Curved, single-piece shell fishhooks are found archaeologically in Oceania, Ecuador, southern Peru and northern Chile, and the Santa Barbara region of southern California. The hypothesis that fish were possible transpacific carriers of these shell fishhooks is examined in the light of recent tuna-tagging research. Tag release and recovery data show that three species of tuna are capable of undertaking long-range migrations. Skipjack tunas are known to migrate from Baja California to Hawaii. Some bluefin tunas have migrated from Baja California to Japan. Albacore, which is believed to consist of a single population in the northern Pacific Ocean, probably circumnavigates the Pacific. A migration model of the northern Pacific albacore population suggests at least one possible transportation route of shell fishhooks between Hawaii and the Santa Barbara region. Heyerdahl has postulated that the association at historic contact in the Santa Barbara region of the curved, single-piece shell fishhook, the frameless plank canoe, and the Polynesiantype cosmogony of the Chungichnish cult is evidence for pre-Columbian transpacific contact. Contrary to his theory, reasons are advanced here to suggest that these traits may instead be fortuitously associated rather than diffused as a complex. R ECENTLY there has been an enlivened interest in culture-element distributional studies as part of the controversy over Polynesian origins and particularly over the possibility that some of the eastern Polynesian islands could have been populated first by American Indians. Most of the evidence in favor of this theory has been presented by Heyerdahl (1952). As one of several traits, the extra-Oceanic archaeological occurrence of curved, single-piece shell fishhooks in the Santa Barbara region of California and on the coasts of Ecuador, southern Peru, and northern Chile indicates to Heyerdahl the likelihood of pre-Columbian transpacific contacts between Oceania and the western coast of the Americas. He cites the Santa Barbara occurrence as possible evidence of visits from Polynesia to the American mainland at the peak of the Maori-Polynesian navigation period in recent centuries (Heyerdahl 1952: 697-705). Even before Heyerdahl, the archaeological presence and association at historic contact of the curved, single-piece shell fishhook with the plank canoe in the maritime Chumash and Gabrielefio cultures of the Santa Barbara region led Kroeber (1939: 44) to suggest possible Oceanic influences in the development of these exceptional California cultures. Heyerdahl does not postulate any necessary historical connection between the Santa Barbaran and South American examples of the curved, single-piece shell fishhook. However, because of its absence in both Indonesia and continental Asia and its archaeological presence on the South American mainland, where its antiquity is presumed to be at least 1000 B.C., he theorizes that the curved, single-piece shell fishhook originated somewhere on the coast of South America before being diffused to Polynesia (Heyerdahl 1952: 698700). Notwithstanding the possibility of one or more centers of independent invention for this fishhook, the striking similarity in form between the widely separated occurrences of this type of hook, particularly between those of the Santa Barbara region and Oceania, strongly suggests diffusion as an explanation for at least part of its peculiar transpacific distribution. Apparently Heyerdahl assumes that the South American forms were earliest because of their simpler form and that the Santa Barbara examples, because of their close parallels with Oceanic forms, were derived from Polynesia. Whatever the history of their diffusion or development, the closest American parallels to the fishhooks of Oceania are those of the Santa Barbara region. Hooks similar to Santa Barbara types (Heizer 1949) are found in Murihiki and the Caroline Islands (Skinner 1942); also, elements in some forms of Hawaiian fishhooks (Emory and others 1959: P1. I) are similar to those of Santa Barbara types. Understandably, Heyerdahl emphasized planned migration of peoples or drifting of voyagers as the modes of diffusion of the curved, single-piece shell fishhook; however, there is an alternative to his interpretation which deserves closer consideration. In his discussion of the origin of the curved, single-piece shell fishhook in the Santa Barbara region, Heizer (1949: 92) suggested that the form might have been introduced there by a live fish bearing a fishhook. In an earlier paper (Heizer 1944: 397) he cited one case of a fish with a metal knife in its body to show that fish were capable of transporting foreign objects in their flesh. Although there is still no proof that fish are capable of transporting