Idiopathic lipomas occur sporadically and at low prevalence, and there is no indication of the cause of these benign neoplasms in wild or aquaculture fish. Lipomas have been reported in diverse species including dab (Bruno et al.,
1991), European eel (Easa et al., 1989a) and striped mullet (Mugil cephalus) (Easa et al., 1989b). Channel catfish with lipomas were found in two commercial fish ponds and from a research pond; none of these sites had any known carcinogenic contaminants (McCoy et al., 1985). In surveys of fish from polluted areas, no increase in prevalence of lipomas was found, but these neoplasms were more common in mature females and in certain geographic locations (Bruno et al., 1991).
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