For decades, scientists believed <a href="https://www.mid-day.com/news/world-news/article/australia-shark-attack-man-killed-while-swimming-off-perth-beach-23650637" target="_blank" rel="none noopener">sharks were unique</a> among vertebrates lacking in cortisol, relying instead on a distinct hormone called 1a-hydroxycorticosterone.
However, a new study on North Pacific spiny dogfish shark (Squalus acanthias) has overturned this assumption.&nbsp;
Researchers discovered that under specific environmental stresses &mdash; such as recovering from low salinity levels &mdash; sharks <a href="https://www.mid-day.com/lifestyle/health-and-fitness/article/international-dog-day-2026-how-pets-lower-cortisol-faster-than-mindfulness-apps-23647156" target="_blank" rel="none noopener">produce cortisol</a>.&nbsp;
The hormone plays a crucial role in regulating glucose levels, offering groundbreaking insights into the evolution of vertebrate stress responses.
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A new study finds North Pacific spiny dogfish sharks can produce cortisol under environmental stress, challenging decades of beliefs about shark hormones

Sharks can produce cortisol under stress, new study challenges decades-old belief

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However, a new study on North Pacific spiny dogfish shark (Squalus acanthias) has overturned this assumption. 

Sharks produce cortisol to regulate glucose under stress, researchers discover

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