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Diseases of Aquatic Organisms

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DAO 68:219-226 (2006)  -  doi:10.3354/dao068219

Myxozoan pathogens in cultured Malaysian fishes. II. Myxozoan infections of redtail catfish Hemibagrus nemurus in freshwater cage cultures

K. Molnár1,*, C. Székely1, K. Mohamed2, F. Shaharom-Harrison2

1Veterinary Medical Research Institute, Hungarian Academy of Sciences, PO Box 18, 1581 Budapest, Hungary
2Kolej Universiti Sains & Teknologi Malaysia (KUSTEM), 2130 Kuala Terengganu, Terengganu, Malaysia

ABSTRACT: Cage-cultured Asian redtail catfish Hemibagrus nemurus (Valenciennes, 1840), a popular food fish in Southeast Asia, proved to be infected by 3 myxozoan species. All the 3 species belonged to the genus Henneguya: 2 were identified as H. mystusia Sarkar, 1985 and H. hemibagri Tchang et Ma, 1993, while the other was described as H. basifilamentalis sp. n. All plasmodia were found in the gills and were characterised by a specific site selection. H. mystusia formed plasmodia in the multi-layered epithelium between the gill lamellae and in the non-lamellar edge of the gill filaments, while H. hemibagri developed in the capillary network of the lamellae. H. basifilamentalis sp. n. had large oval plasmodia located deep among the filaments just above the gill arch.

KEY WORDS: Hemibagrus · Redtail catfish · Cage culture · Myxozoan infections · Henneguya · Site selection · Histology · Pathology

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