| Summary: | 碩士 === 國立臺灣海洋大學 === 水產養殖學系 === 103 === In this experiment, red cherry shrimp (Neocaridina denticulata sinensis var. red) and crystal red shrimp (Caridina serrata var. red) were used to test the color enhancement in three experiments. In experiment 1 the treatment groups were divided into thirteen treatments with carotenoid concentrations of 50 mg/kg. First group was basic, and the second group added five synthesize carotenoids respectively. Third group added four nature carotenoids respectively, and the fourth group were three commercial feeds. In experiment 2 and 3, the treatment groups divided into eight treatments. First group was commercial feed, and the second group added three synthesize carotenoids respectively. Third group added two nature carotenoids respectively, and the fourth group were two types mixed with synthesize and nature carotenoids. The shrimp were photographed every seven days during four weeks. The commercial feed used to a control group in three experiments. The results of the experiment 1 with red cerry shrimp showed that astaxanthin was better than other the treatment and the redness parameters were enhanced. Adding canthaxanthin treatments in the L * (light) value was higher than others, and the skin color was orange. The result of experiment 2 with crystal red shrimp showed the feed contains corn gluten and spirulina mixed with 50mg/kg of astaxanthin treatment had positive on a* (redness) value and difference as compared with commercial feed. The result of experiment 3 with red cherry shrimp showed the feed mixed with 50mg/kg of β-carotene, echinenone and astaxanthin treatment had the most highest on a* value and significant difference as compared with commercial feed. It suggested that don’t add canthaxanthin alone, it made the skin be orange . Diets contain astaxanthin affected the red on the skin. Mixing pigments had synergy to be higher a* value and reduce feed cost.
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