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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/33173

Title: An immersion of Gracilaria tenuistipitata extract improves the immunity and survival of white shrimp Litopenaeus vannamei challenged with white spot syndrome virus
Authors: Yong-Chin Lin;Su-Tuen Yeh;Chang-Che Li;Li-Li Chen;Ann-Chang Cheng;Jiann-Chu Chen
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: Litopenaeus vannamei;Gracilaria tenuistipitata extract;Immersion;White spot syndrome virus (WSSV);Immune parameters
Date: 2011-12
Issue Date: 2012-11-12T02:46:11Z
Publisher: Fish & Shellfish Immunology
Abstract: Abstract:The innate immunity and resistance against white spot syndrome virus (WSSV) in white shrimp Litopenaeus vannamei which received the Gracilaria tenuistipitata extract were examined. Shrimp immersed in seawater containing the extract at 0 (control), 400 and 600 mg L−1 for 3 h were challenged with WSSV at 2 × 104 copies shrimp−1. Shrimp not exposed to the extract and not received WSSV challenge served as unchallenged control. The survival rate of shrimp immersed in 400 mg L−1 or 600 mg L−1 extract was significantly higher than that of challenged control shrimp over 24–120 h. The haemocyte count, phenoloxidase activity, respiratory burst, superoxide dismutase activity, and lysozyme activity of shrimp immersed in 600 mg L−1 extract were significantly higher than those of unchallenged control shrimp at 6, 6, 6, 6, and 6–24 h post-challenge. In another experiment, shrimp which had received 3 h immersion of 0, 400, 600 mg L−1 extract were challenged with WSSV. The shrimp were then received a booster (3 h immersion in the same dose of the extract), and the immune parameters were examined at 12–120 h post-challenge. The immune parameters of shrimp immersed in 600 mg L−1 extract, and then received a booster at 9, 21, and 45 h were significantly higher than those of unchallenged control shrimp at 12–48 h post-challenge. In conclusion, shrimp which had received the extract exhibited protection against WSSV as evidenced by the higher survival rate and higher values of immune parameters. Shrimp which had received the extract and infected by WSSV showed improved immunity when they received a booster at 9, 21, and 45 h post-WSSV challenge. The extract treatment caused less decrease in PO activity, and showed better performance of lysozyme activity and antioxidant response in WSSV-infected shrimp.
Relation: 31(6), pp.1239–1246
URI: http://ntour.ntou.edu.tw/handle/987654321/33173
Appears in Collections:[海洋生物研究所] 期刊論文

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