One unidentified species of copepod belonging to the genus Caligus was found to infest the adult milkfish broodstock kept in canvas tanks at the SEAFDEC research station in Mag-aba, Pandan, Antique, Philippines. This report describes the morphology of the adult and early larval stages of this copepod. A highly effective method of control using the chemical Neguvon (2,2,2-trichloro-1-hydroxyl-phosphoric acid-dimethylethol) at a concentration of 0.25 ppm is recommended
