Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
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Effects of Carrot Extract on Skin Pigmentation and Serum Lysozyme Activity of Red Seabream Pagrus major

당근추출물의 참돔(Pagrus major) 치어 표피색 및 혈청 라이소자임 활성에 대한 효과

  • Kang, So Young (Department of Aqualife Medicine, Chonnam National University) ;
  • Lee, Sang-yun (Department of Aqualife Medicine, Chonnam National University) ;
  • Seo, Chan Young (Department of Aqualife Medicine, Chonnam National University) ;
  • Ahn, Mi-Jeong (College of Pharmacy and Research Institute of Pharmaceutical Sciences, Gyeongsang National University)
  • 강소영 (전남대학교 수산생명의학과) ;
  • 이상윤 (전남대학교 수산생명의학과) ;
  • 서찬영 (전남대학교 수산생명의학과) ;
  • 안미정 (경상대학교 약학과)
  • Received : 2015.08.06
  • Accepted : 2015.11.10
  • Published : 2015.12.30
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Abstract

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 ${\beta}$-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 ($a^*$) and hue ($H^*{_{ab}}$) of fish skin. CE300 showed the highest $a^*$ and the lowest $H^*{_{ab}}$, 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 $b^*$ at all three levels. In contrast, AXT100 significantly (p<0.05) increased the values of $a^*$ but decreased the value of $H^*{_{ab}}$. 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.

Keywords

References

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