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.
Several species live in association with siphonophores, which are colonies of tiny animals that resemble jellyfish. Examples include the Portuguese man o' war and the man-of-war fish (*Nomeus gronovii*), which consume their own tentacles and gonads as well as other jellyfish. Other driftfishes also associate with floating seaweed (*Sargassum*).