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Two Independent Cases of Spontaneously Occurring Branchioblastomas in Koi Carp (Cyprinus carpio)

Centre for Fish and Wildlife Health, Institute of Animal Pathology, Bern, Switzerland (RK, HS); Institute of Animal Pathology, Bern, Switzerland (KB); Tierklinik Obergrund AG, Luzern, Switzerland (RK); Fischcare, Stuttgart, Germany (SL)

Abstract

This report documents 2 cases of branchioblastomas in koi carp (Cyprinus carpio). Macroscopically, both cases were characterized by well-demarcated, pale red nodular masses located at the left first branchial arch and the right pseudobranch, respectively. Histologically, the neoplasias were composed of blast-like cells that differentiated into cartilage and branchial lamellae embedded in abundant fibrous connective tissue. Based on these findings, a branchioblastoma was diagnosed.

Key words: Branchioblastoma; gill; histopathology; koi carp (Cyprinus carpio); neoplasm.

Request reprints from Dr. Heike Schmidt-Posthaus, Centre for Fish and Wildlife Health, Institute of Animal Pathology, Länggassstrasse 122, PO Box 8466 CH-3001 Bern (Switzerland). E-mail: heike.schmidt{at}itpa.unibe.ch