Inter-Research > DAO > v139 > p113-119  
DAO
Diseases of Aquatic Organisms

via Mailchimp

DAO 139:113-119 (2020)  -  DOI: https://doi.org/10.3354/dao03479

Aeromonas spp. suggested as the causative agents of red spot disease in northern Vietnamese grass carp Ctenopharyngodon idella

Richard Mayrhofer1, Simon Menanteau-Ledouble1, Johannes Pucher2, Ulfert Focken3, Mansour El-Matbouli1,*

1Clinical Division of Fish Medicine, University of Veterinary Medicine, 1210 Vienna, Austria
2Department of Aquaculture Systems and Animal Nutrition in the Tropics and Subtropics, University of Hohenheim, 70593 Stuttgart, Germany
3Thünen Institute of Fisheries Ecology, 27572 Bremerhaven, Germany
*Corresponding author:

ABSTRACT: In northern Vietnam, a disease called ‘red spot disease’ has been causing high morbidity and mortality in populations of farmed grass carp Ctenopharyngodon idella for about 2 decades. The name ‘red spot disease’ refers to a condition characterised by haemorrhagic lesions, reddening and ulceration of the skin. Eight different bacterial isolates, namely Aeromonas hydrophila, A. sobria, Staphylococcus epidermidis, Vibrio alginolyticus, Pseudomonas fluorescens, P. luteola, Citrobacter freundii and P. putida, were isolated from diseased grass carp and used for experimental infection of the same species. Fish were challenged with the different bacterial isolates both by immersion and intramuscular injection. Different concentrations of bacteria were tested to evaluate their pathogenicity. Injection with 1 × 105 CFU of A. hydrophila and A. sobria resulted in clinical signs identical to those of red spot-diseased grass carp in Vietnam. None of the other bacterial isolates tested caused any morbidity or mortality in fish challenged either intramuscularly (1 × 106 CFU) or by bath immersion (1 × 106 or 1 × 108 CFU ml-1).


KEY WORDS: Aetiology · Clinical trial · Skin lesions · Vietnam


Full text in pdf format 
Cite this article as: Mayrhofer R, Menanteau-Ledouble S, Pucher J, Focken U, El-Matbouli M (2020) Aeromonas spp. suggested as the causative agents of red spot disease in northern Vietnamese grass carp Ctenopharyngodon idella. Dis Aquat Org 139:113-119. https://doi.org/10.3354/dao03479

Export citation
Mail this link - Contents Mailing Lists - RSS
Facebook - - linkedIn