Fig. 4
From: Histopathological evaluation of Wallago attu (Bloch & Schneider, 1801) infested by ectoparasites
a Normal gill with inter lamellar spaces (ILS), secondary gill lamella (SGL), water channels (WC). b Infested gill with curling of secondary gill lamella (CSGL), fusion of secondary gill lamella (FSGL), damaged central core (DCC). c Infested gill with fusion of secondary gill lamella (FSGL), damaged central core (DCC) and aneurysm in secondary gill lamella (ANSGL). d Infested gill with hyperplasia (H)