| Summary: | 碩士 === 國立臺灣海洋大學 === 水產養殖學系 === 101 === The extracts of two plants Yucca schidigera (YUPE) and Quillaja saponaria (QUPE) were assessed as dietary supplement for white shrimp (Litopenaeus vannamei) reared indoors in 18 72-L glass aquaria each with 15 shrimp for 156 days. Total supplement concentration was 0.5 % and set at five different YUPE:QUPE ratios at 100:00, 75:25, 50:50, 25:75, 00:100 and a control (no plant extract). All the shrimp in each aquarium were weighed weekly to determine the growth performance, while survival was daily recorded. For immune and antioxidant capacity, at the end of the experiment a random sample of twelve shrimp was taken from each treatment which later were divided in two groups. One group was subjected to stress by oxygen depletion, while the other remained as control. The results indicated that the use of YUPE and QUPE as plant extract additive in diet for Vannamei, ratios at 75:25, 50:50, 100:0, 25:75 enhanced significantly (p≦0.05) growth performance as compared to the control group. However, none of the shrimp, either plant extract groups or control showed significant difference in survival, water quality or immune. For antioxidant capacity, only aspartate aminotransferase of shrimp of 100:00 was significantly higher as compared with the other supplemental groups, except 00:100.
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