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Morphology and distribution of granulomatous inflammation in freshwater ornamental fish infected with mycobacteria
Author(s) -
Novotny L,
Halouzka R,
Matlova L,
Vavra O,
Bartosova L,
Slany M,
Pavlik I
Publication year - 2010
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.2010.01202.x
Subject(s) - biology , ornamental plant , fish <actinopterygii> , morphology (biology) , freshwater fish , granulomatous inflammation , inflammation , zoology , microbiology and biotechnology , pathology , fishery , ecology , immunology , medicine
Mycobacteriosis in fish is a chronic progressive ubiquitous disease caused by Mycobacterium marinum, M. gordonae and M. fortuitum in most cases. The aim of this study was to describe the morphology and distribution of lesions in 322 freshwater ornamental fish across 36 species. Granulomatous inflammation was diagnosed by gross examination and histopathology testing in 188 fish (58.4%); acid‐fast rods (AFR) were determined in only 96 (51.1%) fish from 19 species after Ziehl–Neelsen staining. The most often affected organs with AFR were the kidney (81.2%), digestive tract (54.1%), liver (48.2%), spleen (45.9%) and skin (21.2%); sporadically, AFR were found in the branchiae (9.4%) and gonads (4.7%). In 14 randomly selected fish originating from four different fish tanks, the distribution of mycobacterial infection was studied by culture examination of the skin, gills, muscle tissue, digestive tract, liver, spleen and kidney. In 12 fish, the species M. marinum , M. gordonae , M. fortuitum , M. triviale , and M. avium subsp. hominissuis (serotypes 6 and 8 and genotype IS 901− and IS 1245+ ) were detected; mixed infection caused by different mycobacterial species was documented in five of them.