The Establishment and Application of Immune Indexes of Penaeid Shrimp

Shrimp lacks adaptive immune system. As for other invertebrates, innate immune mechanisms contribute to the shrimp defense reaction by limiting microbial invasions or by helping the clearance/killing of the invading microbes from the blood and tissues. They protect themselves against pathogens by the activities of phenoloxidase (PO), antimicrobial peptides, lectins, peroxidase (POD), hemolysin and so on. It was found by this experiment that the virus-resistant or microbe-challenged Penaeus japonicus hold higher activities of PO, POD and hemolysin. It's also found that after 6 hours of microbial challenge, the immune factors of the shrimp reached the highest activity. According to these data, the shrimp could be roughly judged whether they have high immune reaction or antiviral ability.