Effects of vitamin A on growth,serum anti-bacterial activity and transaminase activities in the juvenile Japanese flounder,Paralichthys olivaceus |
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| Institution: | 1. Hubei Key Laboratory of Animal Nutrition and Feed Science, Wuhan Polytechnic University, Wuhan, Hubei 430023, China;2. College of Animal Science and Technology, Anhui Agricultural University, Hefei, Anhui 230000, China;3. Freshwater Aquaculture Collaborative Innovation Center in Hubei Province, Wuhan, Hubei 430070, China;1. State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, The Chinese Academy of Sciences, Wuhan 430072, China;2. Graduate University of the Chinese Academy of Sciences, Beijing 100049, China;3. Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan 430070, China;1. Departamento de Zootecnia, Setor de Piscicultura, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, 13418-900 Piracicaba, SP, Brazil;2. PPG Ciência Animal e Pastagens, Departamento de Zootecnia, Escola Superior de Agricultura “Luiz de Queiroz”, Universidade de São Paulo, 13418-900 Piracicaba, SP, Brazil;1. Fisheries Department, Faculty of Marine Natural Resources, Khoramshahr Marine Science and Technology University, Iran;2. Artemia and Aquatic Research Institute, Urmia University, Urmia, Iran;3. South Iranian Aquaculture Research Center, Ahwaz, Iran;4. Department of Clinical Sciences, Faculty of Veterinary Medicine, Shahid Chamran University of Ahwaz, Ahwaz, Iran;5. IRTA, Centre de Sant Carles de la Rápita (IRTA-SCR), Unitat de Cultius Experimentals, Crta. del Poble Nou Km 5.5, Sant Carles de la Rápita, Spain |
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| Abstract: | The present study examined the effects of dietary vitamin A (vitA) deficiency and excess on growth, serum anti-bacterial activity and serum enzyme activities of juvenile Japanese flounder, Paralichthys olivaceus. Three semi-purified diets containing 0, 10,000 and 25,000 International Units of vitA per kg of diet (IU vitA/kg) were fed to juvenile Japanese flounder (initial weight 1.59 g) for 120 days. At the end of the feeding trial, blood samples were taken from the fish for haematocrit, serum biochemical analysis and serum anti-bacterial activity. Growth performance, in terms of weight gain and specific growth rate, was improved significantly (P < 0.05) with the addition of vitA to the diet. Total retinol contents in the liver increased with increasing dietary vitA levels. Haematocrit values did not show significant difference among the groups, but the values tended to increase with increasing dietary vitA levels. Serum total protein and albumin contents, and glutamyl oxaloacetic transaminase (GOT) activity tended to be lower in fish fed with 10,000 IU vitA/kg but significant difference was not observed among the groups. Serum total bilirubin content was significantly higher in treatment with no vitA than the other treatments. Glutamyl pyruvic transaminase (GPT) activity was significantly higher in the fish fed 25,000 IU vitA/kg than the other two groups. Serum anti-bacterial activity was significantly higher in the groups fed with 10,000 and 25,000 IU vitA/kg than that of the fish fed with 0 IU vitA/kg. These data suggest that dietary vitA significantly improved the growth performance and anti-bacterial activity of juvenile Japanese flounder. The tendency observed of high values in the blood serum parameters of the fish the diets of 0 and 25,000 IU vitA/kg after 120 days, suggests some negative effect on the liver (the main vitA storage site). |
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