An adult male black sea bream, Spondyliosoma cantharus with a tumour showing a plaque shape and partially covering the eye was examined. The surface was smooth and white-greyish in colour with localised haemorrhage. Histologically, the neoplasm was characterized by spindle cells with basophilic well defined cytoplasm. In some areas, neoplastic cells showed atypical pleomorphism. Some parasitic bodies were detected within the neoplastic tissue. The diagnosis of metastatic fibrosarcoma was made.