Abstract This study examined the effect of ethanolic extract of Jania adhaerens (JAE) as dietary supplement on growth performance, digestive (chymotrypsin, trypsin, protease, lipase and αAmylase) and antioxidant enzyme activities ((Phenoloxidase activity (PO), Superoxide dismutase (SOD), Glutathione peroxidase (GPX), catalase (CAT), and Malondialdehyde (MDA)), immune response and susceptibility of shrimp (Litopenaeus vannamei) to Photobacterium damselae infection. Four isonitrogenous diets containing 0.0, 0.5, 1.0, or 1.5 JAE g/kg were fed to shrimp (n = 600; mean = 1.24 ± 0.10 g) for 8 weeks. After feeding trial, 30 shrimps from each dietary treatment were infected with P. damselae (7.2 × 104CFU/mL) solution for 14 days. The results show that L. vannamei had better growth performance, antioxidant, and digestive enzyme activities than when fed control diet. The best growth, and antioxidant and immune response profiles were observed in shrimp fed diet containing 1.0 JAE g/kg. Also, shrimp fed 1.0 JAE g/kg diet had higher survival rate. These results revealed that inclusion of JAE at 1.0 g/kg doses improves growth, antioxidant activity, enhances the digestive enzymes and immunity of shrimp Litopenaeus vannamei fed with red seaweed Jania adhaerens against Photobacterium damselae infection.

中文翻译：

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用Jania adhaerens JV 补充日粮喂养的南美白对虾的生长性能、消化酶、抗氧化活性和免疫反应对抗光杆菌感染

和消化酶活性比喂食控制饮食时。在含有 1.0 JAE g/kg 的虾饲料中观察到最好的生长、抗氧化和免疫反应曲线。此外，饲喂 1.0 JAE g/kg 日粮的虾具有更高的存活率。这些结果表明，加入 1.0 g/kg 剂量的 JAE 可改善生长、抗氧化活性，增强用红海藻 Jania adhaerens 喂养的南美白对虾的消化酶和免疫力，以抵抗光杆菌感染。