Effects of L-arginine on the humoral immuning factors of Litopenaeus vannamei
L-精氨酸对凡纳滨对虾体液免疫因子的影响

The American white shrimp Litopenaeus vannam of the body length 6.8~8.5 cm was collected from a culture farm in Zhanjiang.One control group(raw diets) and three levels of L-arginine(L-arg) groups were designed.The levels of L-arginine added in the raw diets were 1.5%,1% and 0.5%,respectively.The period was 4 weeks.Humoral immuning factors such as NOS,NO,ACP,AKP and SOD,as well as the sensitivity of the shrimp to Vibrio parahaemolyticus were investigated.The results showed that L-arginine at doses from 0.5% ...