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http://dx.doi.org/10.7847/jfp.2015.28.3.157

Effects of Carrot Extract on Skin Pigmentation and Serum Lysozyme Activity of Red Seabream Pagrus major  

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)
Publication Information
Journal of fish pathology / v.28, no.3, 2015 , pp. 157-164 More about this Journal
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
Carrot; Astaxanthin; Red seabream; Pigmentation; Lysozyme;
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