The isolated ectoparasite species: Crustacean species; (a) Caligus elongatus male, (b) Caligus species female (c) Learnanthropus kroyeri anterior end, (c1) Learnanthropus kroyeri posterior end, scale bar=0.4mm.(d) Livoneca redmani.(d1)Adult female. (d2) Juvenile stage, scale bar=0.7mm. Monogenean species; (e) Furnistinia echeneis. (f) Diclidophora merlangi, (g) Diplectanum aequanus, (h) Loxuroides spp. Scale bar=0.2 mm in a &c. Scale bar=0.5mm in b &d. Protozoan species : (Giemsa stain); (i) Trichodina truttae, scale bar=40 μm (b) Myxobolus tilapae stained spore, scale bar=20 μm. in a and b.