This study investigated the impact of the dietary supplementation of the water extract of algae Iyengaria stellata (IE) on the growth performance, fatty acid composition, antioxidant activity and disease resistance of shrimp Litopenaeus vannamei against Photobacterium damselae. A total number of 600 post larvae shrimp L. vannamei (mean 0.86 ± 0.01 g) were randomly divided into four groups (at three replications for each group). The control shrimp group (IE 0) was fed the basal diet free of supplemented IE. Other shrimp groups were fed the basal diet supplemented with IE at levels of 0.5 (IE 0.5), 1 (IE 1) and 1.5 (IE 1.5) g kg⁻¹ diet. Upon the completion of eight weeks of feeding, the challenge test was carried out on 30 shrimps from each experimental group with SK7 strain of P. damselae. After 8 weeks of feeding trail, the shrimp taking IE1 at 1 and 1.5 levels showed a significantly better WG, SGR, PER, FW and PUFA compared to those fed IE 0 and IE 0.5 diets. Adding of IE I to experimental diet, led to significant difference (P < 0.05) in the antioxidant activity. Shrimp fed an IE 1 containing diet, showed the highest PO, CAT, SOD and GP_X in comparison with other groups. In addition, incorporation of IE 1 supplemented diet at three doses, significantly reduced mortality percentage following challenging shrimp against P. damselae. The results indicate the positive effect of water extract from brown algae I. stellata at 1 g kg⁻¹ dose, on growth, PUFA and antioxidant activity of L. vannamei and also, showed a remarkable decrease in mortality after challenge with P. damselae.

本实验研究的水提取物的膳食补充的影响藻类Iyengaria斯泰拉塔（IE）的生长性能，脂肪酸组成，抗氧化活性和虾的抗病性凡纳滨对虾对发光菌damselae。幼体虾L总数为600只。南美白对虾（平均0.86±0.01克）随机分为四组（每组三重复）。对照虾组（IE 0）饲喂基础日粮，不含补充的IE。其他虾类群饲喂补充IE的基础日粮，其水平分别为0.5（IE 0.5），1（IE 1）和1.5（IE 1.5）g kg ^-1饮食。喂食八周后，对来自每个实验组的30只对虾（P. damselae）的SK7菌株进行了攻击试验。在喂食8周后，与以IE 0和IE 0.5饲喂的虾相比，以IE1和1.5摄入IE1的虾表现出明显更好的WG，SGR，PER，FW和PUFA。在实验饮食中添加IE I，导致 抗氧化活性显着差异（P <0.05）。饲喂含IE 1饮食的虾，与其他组相比，PO，CAT，SOD和GP _X最高。此外，以三种剂量掺入IE 1补充饮食，可显着降低虾对P. damsela攻击后的死亡率。e。结果表明，以1 g kg ^-1剂量的褐藻恒星藻水提取物对南美白对虾的生长，PUFA和抗氧化活性具有积极作用，并且在受到丹苏假单胞菌攻击后，死亡率显着降低。