TABLE 3.

Overview of gill lesions in the controls (no gill apoptosis)

Farm	No. of fish	Gill histopathology and agents visible on light microscopy
D	9	Moderate adherences of lamellae and parasitic flagellates (Ichthyobodo spp.)
E	4	Moderate detachment of lamellar epithelial cells
F	4	Moderately thickened lamellae due to epithelial hypertrophy
G	4	Severe epithelial proliferation
H	4	Moderate lifting of epithelial cells and fungal infection
I	3	Moderate epithelial hypertrophy
J	4	Severe epithelial proliferation
K	10	Focal detachment and necrosis of lamellar epithelial cells and bacteria colonizing the apical surface of epithelium
L	6	Moderate hypertrophy and necrosis of epithelial cells; mucous cell proliferation