DAO 29:237-240 (1997)  -  doi:10.3354/dao029237

Guanophoroma in the Red Sea silverside Atherinomorus lacunosus (Perciformes, Atherinidae)

Colorni A

The occurrence of a spontaneous tumor affecting the guanophore iridocytes of the Red Sea silverside Atherinomorus lacunosus is described. The tumoral mass consisted mainly of yellowish, light-reflecting guanine platelets. The tumor infiltrated the fibers of the underlying muscle tissue, growing in whorls around them. A delicate network of capillaries provided the tumor with a blood supply. No viral particles were observed. This rare form of tumor is the first of this kind reported in a feral fish from the Red Sea.


Guanophoroma · Neoplasia · Iridocyte · Guanine · Atherinidae · Red Sea


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