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Experimental transmission of Sphaerospora renicola to common carp Cyprinus carpio fry

Experimental transmission of Sphaerospora renicola to common carp Cyprinus carpio fry

Diseases of Aquatic Organisms 16(2): 91-95

The causative agent of renal sphaerosporosis and swimbladder inflammation was observed in specific-pathogen-free (SPF) carp Cyprinus carpio L. of the year following exposure to filtered water from a pond where Sphaerospora renicola Dykova et Lom, 1982 in enzootic. SPF carp showed infected kidney tubules after contact with water filtrates containing particles lt 45 mu-m in diameter. Using a Polymon filter the operative diameter of the causative agent could be determined as being lt 20 mu-m as shown by distinct S. renicola infections in SPF carp after exposure to 20 mu-m filtrate. Previous reports of a direct infection by contact with spore-releasing donor carp or feeding on spore-containing kidney tissue could not be confirmed. It is hypothesized that an actinospore component may be the causative agent of S. renicola infections in common carp.

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Accession: 002378368

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