Mixed germ cell-stromal testicular neoplasia in a crucian carp (Carassius carassius L.): a case report.

This report documents a case of spontaneously occurring gonadal neoplasm in a crucian carp (Carassius carassius L.) caught in the wild. On the basis of the histopathological findings, the neoplasm was diagnosed as a mixed germ cell-stromal testicular neoplasia (gonadoblastoma).