Infection of barramundi Lates calcarifer with Streptococcus iniae: effects of differentroutes of exposure

Diseases of Aquatic Organisms

E. S. Bromage¹  L. Owens¹ 

关键词: Barramundi;    Streptococcus iniae;    Route of infection;   

DOI  :  10.3354/dao052199

学科分类：生物科学（综合）

来源: Inter-Research

【 摘 要 】

ABSTRACT: The use of various challenge techniques has allowed the formation of a hypothesis for the mode of infection of Streptococcus iniae in barramundi. A bacterial dose of 1 x 10³ colony forming units (cfu), corresponding to theLD₅₀, delivered orally to barramundi could initiate the sub-acute form of the disease observed at the farms. The acute form of the disease could be initiated through bath exposure to the pathogen. S. iniae was equally as infective infreshwater, saltwater or when fish were subject to skin trauma prior to exposure, with LD₅₀ values of 3.2 x 10⁴, 2.0x 10⁴, 3.2 x 10⁴ cfu, respectively, when observed over a 10 d period. It is suggested thatsub-acute infection occurs orally, with mass mortalities occurring through the increased presence of the bacterium in the environment.

【 授权许可】

Unknown