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从对虾育苗池中任意收集活的虾苗，通过扫描电镜观察发现其体表有大量附生细菌和污着生物，优势菌为弧菌属。这些细菌可分解几丁质，损害甲壳表层并影响蜕皮，为其它生物附着创造了机会。当有病毒感染或其它因素使其抗病力下降时，此类细菌可能乘机进入虾苗繁殖，引发弧菌病，故可称之为条件致病菌。有体表细菌附生的虾苗，肝胰腺内也常发现细小病毒和大量细菌感染，造成肝组织坏死。这是虾苗停止变态、蜕皮和大量死亡的重要原因。
Shrimp nursery ponds from any random collection of live shrimp, by scanning electron microscopy showed that the body surface with a large number of epiphytic bacteria and fouling organisms, the dominant bacteria Vibrio. These bacteria break down chitin, damaging the carapace surface and affecting molting, creating an opportunity for other organisms to attach. When a virus infection or other factors make it less resistant to disease, such bacteria may take the opportunity to enter the shrimp breeding, causing vibriosis, it can be called opportunistic pathogens. Bacterial epiphytic surface shrimp, liver and pancreas are often found parvovirus and a large number of bacterial infections, resulting in liver necrosis. This is an important reason for shrimp to stop metamorphosis, molting and mass deaths.