CHEN Jiazhang, Zang Xuele, MENG Shunlong, QU Jianhong, HU Gengdong, SONG Chao, FAN Limin, QIU Liping. Effect of nitrite nitrogen stress on the activities of nonspecific immune enzymes in serum of tilapia (GIFT Oreochromis niloticus)[J]. Ecology and Environment, 2012, 21(5): 897-901.