Fig. 7

Paraffin sections stained by haematoxylin and eosin (H&E) for histopathological examination of fish skin. (a) Large metacercarial cysts firmly attached to cutaneous structures (H&E, 40X magnification, arrows). (b) Metacercaria surrounded by a dense layer of connective tissue closely integrated into the host’s cutaneous connective tissue, with focal dispersion and host connective tissue edema (H&E, 200X magnification). (c) Activation of melanomacrophages in dermal tissue surrounding the cyst wall (H&E, 400X magnification)