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Effects of Carrot Extract on Skin Pigmentation and Serum Lysozyme Activity of Red Seabream Pagrus major
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  • Journal title : Journal of fish pathology
  • Volume 28, Issue 3,  2015, pp.157-164
  • Publisher : The Korean Society of Fish Pathology
  • DOI : 10.7847/jfp.2015.28.3.157
 Title & Authors
Effects of Carrot Extract on Skin Pigmentation and Serum Lysozyme Activity of Red Seabream Pagrus major
Kang, So Young; Lee, Sang-yun; Seo, Chan Young; Ahn, Mi-Jeong;
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The effect of dietary carrot extract on skin pigmentation and non-specific immunity of red seabream was evaluated in a six-week feeding trial compared to that of astaxanthin. Fish were fed different experimental diets supplemented with three levels of carrot extract (30, 100, and 300 mg -carotene/kg diet or CE30, CE100, and CE300), 100 mg astaxanthin/kg diet (AXT100), or a diet without supplement as control for 6 weeks. Our results revealed that the specific growth rate and feed conversion rate were not significantly (p>0.05) affected by carrot extract or astaxanthin supplementation for 6 weeks. After 3 weeks of feeding, the dietary carrot extract significantly (p<0.05) influenced the redness () and hue () of fish skin. CE300 showed the highest and the lowest , suggesting that carrot extract increased the redness of skin color. However, after 6 weeks of feeding, dietary carrot extract significantly (p<0.05) increased the values of yellowness at all three levels. In contrast, AXT100 significantly (p<0.05) increased the values of but decreased the value of . Only CE300 significantly (p<0.05) increased the serum lysozyme activity. These findings suggest that dietary carrot extract can be utilized as a natural feed additive to improve skin pigmentation and health condition of fish.
Carrot;Astaxanthin;Red seabream;Pigmentation;Lysozyme;
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