Redescription of the parasitic copepod Pseudocaligus apodus and its effects on the gills of the flathead grey mullet, Mugil cephalus and testing two antiparasitic agents - Khidr, A.E.A., Abu Samak, O.A., Said, A.E. & Abou Hadied, M.M. (18th International Conference Egyptian German Society of Zoology‏, 2008)