the book also says " the obvious sign of infestation is an attached wormlike organism that can be seen on the portion of the fish's body. only the females of the copepods attached to the fish, so the worm is readily recognized by the presence of egg strings. since many species of copepods embed themselves deeply into the host by means of specialized mouthparts, a raised inflamed ring can be seen at the site of attachment. copepods are capable of causing severe damage to the host fish, especially when they attach to the gills. a typical simplified life cycle of a copepod involves the new development of the adult female parasite on the host, with development of the egg strings. these egg strings vary in appearance and can be straight, serpentine, or coiled.