The Thai Journal of Veterinary Medicine


The aim of the present study was to determine the type of infection, species, the period and annual spatialprevalence, the effect of site, period and host size on prevalence of Henneguya infections in floating cages-raisedchannel catfish. Henneguya infections were detected in gills, fin adipose and skin, with mature spores measuring 58 to66 μm and 16 to 17 μm TL/BL. H. exilis was identified as the causing infection agent based on fresh cyst morphologyand spore measurements. In addition, mature spores measuring from 45 to 60 μm in TL and 14 to 19 μm in BL, wereobserved in the adipose tissue infections; H. adipose was identified as the infective agent in the adipose tissue, whereasthe skin infection may be related to H. sutherlandi. Histological changes showed the fusion and displacement of gilllamellae. In regard to Henneguya infections seasonal prevalence, it was shown that the highest (Maria Soto la Marinadam) and lowest (Soto la Marina River) prevalence were during the periods March-April and July-August.

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