Effects of supplemental Azomite in diets on growth,immune function and disease resistance of white shrimp (Litopenaeus vannamei) |
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| Authors: | X‐J Leng X‐G Su L Chen B Liu F Ma X‐Q Cai T Guo |
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| Institution: | 1. College of Fisheries and Life Science, Shanghai Ocean University, , Shanghai, China;2. Key laboratory of Freshwater Aquatic Genetic Resources, Ministry of Agriculture, , Shanghai, China |
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| Abstract: | This study was conducted to evaluate effects of dietary Azomite, a natural mineral of volcanic ash, on growth performance, digestive enzyme activities, serum non‐specific immunity and disease resistance of white shrimp (Litopenaeus vannamei). Graded levels of 0.0 g kg?1 (control group), 2.0, 4.0, 6.0 and 8.0 g kg?1 Azomite were supplemented in basal diet to feed shrimps. After 6 weeks feeding, weight gains of the 2.0 and 4.0 g kg?1 Azomite groups were significantly higher than that of the control group (P < 0.05). Compared with control group, the activities of stomach protease, hepatopancreas lipase, and serum alkaline phosphatase, lysozyme and phenoloxidase were significantly increased by the 4.0 g kg?1 Azomite addition (P < 0.05). When subjected to hypoxia stress, the lethal times of the first shrimp and all shrimps were both delayed by the addition of 2.0–6.0 g kg?1 Azomite to diets, compared with the lethal time of control group. At the 96th hour after the injection of bacterium (Vibrio alginolyticus), the accumulated mortality of 4.0 g kg?1 Azomite addition group was 34.6% lower than that of control group (P < 0.05). The results showed that dietary levels of 2.0 and 4.0 g kg?1 Azomite can improve the growth performance, digestive enzyme activities, serum non‐specific immune function and disease resistance of white shrimp. |
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| Keywords: | Azomite digestive enzymes disease resistance growth immune function
Litopenaeus vannamei
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