Branchiomycosis (Gill Rot Disease)

- Introduction

 Branchiomycosis is globally distributed in regions where summer water temperatures are above 20°C. In Egypt, Branchiomyces spp. was isolated from naturally infected Nile tilapia with a prevalence of 92% from cultured fish in Edco farms and revealed high mortality (Khalil et al., 2015, Mahboub and Shaheen, 2021). Branchiomycosis most causes respiratory manifestations, lethargy, and high mortalities (Sen and Mandal, 2018). Gills necrosis of infected fish renders the fish to be susceptible to predation and other infections from opportunistic pathogens and mortality.