OXYGEN AND CARBON-ISOTOPE VARIATION IN THE OTOLITHS OF BERYX SPLENDENS AND CORYPHAENOIDES PROFUNDICOLUS

Oxygen and carbon isotopes were measured by mass spectrometry from gas ified samples drilled out along the nucleus-to-dorsal growth axes of 1 1 sagittal otoliths of Beryx splendens and one otolith of Coryphaenoid es profundicolus. Oxygen and carbon isotope variability was high along the growth axes of the sagittal otoliths of both B. splendens and C. profundicolus, indicating heterogeneous thermal environments over the life of the fish in both species. The correlation between oxygen and c arbon isotope disequilibrium was low in B. splendens (r(2) = 19.3%) bu t higher in C. profundicolus (r(2) = 68.3%).