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Sexual maturity in western Atlantic bluefin tuna
Gilad Heinisch1, Hanna Rosenfeld2, Jessica M Knapp1
11] Large Pelagics Research Center, University of Massachusetts Amherst, Gloucester, Massachusetts 01930, USA [2] University of New Hampshire, Durham, New Hampshire 03824, USA.
Abstract:
We introduce a novel endocrine approach for assessing the unresolved matter of the timing of sexual maturation in western Atlantic bluefin tuna (ABFT), a highly migratory population whose status remains uncertain. Ratios of follicle stimulating hormone to luteinizing hormone, a sexual maturity indicator, in all ABFT ≥ 134 cm curved fork length (CFL) were <0.4, similar to Mediterranean spawners, indicating that western ABFT mature at considerably smaller sizes and at a much younger age than currently assumed (≥ 185 cm CFL).
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