Growth, Fatty Acid Composition and Lipid Deposition of Juvenile Turbot (Scophthalmus maximus L.) Fed Diets with Fish Oil Replacement by Rapeseed Oil

PENG Mo, XU Wei, MAI Kangsen, ZHOU Huihui, TAN Peng, DU Jianlong, AI Qinghui

doi:10.3969/j.issn.1006-267x.2015.03.013

2015 , Vol. 27 >Issue 3: 756 - 765

DOI: https://doi.org/10.3969/j.issn.1006-267x.2015.03.013

Aquaculture Nutrition

Growth, Fatty Acid Composition and Lipid Deposition of Juvenile Turbot (Scophthalmus maximus L.) Fed Diets with Fish Oil Replacement by Rapeseed Oil

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1. Key Laboratory of Aquaculture Nutrition and Feed of Ministry of Agriculture, Key Laboratory of Mariculture of Ministry of Education, Ocean University of China, Qingdao 266003, China;
2. School of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China

Received date: 2014-09-22

Online published: 2015-03-18

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Abstract

A 92-d feeding experiment was conducted to investigate the effects of dietary fish oil (FO) replacement by rapeseed oil (RO) on growth, fatty acid composition and lipid deposition of juvenile turbot (Scophthalmus maximus L.). Four isonitrogenous and isolipidic practical diets were formulated with RO replacing 0, 33.3%, 66.7% and 100.0% FO, respectively. A total of 420 juvenile turbot with the initial body weight of (5.89±0.02) g were randomly distributed into 4 groups with 3 replicates per group and 35 fish per replicate, and the fish in each group were randomly fed one of four experimental diets. The results showed as follows: 1) with the RO replacement level increasing, the final body weight and specific growth rate of turbot were decreased, while the hepatosomatic index was increased. The final body weight and specific growth rate in 100.0% RO group were significantly higher than those in 100.0% FO group (P<0.05), while the hepatosomatic index in 100.0% RO group was significantly increased compared with 100.0% FO group (P<0.05). The survival rate,feed conversion rate, feed intake ratio and apparent net protein utilization of turbot were not significantly affected by RO replacement level (P>0.05). 2) RO replacement level had no significant effects on body composition, muscle lipid content and dietary lipid apparent digestibility of turbot (P>0.05), but had significant effect on liver lipid content of turbot (P<0.05). The liver lipid content in 66.7% and 100.0% RO groups was significantly higher than that in 100.0% FO group (P<0.05). 3) Fatty acid composition in liver and muscle showed a positive correlation with dietary fatty acid composition. Compared with 100.0% FO group, the contents of C18:2n-6 (linoleic acid) and C18:3n-3 (α-linolenic acid) in muscle and liver were significantly increased (P<0.05), while the contents of C20:5n-3 (eicosapntemacnioc acid) and C22:6n-3 (docosahexaenoic acid) in muscle and liver were significantly decreased (P<0.05). These results suggest that on basis of nutritional quality, the level of RO to replace FO in the turbot diet should be lower than 66.7%.

Key words： rapeseed oil; fish oil; fatty acid composition; lipid deposition; turbot

Cite this article

PENG Mo, XU Wei, MAI Kangsen, ZHOU Huihui, TAN Peng, DU Jianlong, AI Qinghui . Growth, Fatty Acid Composition and Lipid Deposition of Juvenile Turbot (Scophthalmus maximus L.) Fed Diets with Fish Oil Replacement by Rapeseed Oil[J]. Chinese Journal of Animal Nutrition, 2015 , 27(3) : 756 -765 . DOI: 10.3969/j.issn.1006-267x.2015.03.013

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