Dietary effect of varying linseed oil compositions on growth response, survival and polyunsaturated fatty acid levels in Tilapia (Oreochromis niloticus)

International Journal of Fisheries and Aquaculture Pub Date : 2017-04-30 DOI:10.5897/IJFA2017.0621

K. Omolo, A. Onyango, G. Magoma, J. Munguti, K. Ogila

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引用次数: 2

Abstract

The present study evaluated the impact of varying dietary linseed oil composition on growth, survival and tissue polyunsaturated fatty acids (PUFA) profiles in Nile tilapia (Oreochromis niloticus). Five iso-nitrogenious diets with varying linseed and sunflower oil concentrations were formulated and fish fed twice daily to for 3 months. Commercial diet was used as a control in triplicate tanks set for each diet treatment. Growth parameters were measured from changes in body weight and length. A 75:25 ratio of sunflower oil to linseed oil gave a better survival and specific growth rate than 100% linseed oil or 100% sunflower oil. Tissue PUFA composition were determined using gas chromatography. High dietary linseed oil composition (100%) resulted into significantly high (P 50% reduced growth and survival rate in tilapia, however, it increased tissue accumulation of essential fatty acids which also increased with the length of feeding period. Key words: Growth, Tilapia, n3 fatty acids, linseed oil, polyunsaturated fatty acids (PUFA).

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饲料中不同亚麻籽油成分对罗非鱼生长反应、存活率及多不饱和脂肪酸水平的影响

本研究评估了饲料中不同亚麻籽油成分对尼罗罗非鱼(Oreochromis niloticus)生长、存活和组织多不饱和脂肪酸(PUFA)谱的影响。配制了5种不同亚麻籽和葵花籽油浓度的等氮饲料，每天喂鱼两次，持续3个月。每个饲粮处理设3个槽，以商品饲粮为对照。生长参数是通过体重和长度的变化来测量的。葵花籽油与亚麻籽油的比例为75:25，比100%亚麻籽油或100%葵花籽油的存活率和特定生长率更高。采用气相色谱法测定组织中多聚脂肪酸的组成。高饲粮亚麻籽油含量(100%)显著降低罗非鱼的生长和成活率(P < 50%)，但增加了罗非鱼组织中必需脂肪酸的积累，且随饲喂期的延长而增加。关键词:生长，罗非鱼，n3脂肪酸，亚麻籽油，多不饱和脂肪酸

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International Journal of Fisheries and Aquaculture

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