• Title/Summary/Keyword: tuna protein

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Effect of Marine Protein Supplementation on Lipid Profile of Growing Rats Compared to Soybean Protein and Casein

  • Narayan, Bhasakar;Yamaguchi, Kohei;Hosokawa, Masashi;Fukunaga, Kenji;Nishiyama, Toshimasa;Miyashita, Kazuo
    • Food Science and Biotechnology
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    • v.18 no.6
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    • pp.1330-1335
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    • 2009
  • Although beneficial effects of dietary plant proteins on lipid metabolism are well documented, not much information exists on the influence of different seafood proteins on the lipid metabolism. The present study evaluated the effect of 2 marine proteins (tuna protein and scallop ovary proteins) in comparison to casein and soy protein in male Wistar rats. The concentration of total lipids in the plasma of rats fed experimental diets was significantly lower from that of control (278.2 mg/dL) group (p<0.05); and, the liver lipid content was not significantly different (p>0.05). Fecal excretion of cholesterol and bile acids was significantly higher in marine proteins and soy protein fed groups compared to casein only fed control (6.1 and 6.4 mg/day, respectively) group (p<0.05). No significant differences were observed in the mRNA concentrations of different transcriptional factors (p>0.05).

Utilization of Enzyme-treated Fish Meal and DHA Oil in Diets for Juvenile Atlantic Bluefin Tuna Thunnus thynnus (치어기 대서양 참다랑어(Thunnus thynnus) 사료 내 효소처리 어분과 DHA유의 이용성)

  • Ji, Seung-Cheol;Shin, Jaehyeong;Kim, Dae-Jung;Jeong, Minhwan;Kim, Jung-hyun;Lee, Kyeong-Jun
    • Korean Journal of Fisheries and Aquatic Sciences
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    • v.53 no.2
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    • pp.181-190
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    • 2020
  • This study was conducted to estimate the optimum dietary DHA oil level and replacement level of enzyme treated fish meal (EFM) with sardine fish meal for juvenile Atlantic bluefin tuna Thunnus thynnus. Four diets were used: 1) EFM75 in which 75% EFM and 4% DHA oil were applied, 2) EFM60, with 60% EFM and 15% sardine fish meal, 3) DHA2 with 2% of DHA oil, and 4) SL as a raw fish feed. In a feeding trial, juvenile bluefin tuna (body weight 30.1 g) were randomly stocked into four experimental tanks (69 tones) and fed the experimental diets for 13 days. Fish weight gain was higher in the EFM75 and SL groups than in the DHA2 and EFM60 groups. The feed conversion ratio was lower in the EFM75 and DHA2 groups than in the EFM60 and SL groups. Survival was higher in fish fed the formulated diet groups (EFM75, EFM60 and DHA2) than in fish fed SL. This study clearly indicates that up to 10% dietary sardine fish meal can be used in juvenile T. thynnus diets, with an optimum dietary DHA oil level of approximately 3%.

Differential Effects of Cod Proteins and Tuna Proteins on Serum and Liver Lipid Profiles in Rats Fed Non-Cholesterol- and Cholesterol-Containing Diets

  • Hosomi, Ryota;Maeda, Hayato;Ikeda, Yuki;Toda, Yuko;Yoshida, Munehiro;Fukunaga, Kenji
    • Preventive Nutrition and Food Science
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    • v.22 no.2
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    • pp.90-99
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    • 2017
  • Fish muscles are classified into white and red muscles, and the chemical composition of the two fish muscles have many differences. Few reports have assessed the health-promoting functions of white fish muscle proteins (WFP) and red fish muscle proteins (RFP). We therefore evaluated the mechanisms underlying the alteration of lipid profiles and cholesterol metabolism following the intake of WFP prepared from cod and RFP prepared from light muscles of tuna. Male Wistar rats were divided into six dietary groups: casein (23%), WFP (23%), and RFP (23%), with or without 0.5% cholesterol and 0.1% sodium cholate. Compared to the WFP-containing diet, the RFP-containing diet supplemented with cholesterol and sodium cholate significantly increased serum and liver cholesterol contents. However, in the RFP groups, an alteration in cholesterol metabolism including an increased tendency to excrete fecal sterols and hepatic cholesterol $7{\alpha}$-hydroxylase was related to the reduction of hepatic cholesterol contents. This phenomenon might be related to the tendency of an increased food intake in RFP-containing diets. These results highlight the differential effects of WFP and RFP on serum and liver lipid profiles of Wistar rats fed non-cholesterol- or cholesterol-containing diets under no fasting condition.