Retrobulbar gangliocytoma and carcinoma of the corpuscles of Stannius in a pearl gourami, Trichopodus leerii (Bleeker, 1852)

Abstract

Gourami are freshwater anabantiform labyrinth fishes of the Family Osphronemidae (gourami and fighting fishes) characterized by a vascularized suprabranchial labyrinth organ that allows for facultative air breathing. Native to Asia, several of the 136 gourami species are popular in the global ornamental fish trade (Nelson, Grande, & Wilson, 2016). Vulnerable to many pathogens of freshwater fish, gourami are particularly known for their susceptibility to infection with and ability to transmit iridoviruses (Go, Lancaster,