Myc montefiorense was recovered sporadically from granulomatous skin lesions in

Myc montefiorense was recovered sporadically from

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Myc. montefiorense was recovered sporadically from granulomatous skin lesions in captive moray eels in the U.S.A. (Levi et al., 2003). Myc. neoaurum has been associated with ocular lesions (oedema, exophthalmia) in Atlantic salmon (Bachman et al., 1990). Nodules may form in the muscle, where they are visible on the outside of the fish. These nodules may burst, releasing bacteria into the aquatic environment. Internally, nodules may develop on the organs, leading to emaciation, or oedema or peritonitis may ensue. Infection may spread to the skeleton, in which case deformities become apparent. Death will ultimately occur (Van Duijn, 1981). Myc. pseudoshottsii was recovered from an epizootic of mycobacteriosis in striped bass from Chesapeake Bay, Virginia (Rhodes et al., 2005). Myc. shottsii was described as the cause of an epizootic in striped bass from Chesapeake Bay. Infected fish had granulomatous lesions in the kidney and spleen, and in the skin (Rhodes et ai, 2003).
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22 Bacterial Fish Pathogens Myc. gordonae was recovered from guppy (Poecilia reticulata) in Thailand notably during rainy and/or cold periods. The fish, which experienced substantial mortalities, displayed inappetence, sluggish swimming behaviour, fin erosion, skin ulceration and the presence of systemic granulomas (Sakai et ai, 2005). A range of mycobacteria was recovered from various aquarium fish in Slovenia, and based on molecular methods included Myc. chelonae, Myc. fortuitum, Myc. gordonae, Myc. marinum, Myc. peregrinum and Mycobacterium spp. Of these Myc. gordonae and Myc. peregrinum are new to fish pathology (Pate et al., 2005). Unfor- tunately, the authors did not address the pathogenicity of the isolates. Similarly, Rhodes et al. (2004) recovered a range of mycobacteria from striped bass in Chesapeake Bay, Virginia, and based on phenotypic traits included Myc. interjectum, Myc. marinum, Myc. scrofulaceum, Myc. shottsii, Myc. szulgai and Myc. triplex (Rhodes et al., 2004b). Again, some of these taxa are new to fish pathology, and deserve further study. The message about the diversity of mycobacteria in Chesa- peake Bay fish was reinforced by work with Atlantic menhaden (Brevoortia tyrannus), which led to the recovery o^ Mycobacterium spp., from ulcers, and Myc. fortuitum, Myc. gordonae and Myc. marinum from spleen (Stine et al., 2005). In their excellent review, Kaattari et al. (2006) discuss all the currently recognised mycobacterial fish pathogens, including the new but not formally named species, Myc. "chesapeaki". Nocardiaceae representatives Nocardia spp. It is appreciated that nocardiosis may be problematical in freshwater (Valdez and Conroy, 1963; Conroy, 1964; Snieszko et al, 1964b; Heuschmann-Brunner, 1965a; Campbell and MacKelvie, 1968; Ghittino and Penna, 1968) and marine fish (Wood and Ordal, 1958), occurring in a range of fish species, including Atlantic salmon (Bransden et al., 2000). Symptoms similar to mycobacteriosis develop in affected fish.
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  • Bacteria, representative, gram-negative bacteria

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