0.05, Table 6).
Enzyme activities
Effects of G. lemaneiformis on digestive enzyme activities in the stomach and intestine of the fish are shown in Table 7. Pepsin activity in stomach was significantly lower in fish fed G4 diet (44.55 U mg−1 protein), while lipase in stomach was not significantly affected by G. lemaneiformis levels (P ˃ 0.05). Lipase and amylase activities in intestine were significantly lower in fish fed G4 diet (15.74 × 10−3 U mg−1 protein) (P < 0.05), while no effect of G. lemaneiformis was found on trypsin activities in the intestine (P ˃ 0.05).
Pepsin and amylase in the stomach were significantly affected by dietary S. horneri levels (Table 8). The lowest pepsin activity in stomach was observed in fish fed S4 diet (49.41 U mg−1 protein), while lipase in stomach was not significantly affected by S. horneri levels (P ˃ 0.05, Table 8). Pepsin in stomach of fish fed S3 and S4 diets decreased significantly (P < 0.05) as compared to that of fish fed control, S1, and S2 diets. Lipase and amylase in the intestine were significantly affected by dietary S. horneri level. The lowest lipase activity in intestine was observed in fish fed S4 diet (15.5710−3 U mg−1 protein). No effect of S. horneri was found on trypsin in the intestine.
Discussion
Seaweeds are receiving increasing attention as potential nutritional benefits (Rupérez and Saura-Calixto 2001) and as possible ingredients in fish diets (Wahbeh 1997). Studies suggested that omnivorous red sea bream Pagrus major (Mustafa et al. 1994, 1995; Nakagawa et al. 1997) may have potential ability to digest algae. Tacon et al. (1990) suggested that the maximum suitable algae supplement levels in diets may adapt to the feeding habits of fish and species of algae. In this experiment, all diets were readily accepted by fish, indicating that G. lemaneiformis and S. horneri could be used as possible ingredients in fish diets.
Previous reviews detailed that the supplementation of macro-algae meals enhanced growth and feed utilization (Mustafa and Nakagawa 1995; Mustafa et al. 1995). Diler et al. (2007) reported that the best and poorest growth performance of common carp Cyprinus carpio were fed 5 and 20% U. rigida diets, respectively. The supplementation of U. rigida, in the range from 5 to 15% in the diet, improved not only the growth performance but also the quality of carp as a protein product. Therefore, the author suggested that the dietary U. rigida meal inclusion of 5 to 15% replacing wheat meal in carp diets could be acceptable. Xuan et al. (2013) reported that the WG and FER of the fish that received 20% G. lemaneiformis diet were significantly lower than those of the control group, and suggested that G. lemaneiformis in the diet at up to 15% level for black sea bream was feasible according to the growth performance and the physiological state. Shapawi et al. (2015) reported that supplementation of 6% cooked red seaweed Kappaphycus alvarezii achieved significantly higher WG and SGR in Asian seabass Lates calcarifer than other treatments. However, the survival (%) of experimental fish was significantly lower than that of other treatments when the dietary seaweed inclusion was at 22%. In this experiment, the results indicated that the FBW, WG, and SGR of fish fed with G. lemaneiformis and S. horneri did not decrease even at the inclusion level of 15% in diets. According to the quadratic regression models of WG in fish fed G. lemaneiformis and S. horneri diets, the maximal replacement levels were 16.44 and 15%, respectively.
Horie et al. (1995) reported that seaweeds rich in non-starch polysaccharides (NSPs) (e.g., xylans, agar, carrageenan, or alginates) are a type of antinutritional factors (ANFs) limiting the digestibility of nutrients of diets. Brinker (2009) reported that the soluble NSPs in diet form functional networks which reduce lipid, protein, and other nutrient digestibility and therefore decrease growth performance. In this experiment, G. lemaneiformis and S. horneri contained 60.6 and 62.4% nitrogen-free extract, respectively, and the results show that G. lemaneiformis or S. horneri inclusion level reached 20%; the poorest growth performance of the fish was observed. The most likely reason for the detrimental seaweed effects may be that algal soluble NSPs are generally viscous in nature, leading to increased viscosity of diet and the intestinal digesta. This stress will decrease protein and lipid digestibility and consequently growth performance. Meanwhile, the negative effects may be caused by the lower methionine in the seaweeds, which could limit the supplement of seaweeds in diets (Fleurence 2004).
Nakagawa et al. (1984) reported that 10% U. pertusa meal supplement to diet increased muscle lipid level in black sea bream. Norambuena et al. (2015) reported that the diets with 2.5 and 5% Entomoneis spp. and Ulva ohnoi inclusion, respectively, showed a partial (not statistically significant) reduction in total lipid content in whole body, but the diets with 2.5 and 5% U. ohnoi inclusion showed a partial increase (no significance) in lipid content in fillets of Atlantic Salmon (Salmo salar). The results showed significantly higher n-3/n-6 ratio in fillets of fish compared to other treatments due to the variation in n-6 and n-3 fatty acid in 5% Entomoneis spp. and 2.5% Entomoneis spp. + 2.5% U. ohnoi diets. Also, the results showed that the elongation of C18:3n-3 to C20:3n-3 was upregulated in fish fed 2.5% Entomoneis spp. + 2.5% U. ohnoi diets compared to the other treatments. In the present experiments, lipid and ash contents in muscle and protein content in body were significantly affected by dietary G. lemaneiformis levels, and the lipid in muscle and protein in body were significantly affected by dietary S. horneri levels. The results were in agreement with the observations that addition of a small amount of algae in diets influences lipid synthesis and lipid mobilization in the body of fish (Nakagawa et al. 1997). On the other hand, increased lipid deposition with increasing seaweed inclusion levels could be due to a dietary essential amino acid imbalance. Such an imbalance may reduce utilization of protein for growth. This often occurs when fish meal is substituted by plant protein sources (Fournier et al. 2004; Goda et al. 2007).
Previous studies have shown that algal supplementation had effects on digestive enzyme activities both in vitro and in vivo (Indegaard and Minsaas 1991; Nandeesha et al. 1998; Xuan et al. 2013; Zhu et al. 2016). Horie et al. (1995) reported that the soluble dietary fiber fraction (SDF) or insoluble dietary fiber fraction (IDF) from brown seaweeds Saccharina (Laminaria) japonica, U. pinnatifida, and Sargassum fusiforme could inhibit pepsin activity in vitro, and the inhibition was significantly greater with SDFs than IDFs, and the greatest inhibition was observed with SDF of S. japonica. The results showed that the higher the concentration of SDF in the enzyme system, the greater its viscosity and pepsin activity inhibition. Consequently, the authors suggested that the inhibition of pepsin activity in vitro by SDF might be attributed to their viscous property. Nandeesha et al. (1998) reported that a reduction in intestinal protease and lipase activity of common carp was observed at higher levels of Spirulina platensis supplementation, and the hepatopancreatic protease activity of fish fed Spirulina was poorer compared to the control, while the amylase activity was better, and the intestinal amylase and hepatopancreatic lipase activity remained unaffected. In the present results, a significantly lower pepsin activity in the stomach was observed in fish fed 20% G. lemaneiformis or 20% S. horneri diets, and a significantly lower lipase activity in the intestine was observed in fish fed 20% S. horneri diet. The poorer lipase and pepsin activity observed in higher-level G. lemaneiformis and S. horneri diets may be a result of a combined effect of increasing NSPs, soluble or insoluble fibers of seaweeds, and the reduced digestive enzyme activities.
In conclusion, based on quadratic regression, it can be concluded that the maximal incorporation of red algae G. lemaneiformis and brown algae S. horneri in diets are 16.44 and 15%, respectively, for juvenile white spotted snapper. This study provides important information regarding the potential application of G. lemaneiformis and S. horneri as valuable alternative ingredient sources partially replacing fish meal for fish culture.
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Acknowledgements
This study was supported by grant No. S2011030005257 from the Team Project of the Natural Science Foundation of Guangdong Province and grant No. GPKLMB201502 from the Guangdong Provincial Key Laboratory of Marine Biology Open Fund. The authors thank Prof. Chiju Wei, of the College of Science, Shantou University, China, for reviewing the manuscript and his helpful suggestions.
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Zhu, D., Wen, X., Li, S. et al. Evaluation of the red alga Gracilaria lemaneiformis and brown alga Sargassum horneri as ingredients in diets for white spotted snapper Lutjanus stellatus Akazaki juveniles. J Appl Phycol 29, 3211–3219 (2017). https://doi.org/10.1007/s10811-017-1187-2
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DOI: https://doi.org/10.1007/s10811-017-1187-2