Fig. 5
From: Histopathological evaluation of Wallago attu (Bloch & Schneider, 1801) infested by ectoparasites
a Infested gill showing secretions of mucus (SM), fusion of secondary gill lamella (FSGL), degeneration of primary gill lamella (DPGL), proliferated tips of secondary gill lamella (PTGSL). b Infested gill with curling of secondary gill lamella (CSGL), fusion of secondary gill lamella (FSGL), damaged central core (DCC), proliferated tips of secondary gill lamella (PTGSL). c Infested gill showing degeneration of central axis (DCA), secretion of mucus (SM), vacuole formation (VF), hyperplasia of epithelial cells (HE). d Infested gill showing necrosis of gill filaments (NGF)