Coloring Performance of Carassivs Auratus with Natural Astaxanthin

The effects of contents and feed time of astaxanthin on coloring performance of Carassius auratus were studied in this paper.The results showed that the astaxanthin ratio in feed and the different feed time have highly effect on the pigment sediment of Carassius auratus.The pigment content in dry fish was improved with increasing astaxanthin concentration in feed in the same feed time.For both the control and the test groups,the pigment contents in the unit dry fish showed increase trend with prolonging feed time.Within 0~15 days,the speed of pigment accumulate in the unit dry fish was improved with increasing the astaxanthin ratio in feed.For the samples in same group,the speed of pigment accumulate in the unit dry fish increased fast in the periods of 0~15 days and 45~60 days,while increased slowly during 15~45 days.