DAO 95:203-208 (2011)  -  DOI: https://doi.org/10.3354/dao02354

Pathological changes in cultured channel catfish Ictalurus punctatus spontaneously infected with Streptococcus iniae

De-fang Chen1,2, Kai-yu Wang1,3,*, Yi Geng1,3, Jun Wang2, Xiao-li Huang2, Ming He1

1Department of Basic Veterinary, College of Veterinary Medicine, 2Department of Aquaculture, College of Animal Science & Technology, and
3Key Laboratory of Animal Disease and Human Health of Sichuan Province, Sichuan Agricultural University, Ya’an 625014, Sichuan, PR China
*Corresponding author. E-mail:

ABSTRACT: The pathological changes present in channel catfish Ictalurus punctatus spontaneously infected by Streptococcus iniae are described. The most consistent gross findings were marked petechial hemorrhages of the skin and congestion of internal organs, particularly the liver, spleen and kidneys. Other features included color fading at the edge of fin rays, enteritis and ascites. Histological examination showed oedema, degeneration and necrotic changes in many organs. Further, hepatitis, splenitis, interstitial nephritis, and meningitis with numerous monocyte and neutrocyte infiltrates were evident. Intact S. iniae cells were seen in macrophages. Apparently, spontaneous S. iniae infection caused acute septicaemia in channel catfish. This is the first histopathological report on channel catfish naturally infected with S. iniae.


KEY WORDS: Histopathology · Channel catfish · Streptococcus iniae


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Cite this article as: Chen DF, Wang KY, Geng Y, Wang J, Huang XL, He M (2011) Pathological changes in cultured channel catfish Ictalurus punctatus spontaneously infected with Streptococcus iniae. Dis Aquat Org 95:203-208. https://doi.org/10.3354/dao02354

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