Infiltrative Tubular Carcinoma in a Common Clownfish, Amphiprion ocellaris

Neoplasia affecting a variety of tissues has been documented in many fish species. However, there are few reports of neoplasia in the common clownfish, Amphiprion ocellaris . An adult female clownfish in a public display aquarium was diagnosed with a locally invasive tubular carcinoma. The tumour was characterised by well-differentiated tubules supported by moderate amounts of pale eosinophilic stroma that infiltrated the skin, skeletal muscle and fascial planes of the vertebrae. This is the first report of a tubular carcinoma in this species.