Results SIMS δ 18 O otolith measurements An increasing trend was observed in the δ 18 O otolith chronological record during the early life and immature stages of all fish samples, with δ 18 O otolith values progressively enriched toward the first opaque zone ( Fig 4 ).
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Natal origin of Pacific bluefin tuna Thunnus orientalis determined by SIMS oxygen isotope analysis of otoliths.
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