ࡱ> 5@ 0FRbjbj22 <\XXu GGG8G|lHw F}[^FEFFECT OF REPLACING SOYBEAN MEAL BY SUNFLOWER MEAL IN THE DIETS FOR NILE TILAPIA, OREOCHROMIS NILOTICUS (L.) MOHAMED YAHIA ABOU ZEAD1, M. A. SOLTAN2 AND M. S.IBRAHIM2 World fish Center, Regional Research Center for Africa and west Asia Abbassa Sharkia Egypt. Fac. Agric. Moshtohor, Zagazig University Benha Egypt Abstract Five experimental diets were formulated where local soybean meal in the basal diet (D1) was replaced by sunflower meal at graded levels 25, 50, 75 or 100% (D2 to D5 respectively) and fed to Nile tilapia fry for 90 days. The highest average body weight (16.76 g) was recorded in group 1 which was fed on basal diet followed in a descending order by those fed the diet D3 (15.25 g), D2 (14.89 g), D4 (14.73 g) and D5 (12.62 g), respectively and the differences between these means were significant indicating the possibility of partial replacement of soybean meal by sunflower meal up to 75% without adverse effect on final body weight of Nile tilapia and similar trend was also observed for body length (BL), weight gain (WG), specific growth rate (SGR). The feed conversion ratio (FCR) at the end of the experimental period ranged from 2.44 for fish fed the basal diet (D1) to 4.05 for fish fed the diet D5 (complete replacement of soybean meal) and the same trend was also observed for protein efficiency ratio (PER) and the differences in FCR and PER for the different treatment were significant (P<0.05). The complete substitution of soybean by sunflower meal showed the highest protein content of whole fish followed in a descending order by those fed the diets D1, D4, D3 and D2, and the differences were significant (P<0.01). Ether extract and ash content were not significantly affected by the increased levels of sunflower meal in tilapia diets. From economic point of view, results of the present study showed that replacing 75% of soybean meal by sunflower meal reduced feeding costs by 15.13%. INTRODUCTION Aquaculture has become the fastest-growing food production sector of the world, with an average annual increase of about 10% since 1984 compared with a 3% increase for livestock meat and a 1.6% increase for capture fisheries (FAO, 1997). To sustain such high rate of increase in aquaculture production; similar increase in the levels of fish feed production is required. The intensive use of soybean meal in poultry and fish feeds led to increasing price of soybean meal with its unavailability. In 2003, Egypt imported one million ton of soybean in forms of seeds or meals (Osman and Sadek, 2004). In this context, research efforts have been directed to identify novel, alternative and economically viable plant protein sources for partially or totally replacing soybean meal in the fish feed. One of the possible alternative plant protein sources is sunflower meal. Since tilapia fish have become a top priority fish for culture in Egypt because of its fast growth, efficient use of natural aquatic foods, propensity to consume a variety of supplemented feeds, resistant to diseases and handling, ease of reproduction in captivity, tolerance to wide range of environmental conditions, Nile tilapia Oreochromis niloticus was therefore chosen to carry out this study. Materials and methods The present study was carried out at the Laboratory of Fish Nutrition Faculty of Agriculture Benha University. The aim of the experiment is to investigate the effect of replacing the soybean meal by sunflower meal to reduce feed costs of Nile tilapia (Oreochromis niloticus). Experimental conditions Ten rectangular aquaria 50 40 50cm (100 liter) were filled by 80 liter freshwater were used to represent five experimental treatments (2 replicates) and each aquarium was stocked with 12 fish with an initial weight ranged from 6.04 to 6.20 g/ fish. Fish source and Management Fish were obtained from Abbassa hatchery, Abbassa village, Abu-Hammad district, Sherkia Governorate, Egypt. Fish were transported in a 50 liter plastic bags filled with freshwater and oxygen to the laboratory, and then stocked in fiberglass tanks for two weeks before start the experiment for acclimization where all fish were fed daily on the control diet at a rate of approximately 3% of their average body weight to be adapted to pelleted feeds. After the acclimatization the experimental fish were distributed randomly into the experimental aquaria representing five treatments. At stocking body weight and body length of fingerlings per aquarium were recorded. The aquaria were cleaned and water was replaced every four days, dissolved oxygen was maintained at 3-6 mg/L by continuous aeration (estimated by using dissolved oxygen meter) and water temperature at 23 to 27C. Diet preparation and feeding practices Five experimental diets were formulated as shown in Table (1). Diets of the experiment were prepared by thoroughly mixing the grinded ingredients which composed of fish meal, local soybean meal, sunflower meal, yellow corn, wheat flour, corn oil and wheat bran with different percentage. Water was added to the ingredients of each diet for mixing these ingredients and then dried. After drying, the diets were broken up and then sieved into the convenient pellet size. Fish were given the diets at a daily rate of 4% of total biomass till the end of experimental period. Fish were fed 6 day/week (twice daily at 9.00 am and 3.00 pm). Every two weeks, total fish of each aquarium were weighed and the amount of feed was readjusted according to the changes in body weight throughout the experimental period (90 days). Table 1. Composition and chemical analysis of the experimental diets Feed ingredientsExperimental dietsDiet1Diet2Diet3Diet4Diet5Fish meal (65%)1616161616Yellow corn2828282828Local soybean meal (40%)403020100Sunflower meal(40%)010203040Wheat bran10.510.510.510.510.5Vegetable oil2.52.52.52.52.5Vit. & Min. mixture13.03.03.03.03.0Sum100100100100100Chemical analysis (determined on dry matter basis)Dry matter (DM)7.446.556.127.156.89Crude protein (CP)30.1830.6630.7130.8030.91Ether extract (EE)4.444.234.874.204.36Crude fiber (CF)9.3310.2210.1010.2410.66Ash10.1210.1410.3310.4510.15NFE245.9344.7543.9944.3143.92ME (Kcal/kg diet)326102609260726002595P/E ratio4115.63117.52117.80118.46119.111 Vitamin & mineral mixture/kg premix : Vitamin D3, 0.8 million IU; A, 4.8 million IU; E, 4 g; K, 0.8 g; B1, 0.4 g; Riboflavin, 1.6 g; B6, 0.6 g, B12, 4 mg; Pantothenic acid, 4 g; Nicotinic acid, 8 g; Folic acid, 0.4 g Biotin,20 mg , Mn, 22 g; Zn, 22 g; Fe, 12 g; Cu, 4 g; I, 0.4 g, Selenium, 0.4 g and Co, 4.8 mg. 2 Nitrogen free extract (NFE) =100-(CP+EE+CF+Ash) 3 Metabolizable energy was calculated from ingredients based on NRC (1993) values for tilapia. 4. Protein to energy ratio as mg protein/Kcal ME. Growth performance and feed utilization parameters Live body weight (g) and body length (cm) of individual fish were measured in each aquarium and registered every 14 day (two weeks) during the experimental period. Growth performance parameters were measured by using the following equations: Condition factor (K) = (W/L3) x 100 Where: W = weight of fish in grams L = total length of fish in cm Specific growth rate (SGR) = EMBED Equation.3100 Where: Ln = the natural log, W1 = first fish weight (g), W2 = the following fish weight (g) and t = period in days. Weight gain = final weight (g) initial weight (g) Feed conversion ratio (FCR) = Feed ingested (g)/Weight gain (g) Protein efficiency ratio (PER) = Weight gain (g)/Protein ingested (g) Chemical analysis of fish and experimental diets At the end of the experiment, three fish were randomly sampled from each aquarium and subjected to the chemical analysis of whole fish body. Dry matter (DM), ether extract (EE), crude protein (CP), crude fiber (CF) and ash content of diets and fish were determined according to the methods described in AOAC (1990). Statistical analysis The obtained data were analyzed according to SAS (1996). The following model was used to analyze the obtained data: Yij = + i + eij Where: Yij = the observation on the ijth fish eaten the ith diet; ( = overall mean, (i= the effect of ith diet and Eij = random error assumed to be independently and randomly distributed (0, 2 e). RESULTS AND DISCUSSION Growth performance No significant differences (P>0.05) were observed between fish groups (6.04 6.2 g/ fish) at the beginning of the experimental period (90 days). The highest average BW (16.76 g), at the end of the experiment was recorded in group 1 which was fed the basal diet. In previous study, Sanz et al., (1994) evaluated the nutritive potential of sunflower meal protein as compared to soybean meal and fish meal protein in trout diets and they found that, sunflower meal protein could replace up to 40% of fish meal protein or soybean meal protein in the diet without any negative effect on fish body weight. In another study, Abdul-Aziz et al., (1999) showed the possibility of partial substitution of soybean protein by sunflower protein up to 50% without adverse effect on body weight of Nile tilapia fingerlings. In recent studies, some attempts were carried out to replace the high cost animal protein source by sunflower meal (low costs plant protein). Fagbenro and Davies (2000) found that, replacement of 67% of fish meal by sunflower meal in tilapia diets did not significantly altered fish final weight. In this respect, Olvera-Novoa et al., (2002) showed the possibility to replace animal protein source in tilapia fry diets with sunflower seed meal up to 20% without significant effect on body weigh of Nile tilapia fry, while the highest replacing levels significantly decreased the body weight. In another study, El-Saidy and Gaber (2002) found that up to 50% dehulled sunflower meal protein could be used to replace fish meal as a protein source in the diet of Nile tilapia, Oreochromis niloticus without significant effect on the fish body weight. Abbas et al., (2005) found that the gradual rise in replacement level of fish meal by sunflower meal negatively affected growth performance of major carps and the minimum decrease in fish production was recorded at 25% replacement level while the maximum decrease was recorded at 75% replacing level of fish meal by sunflower meal. Table 2. Effect of increasing levels of sunflower in the diets on body weight (BW), body length (BL) and condition factor (K) of Nile tilapia. Condition factorBody length (BL)/cmBody weight (BW)/gmNoDietsFinalInitialFinalInitialFinalInitial1.720.01 b1.750.0410.120.2 a7.060.216.760.9 a6.120.524D1 (0% SFM)1.820.01 b1.750.0410.360.2 a7.060.214.890.9 a6.160.524D2 (25% SFM)1.760.01 b1.740.0410.540.2 a7.040.215.250.9 a6.050.524D3 (50% SFM)1.740.01 b1.730.0410.470.2 a7.050.214.730.9 a6.040.524D4 (75% SFM)2.170.01 a1.750.048.350.2 b7.080.212.620.9 b6.200.524D5 (100 SFM)Averages within each column followed by different letters are significantly different (P<0.05) Average BL at the beginning of the experiment among the different treatments ranged between 7.04 and 7.08 cm without insignificant differences between the different experimental treatments (Table 2). At the experiment termination, complete replacement of soybean meal by sunflower meal released the lowest significant (P<0.05) BL value (8.35 cm) while fish fed diet (D3) gained the longest BL value (10.54 cm) and the differences among other groups were not significant (P>0.05). Results of tilapia BL affected by replacing sunflower meal instead of soybean indicated that replacing soybean meal by sunflower meal in tilapia diets up to 75% did not affected the final BL while the complete replacement significantly reduced the BL of tilapia and these results relatively similar to those obtained for BW (Table 2). At the start of the experiment average values of condition factor (K) ranged between 1.73 and 1.75 and the differences among the experimental groups were not significant (P>0.05) while at experimental termination, fish group fed diet D5 showed the highest K value (2.17) and this value is significantly different (P<0.05) from those recorded for the other experimental diets, D1 (1.72), D2 (1.82), D3, (1.76), and D4 (1.74). In the study of Abdul-Aziz et al., (1999) who reported that condition factor did not significantly affect when 25 or 50% of soybean meal was replaced by sunflower meal in tilapia diet. Results in Table (3) showed that, after 90 days of the experimental start, the averages of weight gain (WG) were found to be 10.64, 8.74, 9.20, 8.70 and 6.42 g / fish for the experimental diets D1, D2, D3, D4 and D5, respectively. Table 3. Effect of increasing levels of sunflower in the diets on body weight gain (WG) and specific growth rate (SGR) of Nile tilapia fed experimental diets Specific growth rateWeight gain (g/fish)Diets1.120.05 a10.640.62 aD1 (0% SFM)0.980.05 a8.740.62 abD2 (25% SFM)1.030.05 a9.200.62 aD3 (50% SFM)0.990.05 a8.700.62 abD4 (75% SFM)0.790.05 b6.420.62 bD5 (100 SFM) Averages within each column followed by different letters are significantly different (P<0.05) + Average of two replicates (aquaria) Sanz et al., (1994) found that, sunflower meal protein could replace up to 40% of fish meal protein or soybean meal protein in trout diets without significant effect on weight gain. Also, El-Saidy and Gaber (2002) showed that up to 50% dehulled sunflower meal protein could be used to replace fish meal as a protein source in the diet of Nile tilapia, Oreochromis niloticus without significant effect on weight gain of Nile tilapia. On the other hand, Fagbenro and Davies (2000) found that replacing 67% of fish meal by sunflower meal significantly (P<0.05) decreased WG of Nile tilapia. In the same respect, Furuya et al., (2000) concluded that, increasing sunflower meal in tilapia diets resulted in quadratic effect (P<0.05) on WG of Nile tilapia. Also, Olvera-Novoa et al., (2002) showed that it is possible to replace animal protein source by sunflower seed meal up to 20% without significant effect on WG of Nile tilapia fry while higher replacing levels significantly decreased the final WG of Nile tilapia fry. Average values of SGR found to be 1.12, 0.98, 1.03, 0.99 and 0.79 (Table 3) for the different experimental diets D1, D2, D3, D4 and D5, respectively. The highest value of SGR (1.12) was recorded for fish group fed the basal diet and this may be attributed to the positive effect of balanced amino acid composition of soybean meal compared to sunflower meal. In the study of El-Saidy and Gaber (2002) found that up to 50% dehulled sunflower meal protein could be used to replace fish meal in the diet of Nile tilapia without significant effect on SGR while the highest replacing levels (75 or 100%) significantly decreased SGR. On the other hand, Fagbenro and Davies (2000) found that replacing 67% of fish meal by sunflower meal significantly (P<0.05) reduced SGR of Nile tilapia. In this respect, Sanz, et al., (1994) concluded that, up to 40% of the fish meal in trout diets could be replaced by sunflower meal without significant effect on SGR. Also, Shipton and Britz (2001) found no significant differences in growth rates between control diet (100% fish meal) and diets in which 30% fish meal had been replaced by sunflower meal. In another study, Olvera-Novoa et al., (2002) showed that replacement of fish meal in tilapia fry diets with sunflower seed meal up to 20% did not significantly affected SGR of Nile tilapia fry while the higher replacing levels significantly decreased SGR of Nile tilapia fry. Sunflower meal has been reported to contain a lot of endogenous anti-nutritional factors, such as a protease inhibitor, an arginase inhibitor and the polyphenolic tannin chlorogenic acid (Tacon et al., 1984). It has relatively high crude fiber content, which can reduce the pelleting quality and protein digestibility of the feed included at high levels (Kamarudin et al., 1989). Sunflower meal also contains low levels of lysine. Despite these drawbacks, sunflower meal has been reported to be a good protein source for Nile tilapia, Oreochromis niloticus even at 696 g/kg of the diet (Jackson et al., 1982). Feed utilization Reduced growth response in Nile tilapia fed diets in which soybean meal was completely replaced by sunflower meal have been explained by sub-optimal amino acid balance, inadequate levels of phosphorus, inadequate levels of energy, low feed intake caused by palatability, presence of high content of endogenous anti-nutrients (Lim and Dominy, 1991). Lower growth at the complete replacement of soybean meal by sunflower meal in the present study may be caused by one or some of these factors. The final FCR at the end of the experimental period were ranged from 2.44 for fish fed the basal diet (D1) to 4.05 for fish fed the diet D5 (complete replacement of soybean meal). The present results are in a good agreement with those obtained by Furuya et al., (2000) who concluded that, increasing sunflower meal in tilapia diets resulted a quadratic effect (P<0.05) on feed conversion ratio of Nile tilapia. Abdul-Aziz et al., (1999) found that, replacement of soybean meal by sunflower meal at replacing levels of 25% or 50% significantly adversed FCR of Nile tilapia. Also, Olvera-Novoa et al., (2002) showed that replacement of fish meal source by sunflower seed meal up to 50% in tilapia fry diets improved FCR of Nile tilapia fry. In the study of El-Saidy and Gaber (2002) who found that up to 50% dehulled sunflower meal protein could be used to replace fish meal as a protein source in the diet of Nile tilapia without significant effect on the FCR of Nile tilapia, O. niloticus while the higher replacing levels significantly adversed FCR of Nile tilapia. Fagbenro and Davies (2000) found that, replacement of 67% of fish meal by sunflower meal in tilapia diets did not significantly altered the FCR of Nile tilapia fish. Protein Efficiency Ratio (PER) for fish group fed the basal diet released the highest value and increasing the inclusion levels of sunflower meal in tilapia diets significantly decreased the values of PER (Table 4). In the study of Martinez (1986) sunflower meal replaced completely soybean meal in trout diet and he decided that sunflower meal can replace soybean meal without negative effects. Furuya et al., (2000) concluded that, increasing sunflower meal in tilapia diets resulted a quadratic effect (P<0.05) on PER of Nile tilapia. Table 4. Effect of increasing levels of sunflower in the diets on feed conversion ratio FCR and protein efficiency ratio (PER) of Nile tilapia fed the experimental diets. Protein efficiency ratio (PER)Feed conversion ratio (FCR)Diets1.360.06 a2.440.30 cD1 (0% SFM)1.100.06 b2.970.30 bD2 (25% SFM)1.150.06 b2.830.30 abD3 (50% SFM)1.090.06 b2.990.30 abD4 (75% SFM)0.800.06 c 4.050.30 aD5 (100 SFM)Averages within each column followed by different letters are significantly different (P<0.05) In the study of Abdul-Aziz et al., (1999) showed that 25% of soybean meal could be replaced by sunflower meal without significant effect on PER of Nile tilapia. Also, Olvera-Novoa et al., (2002) showed that replacement of fish meal by sunflower seed meal up to 50% in tilapia fry diets improved PER of Nile tilapia fry. On the other hand, Fagbenro and Davies (2000) found that replacing 67% of fish meal by sunflower meal significantly (P<0.05) reduced PER of Nile tilapia. Also, Sanz et al., (1994) found that replacement of fish meal by each of soybean meal or sunflower meal up to 40% significantly reduced SGR of trout. Chemical composition of fish Results of body composition of whole fish body are shown in Table (5), where dry matter (DM) of whole fish in three groups (D2 and the second group included fish fed the diet D3 while the third one included fish groups fed the diets D1, D4 and D5. The differences between each of the first (D2) or the second group (D3) and the third group were not significant (P>0.05). The complete substitution of soybean by sunflower meal released the highest crude protein content (60.05%) of whole fish, followed in a descending order by those fed the diets D1 (52.16%), D4 (50.94%), D3 (48.94%) and D2 (42.78%), and the differences between fish groups for protein content were significant (P<0.01). Ether extract and ash content of whole fish body found to be 16.92, 14.63, 13.92, 14.03 and 15.42% and 14.63, 15.39, 14.68, 13.61 and 15.02%, respectively for D1, D2, D3, D4 and D5 and the differences in ether extract or ash contents among fish groups fed the diets contained the graded levels of sunflower meal were not significant. Table 5. Means and standard error for the effect of increasing levels of sunflower in the diets on chemical composition of Nile tilapia Diets Dry matter (%) Crude protein (%) Ether extract (%) Ash (%)D1 (0% SFM)25.660.46 ab52.161.62 b16.921.5014.630.61D2 (25% SFM)26.240.46 a42.781.62 c14.631.5015.390.61D3 (50% SFM)24.410.46 b48.941.62 b13.921.5014.680.61D4 (75% SFM)25.850.46 ab50.941.62 b14.031.5013.610.61D5 (100 SFM)25.570.46 ab60.051.62 a15.421.5015.020.61Averages within each column followed by different letters are significantly different (P<0.05) Economical efficiency The current investigation highlights the potential of using sunflower meal for partial or complete replacement for soybean meal in Nile tilapia diets. Generally, results of the present study showed the possibility of replacing of soybean meal by sunflower meal up to 75% with no adverse effect on growth performance and feed utilization. Feed cost is considered to be the highest recurrent cost in aquaculture, often ranging from 30 to 60%, depending on the intensity of the operation. Any reduction in feed costs either through diet development, improved husbandry or other direct or indirect means is therefore decreased the total production investment and increased the net return (Collins and Delmendo, 1979; Green; 1992 and De Silva and Anderson, 1995). All other costs are almost constant, therefore, the feeding costs required to produce one kg gain in weight could be used to compare the economical efficiency of different experimental treatments. As shown in Tables (6 and 7), feed costs (LE/ton) decreased gradually with increasing substitution level of soybean meal by sunflower meal. Data presented in the same Table showed that, increasing substitution level of soybean meal by sunflower meal at 25, 50, 75 and 100% decreased feed costs by 5.04, 10.08, 15.13 and 20.17%, respectively. Compared to the control diet, feed costs (LE/kg WG) were decreased for all substitution levels of soybean meal by sunflower meal and the experimental diet D5 released the lowest feed costs while the control diet released the highest one. In conclusion, replacing 75% of soybean meal by sunflower meal reduced feeding costs by 15.13%. Table 6. Feed costs (L.E) for producing one kg weight gain by fish fed the experimental diets. DietsCosts (L.E)/ tonRelative to control (%)Decrease in feed cost (%) D1 (0%SFM)29751000D2 (25%SFM)282594.965.04D3 (50%SFM)267589.9210.08D4 (75%SFM)252584.8715.13D5 (100 SFM)237579.8320.17* Feed costs/kg weight gain = FCR costs of kg feed. Table 7. Local market price (L.E./ton) for feed ingredients used for formulating the experimental diets when the experiment was started IngredientsPrice (L.E.) / tonFish meal7000Yellow corn1250Soybean meal2500Sunflower meal1000Wheat bran1000Corn oil4000Vit. & Min. Mixture10000REFEreNCES Abbas, K., I. Ahmed and H. Rehman. 2005. Growth performance as influenced by partial replacement of fish meal with plant proteins in the diet of major carps. Indus Journal of Biological Science, 2(2):219-226. Abdul-Aziz, G. M., M. A. El-Nady, A. S. Shalaby and S. H. Mohmoud. 1999. Partial substitution of soybean meal protein by different plant protein sources in diets for Nile tilapia fingerlings. Bull. Fac. Agric. Cairo Univ., 50:189-202. AOAC 1990. Official Methods of Analysis. Association of official Analytical chemists. Washington, D. C. Collins, R. A. and M. N. Delmendo. 1979. Comparative economics of aquaculture in cages, raceways and enclosures. In: Advance in aquaculture, England, Fishing News Books. De-Silva, S. S. and T. A. Anderson. 1995. Fish nutrition in aquaculture. CHAPMAN edaw & HALL, London. Duncan, D. B. 1955. Multiple ranges and Multiple test. Biometerics, 11: 1-42. El-Saidy, D. M. and M. M. Gaber. 2002. Evaluation of dehulled sunflower meal as a partial and complete replacement for fish meal in Nile tilapia, Oreochromis niloticus (L.) diets. Proc. 1st Ann. Sci. Conf. Anim. & Fish prod. Mansoura, 24-25 Sep. 2002. FAO. 1997. Review of the state of world aquaculture. FAO Fisheries circular, 886, Rev. 1, 163, FAO, Rome, Italy. Fagbenro, O. A. and S. J. Davies. 2000. Use of oilseed meals as fish meal replacer in tilapia diets. Proc.5th Inter. Symp. On Tilapia in Aquaculture, Rio De Janeiro-Brazil, 3-7 September, 2000. Furuya, V. R. B., W. M. Furuya, C. Hayashi and C. M. Soares. 2000. Inclusion levels of sunflower meal in diets for juvenile Nile tilapia (Oreochromis niloticus). Zootecnia Tropical, 18(1):91-106. Green, B. W. 1992. Substitution of organic manure for pelleted feed in tilapia production. Aquaculture, 101:213-222. Jackson, A. J., B. S. Capper and A. J. Matty. 1982. Evaluation of some plant proteins in complete diets for the tilapia, S. Mossambicus. Aquaculture, 27:97-109. Kamarudin, M. S., k. M. Kaliapan and S. S. Siraj. 1989. The digestibility of several feedstuffs in red tilapia. Pp.118-122, in S.S. De Silva (ed.). Fish Nutrition Research in Asia. Proc. 3rd Asian Fish Nutrition network Meeting. Asian Fisheries Society, Manila, Philippines. Lim, C. and W. Dominy. 1991. Utilization of plant proteins by warm water fish. Pp. 163-172, in D. M. Akiyama and R. K. H. Tan (eds.). Proc. Of the Aquaculture Feed Processing and Nutrition Workshop. American Soybean Association, Singapore. Martinez, C. A. 1986. Advances in the substitution of fishmeal and soybean meal by sunflower meal in diets of rainbow trout (Salmo gairdneri (L.). An. Inst. Cienc. Mar. Limnol. Univ. Nac. Auton. Mex. 13:345-352. NRC (National Research Council) .1993. Nutrient requirement of fish. National Academy Press Washington D.C. Olvera-Novoa, M., L. Olivera-Castillo and C. A. Martinez-Palacion. 2002. Sunflower seed meal as a protein source in diets for Tilpaia rendalli (Boulanger, 1896) fingerlings. Aquaculture Research, 33:223-229. Osman, M. F. and S. S. Sadek. 2004. An overview of fish feed industry in Egypt-challenges and opportunities. Expert Consultation on Fish Nutrition Research and Feed Technology in Egypt. World Fish Culture Center, Abbassa, Sharkia, Egypt, 2nd December, 2004. Sanz, A., A. E. Morales, M. De la Higuera and G. Cardenete. 1994. Sunflower meal compared with soybean meal as partial substitutes for fish meal in rainbow trout (Oncorhynchus mykiss) diets: protein and energy utilization. Aquaculture, 128:287-300. SAS. 1996. SAS Procedure Guide version 6.12 Ed. SAS Institute Inc., Cary, NC, USA. Shipton, T. A. and P. J. Britz. 2001. The partial and total replacement of fish meal with selected plant protein sources in diets for South African abalone, Haliotis midae L. Journal of shellfish Research, 20(2):637-645. Tacon, A. G. J., J. L. Webster and C. A. 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