Renal sphaerosporosis in cultured grouper Epinephelus malabaricus

Abstract
In kidneys of diseased cage-cultured grouper Epinephelus malabaricus, a heavy infestation with myxosporean developing stages, belonging to a Sphaerospora spp., was proven using histological and electron-microscopical techniques. Kidney tubule lumens were heavily filled with mature spores and developing stages adhering to the brush border of the tubules. Renal corpuscles were also affected. No pathogenic bacteria or viruses were identified as causative agents of the disease. This is the report of sphaerosporosis in brackish water fish cultured in south-east Asia.

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