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Radiochemical assays of fish otoliths using the radioisotope pair Pb-210/Ra-226 have proven successful in determining the longevity of several long-lived fish species, but are unsuitable for determining ages less than about 3 yr. We tested the utility of the radioisotope pair Th-228/Ra-228 for determining the longevity of the four-winged flyingfish Hirundjchthys affinis of the eastern Caribbean. A new decay equation was developed for interpreting radioactivity in whole otoliths characterized by a nonlinear growth history. Assay results on both whole otoliths and otolith cores indicated that the mean age of adult flyingfish was about 1 yr, and significantly less than 2 yr. The Th-228/Ra-228 radiochemical dating technique appears to be well suited for age determinations of fish up to age 5.

Radiochemical determination of longevity in flyingfish Hirundichthys affinis using Th-228/Ra-228