Influence of soya oil blended with fish oil on growth performance and lipid profile of red seabream Pagrus major

Ishikawa M., . and Koshio S., . and Gao J., . and Abdul Kader M., . and Komilus C. F, . and Han Y. Z., . and Yokoyama S., . and Ren T., . Influence of soya oil blended with fish oil on growth performance and lipid profile of red seabream Pagrus major. pp. 17-31. ISSN 2180-1983

Continuous increase in fish feed prices due to deterioration of fish oil sources and qualitym catalyzes intensive research efforts to study alternatives for dietary fish oil such as soya oil. Being rich in linolenic acid (C18:2n-6) soya oil has a competitive edge as an arachidonic acid (ARA)precursor. A 50-day feeding trial was conducted to evaluate the effects of dietary soya oil as a substitute for fish oil on growth performance and lipid composition of juvenile red seabream Pagrus major. Four types of iso-nitrogenous experimental diets formulated in this feeding trial consisted of 100 fish oil (10F) 80 fish oil and 20 soya oil (8F2S) 60 fish oil and 40 soya oil (6F4S) and finally 40 fish oil and 60 soya oil (4F6S). All diets were fed to triplicate groups of 15 red seabream with an initial mean weight of 4.9 0.1 g twice daily to apparent satiation. Our results demonstrated that inclusion of soya oil as a lipid source to partially replace fish oil in red seabream diet led to the highest body weight gain (BWG) in 10F (837.2 2.2) followed by 8F2S (786.9 38.3) 6F4S (764.6 5.2) and 4F6S (682.0 17.2) respectively without any significant differences among 10F 8F2S and 6F4S. Soya oil inclusion also gradually decreased BWG and specific growth rate (SGR); both BWG and SGR in 4F6S were significantly lower than other treatments. Feed conversion ratio (FCR) and feed intake (FI) showed no significant differences among treatments. Survival rate of all treatments exceeded 90 although the hepatosomatic index (HSI) in 4F6S was significantly higher than other treatments and serum glutamic-oxaloacetic transaminase (GOT) increased gradually with a higher inclusion of soya oil. Lipid deposition in the whole body was the highest in fish fed with dietary 10F and decreased in relation to the elevated concentration of soya oil in diets. The ventral muscles had doubled the amount of lipid deposition as compared to dorsal muscles. Dominance of saturates among total fatty acid composition particularly C16:0 was similarly observed in the dorsal and ventral muscles as well as the liver. Saturates monoenes n-3 and ratio of n-3/n-6 observed have a similar gradient degradation in the dorsal and ventral muscles and the liver. An inverse relationship of inclusion level of soya oil on eicosapentanoic acid (EPA) and docosahexanoic acid (DHA) in both dorsal and ventral muscles including the liver was also observed. In conclusion diets not exceeding 40 soya oil are suitable as fish oil replacement in the diet of juvenile red seabream without significantly affecting the overall growth performance of this fish.

Full text available from: Official URL: https://journal.unisza.edu.my/agrobiotechnology/in...

Abstract

Continuous increase in fish feed prices due to deterioration of fish oil sources and qualitym catalyzes intensive research efforts to study alternatives for dietary fish oil such as soya oil. Being rich in linolenic acid (C18:2n-6) soya oil has a competitive edge as an arachidonic acid (ARA)precursor. A 50-day feeding trial was conducted to evaluate the effects of dietary soya oil as a substitute for fish oil on growth performance and lipid composition of juvenile red seabream Pagrus major. Four types of iso-nitrogenous experimental diets formulated in this feeding trial consisted of 100 fish oil (10F) 80 fish oil and 20 soya oil (8F2S) 60 fish oil and 40 soya oil (6F4S) and finally 40 fish oil and 60 soya oil (4F6S). All diets were fed to triplicate groups of 15 red seabream with an initial mean weight of 4.9 0.1 g twice daily to apparent satiation. Our results demonstrated that inclusion of soya oil as a lipid source to partially replace fish oil in red seabream diet led to the highest body weight gain (BWG) in 10F (837.2 2.2) followed by 8F2S (786.9 38.3) 6F4S (764.6 5.2) and 4F6S (682.0 17.2) respectively without any significant differences among 10F 8F2S and 6F4S. Soya oil inclusion also gradually decreased BWG and specific growth rate (SGR); both BWG and SGR in 4F6S were significantly lower than other treatments. Feed conversion ratio (FCR) and feed intake (FI) showed no significant differences among treatments. Survival rate of all treatments exceeded 90 although the hepatosomatic index (HSI) in 4F6S was significantly higher than other treatments and serum glutamic-oxaloacetic transaminase (GOT) increased gradually with a higher inclusion of soya oil. Lipid deposition in the whole body was the highest in fish fed with dietary 10F and decreased in relation to the elevated concentration of soya oil in diets. The ventral muscles had doubled the amount of lipid deposition as compared to dorsal muscles. Dominance of saturates among total fatty acid composition particularly C16:0 was similarly observed in the dorsal and ventral muscles as well as the liver. Saturates monoenes n-3 and ratio of n-3/n-6 observed have a similar gradient degradation in the dorsal and ventral muscles and the liver. An inverse relationship of inclusion level of soya oil on eicosapentanoic acid (EPA) and docosahexanoic acid (DHA) in both dorsal and ventral muscles including the liver was also observed. In conclusion diets not exceeding 40 soya oil are suitable as fish oil replacement in the diet of juvenile red seabream without significantly affecting the overall growth performance of this fish.

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Item Type:	Article
AGROVOC Term:	Pagrus
AGROVOC Term:	Sparidae
AGROVOC Term:	Fishes
AGROVOC Term:	Aquatic animals
AGROVOC Term:	Soybean oil
AGROVOC Term:	Vegetable oils
AGROVOC Term:	Fish oils
AGROVOC Term:	Diet
AGROVOC Term:	Feed conversion efficiency
AGROVOC Term:	Fish feeding
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/24079

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