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Takeuchi, Toshio; Watanabe, Takeshi; Nose, Takeshi

doi:10.2331/suisan.45.1319

Cited by 61 publications

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“…According to the regression relationship between dietary LA contents and SGR and FCR, the optimum dietary LA contents of coho salmon alevins were 1.23% and 1.25%, respectively. The results showed that the growth of alevins was greatly affected by the dietary LA levels and could be remarkably enhanced by the diets supplemented with appropriate LA, which was in agreement with previous studies in chum salmon [ 25 ], rainbow trout [ 30 ], Russian sturgeon ( Acipenser gueldenstaedti ) [ 19 ], and tilapia [ 27 ]. Stickney et al [ 44 ] found that the growth of T. aurea was improved by diets containing high soybean oil levels (which are fats with linoleic acid).…”

Section: Discussionsupporting

confidence: 91%

“…In addition, although it has been confirmed that n-6 polyunsaturated fatty acids were essential fatty acids (EFAs) for normal growth and reproduction in fish [ 19 , 20 , 21 , 22 , 23 ], the exact requirements for LA and ALA widely varied between species [ 16 ]. The optimum requirement of dietary n-6 PUFAs was estimated to be about 0.5% for eel ( Anguilla japonicas ) [ 24 ], 1.0% for chum salmon ( Oncorhynchus keta ) [ 25 ], 1.0% for coho salmon ( Oncorhynchus kisutch ) [ 26 ], and 1.14% for hybrid tilapia ( Oreochromis niloticus × Oreochromis Aureus ) [ 27 ]. Compared with mammals, fish require more n-3 PUFAs than n-6 PUFAs [ 28 , 29 ], but studies have shown that a lack of n-6 PUFAs also significantly affects salmonids growth [ 25 , 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

“…The optimum requirement of dietary n-6 PUFAs was estimated to be about 0.5% for eel ( Anguilla japonicas ) [ 24 ], 1.0% for chum salmon ( Oncorhynchus keta ) [ 25 ], 1.0% for coho salmon ( Oncorhynchus kisutch ) [ 26 ], and 1.14% for hybrid tilapia ( Oreochromis niloticus × Oreochromis Aureus ) [ 27 ]. Compared with mammals, fish require more n-3 PUFAs than n-6 PUFAs [ 28 , 29 ], but studies have shown that a lack of n-6 PUFAs also significantly affects salmonids growth [ 25 , 30 , 31 , 32 ]. More than that, all fish species probably need a small amount of n-6 PUFAs in order to form eicosanoids [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Dietary Linoleic Acid (18:2n-6) Supplementation on the Growth Performance, Fatty Acid Profile, and Lipid Metabolism Enzyme Activities of Coho Salmon (Oncorhynchus kisutch) Alevins

et al. 2022

Animals

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A 12-week feeding trial aimed to evaluate the effects of dietary linoleic acid (LA, 18:2n-6) on the growth performance, fatty acid profile, and lipid metabolism enzyme activities of coho salmon (Oncorhynchus kisutch) alevins. Six experimental diets (47% crude protein and 15% crude lipid) were formulated to contain graded LA levels of 0.11%, 0.74%, 1.37%, 2.00%, 2.63%, and 3.26%. Each diet was fed to triplicate groups of 50 alevins with an initial body weight of 0.364 ± 0.002 g, which were randomly assigned to 18 white plastic tanks (0.8 × 0.6 × 0.6 m, 240 L/tank). Fish were reared in a freshwater flow-through rearing system and fed to apparent satiation four times daily. The survival rate was not significantly different among the treatments (p > 0.05). However, the 1.37% LA group significantly improved the final body weight and specific growth rate (SGR) (p < 0.05) of alevins. The feed conversion ratio (FCR) in the 1.37% LA group was significantly lower than those in other groups (p < 0.05). The whole-body lipid content significantly decreased (p < 0.05) with dietary LA levels increasing from 0.74% to 2.00%. The fatty acid composition of the total lipid in muscle was closely correlated with those in the diets. The dietary LA level of 1.37% led to significantly higher activities of liver lipoprotein lipase (LPL) and hepatic lipase (HL) than those of other groups (p < 0.05). Hepatic malate dehydrogenase (MDH) and fatty acid synthase (FAS) decreased with the increase in the dietary LA levels from 0.11% to 1.37%. The lowest MDH and FAS activities were obtained in the 1.37% LA group (p < 0.05). This study indicated that an appropriate amount of dietary LA was beneficial for the growth and lipid metabolism of coho salmon alevins, and the results of the quadratic regression analysis of the SGR and FCR indicated that the optimal dietary LA requirements were 1.25% and 1.23% for coho salmon alevins, respectively.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Dietary Linoleic Acid (18:2n-6) Supplementation on the Growth Performance, Fatty Acid Profile, and Lipid Metabolism Enzyme Activities of Coho Salmon (Oncorhynchus kisutch) Alevins

et al. 2022

Animals

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“…On the contrary, fish fed CO 9% L diets showed high liver lipid concentration. It is well known that unbalanced n−3/n−6 ratios may increase lipid deposits in the liver (Takeuchi 1979). In other studies, it was also shown that high liver vacuolization was observed in red drum (Sciaenops ocellatus) fed dietary soya bean oil (Tucker, Lellis, Vermeer, Roberts, & Woodward, 1997).…”

Section: Discussionmentioning

confidence: 91%

Dietary lipid level and source affect metabolic responses in hybrid catfish (Pseudoplatystoma reticulatum × Leiarius marmoratus)

et al. 2020

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This study was undertaken to evaluate the effect of dietary lipid source [linseed oil (LO, rich in 18:3 n−3); corn oil (CO, rich in 18:2 n−6); olive oil (OO, rich in 18:1n−9); and fish oil (FO, rich in LC‐PUFA)] and level (9% L and 18% L) on growth, body composition and selected plasma biochemistry parameters in hybrid catfish (Pseudoplatystoma reticulatum × Leiarius marmoratus) juveniles. Moreover, liver histology (lipids, glycogen, cell vacuolization) and key metabolic enzyme activities were also evaluated. After 8 weeks of feeding, there were no differences in growth performance and whole‐body composition between groups. Plasma lipoprotein, muscle and liver composition, and G6PD and ME activity were affected by lipid level and source. No differences were observed between groups in hepatic ALT activity; however, AST activity was lower in fish fed the 9% L diets. Overall, liver and muscle fatty acid composition reflected that of diet FA composition, with increased n3/n6 ratio, high HUFA and low MUFA in fish fed FO compared with the VO diets. Higher liver glycogen content was observed in fish fed the 18% L than the 9% L diets, except for fish fed FO diet. Considering the experimental diets used, these results indicate that hybrid catfish can efficiently utilize VO supplementation as an energy source, without affecting growth performance and fillet composition.

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Lipids and Fatty Acids

Tocher

Glencross

2015

Dietary Nutrients, Additives, and Fish Health

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Cited by 61 publications

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Effect of Dietary Linoleic Acid (18:2n-6) Supplementation on the Growth Performance, Fatty Acid Profile, and Lipid Metabolism Enzyme Activities of Coho Salmon (Oncorhynchus kisutch) Alevins

Effect of Dietary Linoleic Acid (18:2n-6) Supplementation on the Growth Performance, Fatty Acid Profile, and Lipid Metabolism Enzyme Activities of Coho Salmon (Oncorhynchus kisutch) Alevins

Dietary lipid level and source affect metabolic responses in hybrid catfish (Pseudoplatystoma reticulatum × Leiarius marmoratus)

Lipids and Fatty Acids

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