Effect of γ-aminobutyric acid supplementation on growth performance, endocrine hormone and stress tolerance of juvenile Pacific white shrimp, Litopenaeus vannamei, fed low fishmeal diet

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• 作者：S.-W. Xie ; Y.-T. Li ; W.-W. Zhou ; L.-X. Tian ; Y.-M. Li ; S.-L. Zeng and Y.-J. Liu
• 刊名：Aquaculture Nutrition
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：23
• 期：1
• 页码：54-62
• 全文大小：1100K
• ISSN：1365-2095

文摘

An 8-week feeding trial was conducted to evaluate the optimum dietary γ-aminobutyric acid (GABA) level in low fishmeal diet for juvenile Pacific white shrimp, Litopenaeus vannamei. Six practical diets (449 g kg⁻¹ protein, 87 g kg⁻¹ lipid) supplemented with graded levels of GABA (0, 50, 100, 150, 200, 250 mg kg⁻¹) were formulated. Each diet was randomly assigned to triplicate groups of 30 shrimps (approximately 0.44 g), and the shrimps were fed four times a day to apparent satiation. Weight gain and gain rate were significantly increased with the supplementation of GABA (P < 0.05). Hepatosomatic index and survival were also significantly influenced by the dietary GABA levels (P < 0.05) and show a similar trend to those of growth performance. Insulin and neuropeptide Y concentrations in blood were increased with the supplementation of GABA. In total, 150 mg GABA kg⁻¹-supplemented diets significantly increased the survival after 12, 24 and 36 h of NH₃ stress, also increased the total antioxidant capacity, total superoxide dismutase, catalase, antihydroxyl radical and phenoloxidase activities before and after the 36 h NH₃ stress compared to basic group. These results clearly indicated that GABA could improve growth performance, antioxidative capacity and resistance against NH₃ stress in L. vannamei, and 150 mg kg⁻¹ GABA supplementation was suitable for L. vannamei fed with low fishmeal diet.