Portuguese man o' war
Several species are found in association with siphonophores (which are colonies of tiny individual animals that have specialised functions which resemble jellyfish) such as the Portuguese man o' war; the man-of-war fish, "Nomeus gronovii", is known to eat its tentacles and gonads, as well as feeding on other jellyfishes. Other species of driftfishes are associated with the floating seaweed "Sargassum". The Cape fathead feeds mainly on salps. Some species of "Cubiceps" are occasionally caught on pelagic longlines set for swordfish.