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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/26809

Title: The immunostimulatory effects of hot-water extract of Gelidium amansii via immersion, injection and dietary administrations on white shrimp Litopenaeus vannamei and its resistance against Vibrio alginolyticus
Authors: Yu-Win Fu;Wen-Ying Hou;Su-Tuen Yeh;Chiu-Hsia Li;Jiann-Chu Chen
Contributors: NTOU:Department of Aquaculture
國立臺灣海洋大學:水產養殖學系
Keywords: Litopenaeus vannamei;Vibrio alginolyticus;Hot-water extract of Gelidium amansii;Immersion;Injection;Diet;Immune parameter;Resistance
Date: 2007-06
Issue Date: 2011-10-21T02:18:48Z
Publisher: Fish & Shellfish Immunology
Abstract: Abstract:The total haemocyte count (THC), phenoloxidase activity, and respiratory burst were examined when white shrimp Litopenaeus vannamei were immersed in seawater (34‰) containing hot-water extract of red alga Gelidium amansii at 200, 400 and 600 mg l−1, injected with hot-water extract at 4 and 6 μg g−1 shrimp, and fed diets containing hot-water extract at 0, 0.5, 1.0 and 2.0 g kg−1. These parameters increased significantly when shrimp were immersed in seawater containing hot-water extract at 400 and 600 mg l−1 after 1 h, when shrimp were injected with hot-water extract at 6 μg g−1 shrimp after one day, and when shrimp were fed diets containing hot-water extract at 1.0 and 2.0 g kg−1 after 14 days. Phagocytic activity and clearance efficiency were significantly higher for the shrimp that were fed diets containing hot-water extract at 1.0 and 2.0 g kg−1 than those of shrimp that were fed diets containing hot-water extract at 0 and 0.5 g kg−1 after 14 and 28 days. In a separate experiment, L. vannamei which had received hot-water extract via injection, or fed diets containing hot-water extract, were challenged after 3 h or 28 days with V. alginolyticus at 2 × 106 cfu shrimp−1 and 1 × 106 cfu shrimp−1, respectively, and then placed in seawater. The survival of shrimp that were injected with hot-water extract at 6 μg g−1 was significantly higher than that of control shrimp after 1 day, and the survival of shrimp fed diets containing hot-water extract at 0.5, 1.0 and 2.0 g kg−1 increased significantly after 3 days as well as at the end of the experiment (6 days after the challenge), respectively. It was concluded that L. vannamei that were immersed in hot-water extract at 400 mg l−1, injected with hot-water extract at 6 μg g−1 shrimp, and fed hot-water extract of G. amansii at 2.0 g kg−1 or less showed increased immune ability as well as resistance to V. alginolyticus infection.
Relation: 22(6), pp.673-685
URI: http://ntour.ntou.edu.tw/handle/987654321/26809
Appears in Collections:[水產養殖學系] 期刊論文

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