Effects of vitamin E on growth, survival and fecundity of zebrafish (Danio rerio)

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1 International Sholars Journals Afrian Journal of Fisheries Siene ISSN Vol. 3 (2), pp , February, Available online at International Sholars Journals Author(s) retain the opyright of this artile. Full Length Researh Paper Effets of vitamin E on growth, survival and feundity of zebrafish (Danio rerio) *Mohammed R. Larijani, Gholam Seyhoun and Reza Alizadeh Department of Fishery, Faulty of Agriulture, University of Tehran, PO. Box: 4111, Tehran, Iran. Aepted 13 January, 2015 The aim of this study was to evaluate the effets of dietary vitamin E (α-toopherol) in 4 levels (100, 300, 500 and 1000 mg asorbi aid kg -1 ) with 1 ontrol group (0 mg kg -1 ) on growth, survival, feundity and egg diameter in the zebrafish, Danio rerio. Zebrafish were divided into 5 treatments eah tripliated, and fed with one of the five diets for 20 weeks. There were no signifiant differenes in egg diameter observed between the treatments. The survival rate of zebrafish fed the diet ontaining 1000 mg kg -1 vitamin E was higher than other groups. In the vitamin E treatments, the body weight inrease (BWI), speifi growth rate (SGR) and feundity of zebrafish inreased signifiantly with inreasing levels of vitamin E (P < 0.05). The signifiane of the results herein obtained underlined the importane of diet in the reprodutive proess, supporting the hypothesis that feed additives an improve feundity. Considering that the zebrafish has been learly established as a vertebrate model for biomedial researh, these results support the potentiality of feed additives suh as vitamins an improve reprodution in all vertebrates, inluding humans. Key words: Zebrafish, vitamin E, growth performane, egg diameter, survival, feundity. INTRODUCTION Nutrients like fatty aids, amino aids, minerals and vitamins have lear affets on reprodution as well as growth in fish. Vitamin E is a lipid-soluble vitamin that omprises four toopherols and four tootrienols in nature. Among them, α-toopherol has the highest vitamin E ativity (NRC, 1993). Other than its vitamin E ativity, α-toopherol is a potent biologial antioxidant that an protet biologial membranes and lipid omponents ontaining unsaturated fatty aids against attak from oxygen free radials. A dietary requirement of vitamin E has been demonstrated in a number of fish. Vitamin E was originally onsidered as a dietary fator of animal nutrition, whih has an importane in reprodution. In aquaulture, vitamin E is used for the fortifiation of feed to improve the growth, resistane to stress and disease as well as for survival of fish and shrimp (Vismara et al., *Corresponding author. rahulari@yahoo.om 2003). As in higher vertebrates, vitamin E defiieny affets reprodutive performane, ausing immature gonads and lower hathing rate and survival of offspring (Izquierdo et al., 2001). The signifiane of vitamin E in fish reprodution was onfirmed in earlier studies. In a study of the effets of vitamin E and growth hormone on gonadal maturity in the ommon arp (Cyprinus arpio), dietary vitamin E resulted in a higher gonadosomati index, larger ova, and more eggs with higher hathability than the ontrol (Gupta et al., 1987). Further, spawning was omplete in fish fed a diet supplemented with vitamin E but partial in the majority of fish fed diets laking vitamin E (Gupta et al., 1987). Vitamin E is essential for fertility and reprodution in fish and fish annot synthesize vitamin E, so the maternal dietary ontent of eah prior to oogenesis is an important determinant of reprodutive fitness (NRC, 1993). The nutritional status of the broodstok an affet offspring quality. The aumulation of essential nutrients suh as essential fatty aids and vitamins are dependent

2 Mohammed et al. 191 on the nutrient reserves in the mother animal, and onsequently on the dietary input of broodstok in the period preeding gonadogenesis (Blom and Dabrowski, 1996; Bell, et al., 1997). Food or vitamin shortages may have aused suspension of vitellogenesis, resorption of ooytes, and dereased feundity in the goldfish, Carassius auratus (L.) (Bekker, 1958). The ommerial prodution of ornamental tropial fish is gaining momentum in many regions of the world. Zebrafish (Danio rerio, Cyprinidae) serves as an important vertebrate model for studying development, genetis, prodution and diseases (Kimmel, 1989; Briggs, 2002; Ingham, 1997; Ward and Lieshke, 2002). Zebrafish is a group-spawning, egg-sattering member of the Cyprinid family found throughout southern Asia (Laale, 1977). Its ease of maintenane and ability to produe large numbers of transparent eggs has made it an ideal speies for studies (Grunwald and Eisen, 2002). The main purpose of the present experiments was to investigate the influene of different vitamin E levels for Zebrafish. This was onsidered an important task beause nutritional studies on feundity and fertility in fish have been mainly onerned with only quantity of food. MATERIALS AND METHODS Aquaria Fifteen aquaria ( m) were used in this experiment. The water temperature was kept at 26±2 C. The aquarium water was permanently aerated. Before starting the experiments water was dehlorinated. One a week ph was heked and total hardness in water (dh) was examined titrimetrially. Oxygen ontent was reorded weekly. Experimental diets The basal experimental diets were formulated with the ommonly available ingredients (Table 1). Five graded levels of vitamin E (átoopherol) at 0, 100, 300, 500 and 1000 mg Kg -1 diets were inluded in the basal diet (Vitamin E was supplemented separately to the basal diet at the expense of wheat flour). The ingredients were grinded, milled, weighed, mixed and pelleted with a meat miner through a 0.8 mm die. After old pelleting, the feeds were air dried and put in an air-tight ontainer. All diets were stored at -20 C until fed. Experimental fish and feeding regime Zebrafish (D. rerio) were obtained from an Institute of Ornamental Fish Hathery (Golestan), and were transferred to the plae of experiment and alimated for 2 weeks. Zebrafish were fed a vitamin E-free diet (a basal diet whih finally served as the ontrol diet) for 2 weeks while alimating to experimental onditions. Twenty uniform fish were randomly seleted and stoked into eah of the 15 aquariums, whih in turn were randomly assigned in tripliate to eah treatment. Fish were fed approximately 5% of their body weight daily, and it was divided into four equal feedings (08:00, 12:00, 16:00 and 20:00 h) for 5 months. Feed preparation was arried out bi-weekly to prevent long storage. The all of fish from eah aquarium were ounted and weighed at 2-week intervals to monitor growth and adjust feed rations. Mortalities and general health were reorded. Any dead fish were removed and not replaed during the experiment. Calulations and statistial analysis Sampling was arried out fortnightly. The following variables were alulated: Body weight inrease (BWI) = W t W0 (Taon, 1990) Speifi growth rate (SGR) = (ln W t ln W0) 100 t -1 (Hevroy et al., 2005) Body weight gain (BWG) = (Wt W0) Nt (De Silva and Anderson, 1995) Survival = Nt 100 N0-1 (Ai et al., 2006) Gonadosomati Index = GW/BWt 100 Wt and W0 were final and initial fish weights (g), respetively; Nt and N0 were final and initial numbers of fish in eah repliate, respetively, t is the experimental period in days, GW was gonad weight and BW was final body weight (g). Pregnant females were reognized by the onvex abdomen and other signs. At the estimated time for parturition, 3 females from eah experiment were killed by triaine methanesulphonate. Fixation was ahieved in 4% formalin. Total body length and total body weight (somati weight plus gonad weight) (Lagler et al., 1962) were reorded. The number of fish ooyte (feundity) of eah female was ounted and finally the egg diameters were measured (15 ooytes per feundity). The data obtained from the trial were subjeted to one-way analysis of variane (ANOVA) and T-test (using SPSS 16.0 programme) to test for effets of dietary treatments. When ANOVA identified signifiant differene among groups, multiple omparison tests among means were performed using Dunan s new multiple range test. For eah omparison, statistially signifiant differenes were determined by setting the aggregate type I error at 5% (P < 0.05). RESULTS A signifiantly greater (P < 0.05) inrease in speifi growth rate (SGR), and body weight inrease (BWI) was reorded in diets supplemented with vitamin E levels of 500 mg kg -1 diet when ompared to the ontrol diet, 100 and 300 mg kg -1 vitamin E diet (Figures 1 and 2). SGR and BWI were the highest for zebrafish fed the supplemented diet using 500 mg kg -1 vitamin E diet (2.83 and respetively) followed by 1000 mg kg -1 vitamin E diet (2.77 and respetively) and 300 mg kg -1 vitamin E diet (2.57 and respetively). For body weight gain (BWG), a signifiant differene was observed between zebrafish fed the supplemented diet using 500 and 1000 mg kg -1 vitamin E diet ompared to the other groups (P < 0.05). The highest BWG was observed in fish fed the 1000 mg kg -1 vitamin E diet (Figure 3). The survival rate of zebrafish fed with diets ontaining graded levels of vitamin E are shown in Figure 4. The

3 192 Afr. J. Fish. Si. Table 1. Formulation and proximate omposition of the basal diets (dry weight). Ingredient (%) Fish meal 60 Barley meal 7.5 Wheat flour 7.5 Corn meal 7.5 Soybean meal 7.5 Mineral mixture a Olive oil 5 2 Fish oil 3 Proximate omposition Moisture 13.4 Ash 11.5 Crude protein 38.7 Crude lipid 13 Crude fiber 3.3 Carbohydrate 19 a Mineral mixture ontain (mg/g mixture): Ca, ; P, 90000; Cu, 600; Zn, 300; Co, 300; I, 100; Co3-2, 100; Mg, ; Se, 1; Na, 60000; Mn; 200; Fe, Vitamin A, IU; vitamin D3, Figure 1. Effets of vitamin E on body weight inrease of zebrafish. survival rate of zebrafish fed the diets ontaining 500 and 1000 mg kg -1 vitamin E was higher than other groups and the highest survival rate was observed in 500 mg kg -1 vitamin E and lowest survival rate was observed in 0 mg kg -1 vitamin E (100 and 80% respetively). Mean values of GSI inreased with inreasing the level of vitamin E, and the results were signifiant (P < 0.05). The results are shown in Figure 5. In egg diameter there were no signifiant differenes between groups, (Figure 6). A signifiantly higher feundity existed in the group of

4 Mohammed et al. 193 Figure 2. Effets of vitamin E on speifi growth rate of zebrafish. Figure 3. Effets of vitamin E on body weight gain of zebrafish. fish fed 500 mg kg -1 vitamin E diet ompared with groups fed 0, 100 and 300 mg kg -1 vitamin E diets. There was no signifiant differene between fish feundity in fish fed 500 and 1000 mg kg -1 AA diet and between fish fed 0 and 100 mg kg -1 AA diet (Figure 7). DISCUSSION The requirement for vitamin E as an essential dietary omponent in fish has long been reognized, and minimum requirements for many fish speies have already

5 194 Afr. J. Fish. Si. Figure 4. Effets of vitamin E on survival rate of zebrafish. 12 GSI (%) 10 a b Figure 5. Effets of vitamin E on gonadosomati index of zebrafish. already been established. Naziroglu et al. (2003) mentioned that vitamin E espeially á-toopherol form, has very effetive role on immune system response, and it is one the few nutrients for whih supplementation with higher than reommended levels enhane ertain aspets of immune funtion in fish. The study showed that vitamin E signifiantly influenes growth and reprodutive performane in zebrafish. These results agree with the result of James et al. (2008) whih demonstrated that growth and feundity inreased in female goldfish (Carassius auratus) with inreased dietary vitamin E levels, but these results was not onfirm

6 Mohammed et al. 195 Egg Diameter a ab ab ab ab Figure 6. Effets of vitamin E on egg diameter of zebrafish. Feundity b a ab Figure 7. Effets of vitamin E on feundity of zebrafish. the findings of Boggio et al. (1985) and Kiron et al. (2004), that no differene ourred in the growth fators like weight gain of fish fed diets ontaining either lower (100 mg kg -1 ) or higher level of vitamin E (1000 mg kg -1 diet). In our study, the growth of zebrafish improved signifiantly with inreasing supplementation of dietary vitamin E. These results further onfirm that zebrafish need adequate exogenous vitamin E to maintain normal growth and physiologial funtions. Growth is a funtion of both the nutritional quality and the rate of onsumption, among other things (Stikney, 2000). In this researh trial, a diet ontaining 500 mg of vitamin E kg -1 diet was found to be the more optimal dietary requirement for zebrafish than other groups. A major funtion of vitamin E is to prevent peroxidation of polyunsaturated fatty aids of phospholipid and holesterol in ellular and subellular membranes. In

7 196 Afr. J. Fish. Si. general, beause of peroxidative damage to ellular membranes nutritional musular dystrophy, fatty liver degeneration, anemia, exudative diathesis, erythroyte hemolysis, hemorrhages, depigmentation and redution of fertility are observed in fish in the defiieny of vitamin E (He and Lawrene, 1993). The diet without vitamin E supplementation dereased the speifi growth rate of zebrafish in ompared to other groups that ontain vitamin E, and this is in aordane with studies onduted by Mehrad and Sudagar who also observed delining speifi growth rate with vitamin E defiient diet for guppy (Poeillia retiulate). A signifiant differene in survival rate was observed between the treatments ontaining vitamin E. This result did not onform to a study onduted by Mourente et al. (2002) in gilthead sea bream, they found that addition of vitamin E in diets ontaining oxidized oil did not improve the survival of sea bream, and also not onform to a study onduted by Mehrad and Sudagar (2010) on P. retiulate. In this study a signifiantly higher feundity existed in group of fish fed 500 mg kg -1 vitamin E diet ompared with other groups. The importane of vitamin E in fish reprodution has been reported. For example, vitamin E aused higher gonadosomati index, larger ova, and more eggs than a ontrol in a study on the effet of vitamin E and growth hormone on the gonadal maturity of freshwater fish (Cyprinus arpio) (Gupta et al., 1987). In addition, omplete spawning ourred in fish fed a diet ontaining vitamin E, but only partial spawning ourred in the fish fed diets without vitamin E (Gupta et al., 1987). In a different study, Sutjaritvongsanon (1987) found better gonad development and spawning for goldfish (C. auratus) fed with added vitamin E. Conlusions The signifiane of the results herein obtained underlined the importane of diet in the reprodutive proess, supporting the hypothesis that feed additives an improve feundity. Considering that the zebrafish has been learly established as a vertebrate model for biomedial researh, these results support the potentiality of feed additives suh as vitamins, frequently used in the human diet, as a new tehnology to improve reprodution in all vertebrates, inluding humans. REFRENCES Ai Q, Mai K, Tan B, Xu W, Duan Q, Ma H, Zhang L (2006). Replaement of fish meal by meat and bone meal in diets for large Yellow roaker (Pseudosiaena roea). Aquaulture, 260: Bekker VE (1958). On the influene of environmental onditions on gonad development and spawning intensity in the goldfish (Carassius auratus L.). DokI. Akad. Nauk SSSR Biol. Si. Set. (Engl. Trans. Ser.), 117: Bell JG, Famdale BM, Brue MP, Navas JM, Carrillo M (1997). Effets of broodstok dietary lipid on fatty aid omposition of eggs from sea bass (Dientrarhus labrax). Aquaulture, 149: Blom JH, Dabrowski K (1996). Asorbi aid metabolism in fish: Is there a maternal effet on the progeny? Aquaulture, 147: Boggio RW, Hardy J, Babbitt K, Brannon EL (1985). The influene of dietary lipid soure and alpha-toopheryl aetate level on produt quality of rainbow trout (Salmo gairdneri). Aquaulture, 51: Briggs JP (2002). The zebrafish: a new model organism for integrative physiology. Am. J. Physiol. Regul. Integr. Comp. Physiol., 282: R3- R9. De Silva SS, Anderson TA (1995). Fish nutrition in Aquaulture, Chapman & Hall. Press London., p. 319 Grunwald DJ, Eisen JS (2002). Headwaters of the zebrafish emergene of a new model vertebrate. Nat. Rev. Genet., 3: Gupta SD, Khan HA, Bhowmik RM (1987). Observations on the effet of vitamin E and growth hormone on the gonadal maturity of arps. J. Inland Fish. So. India, 19(2): He H, Lawrene AL (1993). Vitamin E requirement of Penaeus vannemei. Aquaulture, 118: Hevroy EM, Espe M, Waagbo R, Sandness K, Rund M, Hemre G (2005). Nutrition utilization in Atlanti salmon (Salmo salar) fed inreased level of fish protein hydrolyses during a period of fast growth. Aquaul. Nutr., 11: Ingham PW (1997). Zebrafish genetis and its impliations for understanding vertebrate development. Hum Mol Genet 6: Izquierdo MS, Fernández-Palaios H, Taon AGJ (2001). Efffet of broodstok nutrition on reprodutive performane of fish. Aquaulture, 197: James R, Vasudhevan I, Sampath K (2008). Effet of Dietary Vitamin E on Growth, Feundity, and Leukoyte Count in Goldfish (Carassius auratus). Israeli J. Aqua. Bamidgeh, 60(2): Kimmel CB (1989). Genetis and early development of zebrafish. Trends Genet., 5: Kiron V, Puangkaew J, Ishizaka K, Satoh S, Watanabe T (2004). Antioxidant status and nonspeifi immune responses in rainbow trout (Onorhynhus mykiss) fed two levels of vitamin E along with, three lipid soures. Aquaulture, 234: Laale HW (1977). The biology and use of zebrafish, Brahydanio rerio, in fisheries researh. A literature review. J. Fish Biol., 10: Lagler KF, Bardah JE, Miller RR (1962). Ihthyology: The Study of Fishes. John Wiley and Sons, In., New York, London; Toppan Co. Ltd., Tokyo, p Mehrad B, Sudagar M (2010). Dietary vitamin E requirement, fish performane and reprodution of guppy (Poeilia retiulata). AACL Bioflux, 3(3): Mourente G, Dı az-salvago E, Bell JG, Toher DR (2002). Inreased ativities of hepati antioxidant defene enzymes in juvenile gilthead sea bream (Sparus aurata L.) fed dietary oxidized oil: attenuation by dietary vitamin E. Aquaulture, 214: Naziroglu M, Ispir U, Yonar ME (2003). Effets of vitamin E on immune response in fish. Kafkas Univ Vet Fak Derg, 9(1): NRC (National Researh Counil) (1993). Nutrient requirements of Fish. National Aademy Press, Washington, DC, p Stikney RR (2000). Enylopedia of aquaulture. John Wiley and Sons, In: New York, 960 p. Sutjaritvongsanon S (1987). Level of vitamin E ontent suitable for gonad developing and spawning of goldfish, Carassius auratus (Linn.). Abstrats of Master of Siene Theses Fisheries Siene, Notes Fa. Fish. Kasetsart Univ., Bangkok, 12: 2. Taon AGJ (1990). Standard method for nutritional and feeding of farmed fish and shrimp. Argent librations press. Redmond, Wash, 1: 117 Vismara R, Vestri S, Kusmi C, Brarsanti L, Gualtieri P (2003). Natural vitamin enrihment of Artemia salina fed freshwater and marine miroalgae. J. Appl. Phyol., 15: Ward AC, Lieshke GJ (2002). The zebrafish as a model system for human disease. Front Biosi., 7: Author(s) retain the opyright of this artile.

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