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. 2019 Dec 13;102(4):876–887. doi: 10.1093/biolre/ioz221

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© The Author(s) 2019. Published by Oxford University Press on behalf of Society for the Study of Reproduction.

This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)

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Testosterone concentration (estimated marginal mean and 95% confidence interval) for in situ and aquarium sharks during spring (breeding season) and summer (nonbreeding season). In situ shark testosterone concentration was highest during spring and decreased to baseline levels in summer. Aquarium shark testosterone concentration was not different between seasons. In situ sharks had higher testosterone concentration than aquarium sharks during the breeding season. Different letters indicate significant (P < 0.05) differences among the groups.