MOBILITY OF TROPICAL TUNA AND THE
IMPLICATIONS FOR FISHERIES MANAGEMENT
(John Sibert, John Hampton)
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We apply an advection-diffusion reaction model to data from three
different tuna tagging experiments in the western and central Paci .c
Ocean (WCPO)to reexamine the question of to what extent the population
dynamics and spatial characteristics of tropical tunas require
international cooperation for effective management.The median lifetime
displacement of skipjack ranges from 420 to 470 nautical miles.The
lifetime displacement of yellowfin is about 20%less.The median
half-life,a measure of residence time,of skipjack and yellow .n in
WCPO exclusive economic zones (EEZs)is 3 .6 months.Fishingdecreases
the lifetime displacement and decreases the half-life.We conclude that
international arrangements between neighboring EEZs are essential for
effective conservation,but that Pacific Island countries can achieve
bene .ts from domestic conservation and .shery development policies.
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