Abstract
Vertebrae are usually used to determine age and growth for sharks. Recent studies have shown that vertebrae contain impor- tant information about feeding and trophic level. In this study, vertebrae of blue shark ( Prionace glauca) were used to estimate stable isotope ratios ofδ 13 C andδ 15 N which were - 1. 664‰ ~- 1. 308‰, 9. 29‰ ~2. 237‰, and 2. 73~5. 73, respectively. The verte-
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