Effects of Dietary Phosphatidylcholine on Growth ...

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E-mail: [email protected]. Archive of SID · www.SID.ir ..... Bell, J.G., D.R. Tocher, B.M. Farndale, D.I. Cox, R.W. McKinney and J.R. Sargent, 1997.
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Journal of Fisheries, Iranian Journal of Natural Res., Vol. 64, No. 1, 2011. pp. 41-53

Effects of Dietary Phosphatidylcholine on Growth Parameters, Liver Fatty acid Composition of Caspian Salmon (Salmo trutta caspius) Alevin E. Sotoudeh1, A. Abedian Kenari2 and M. Habibi Rezaei3 1 M.Sc. Student, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, I.R. Iran 1 Associate Prof., Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, I.R. Iran 3 Assistant Prof, College of Science, University of Tehran, I.R. Iran (Received: 19 October 2009, Accepted: 08 March 2011)

Abstract This study was carried out to survey effects of dietary Phosphatidylcholine levels on growth parameters, survival and liver fatty acid composition of the Caspian salmon (Salmo trutta caspius) alevin with an average weight of 0.8 ± 0.12 g for 5 weeks. Phosphatidylcholine in 4 levels, i.e. 0, 2, 4 and 6 percent were added to diets. Alevin were reared in a recycling system with 20 percent daily water exchange using biofilter and zeolite. Alevin were fed saturated 6 times a day. Growth parameters of those fed 4 and 6 percent Phosphatidylcholine were significantly different of those fed 0 and 2 % treatments (P < 0.05). Hepatosomatic index (HSI) and viscerosomatic index (VSI) were affected significantly (P < 0.05) by different phosphatidylcholine levels. Changes of fatty acid composition of the liver were similar to those of the diet fatty acid composition, and linoleic acid (18:2n-6), arachidonic acid (20:4n-6) and polyunsaturated fatty acids increased significantly. Survival rate was high in all treatments with no significant difference among them (P > 0.05). Results indicated that phosphatidylcholine has positive and significant effects on growth, nutrition factors and liver fatty acid composition of the Caspian salmon alevin and its optimal dietary level for this size is 4 percent at this stage. Keywords: Caspian salmon, Alevin, Phosphatidylcholine, liver fatty acid

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