From skin to conservation: new non-invasive tools to reveal the reproductive physiology and population dynamics of sharks
Project Leader
Developing a groundbreaking, minimally invasive endocrine tool to monitor the reproductive and physiological status of blue sharks in the Bay of Biscay.
Project Mission and Methodology
This project aims to develop and validate an endocrine tool based on the analysis of steroid hormones in blood and skin to infer the reproductive and physiological status of the blue shark (Prionace glauca), while exploring its potential as a minimally invasive method for monitoring shark populations.
The study will be conducted in the northern coast of Spain (i.e. Bay of Biscay), where blue sharks are regularly landed. The established collaboration and strong relationship with local fishermen provide a valuable opportunity to access freshly captured individuals and carry out biological sampling.
PROJECT LEADER
Maite Erauskin Extramiana
Growing up in San Sebastián on the Basque coast, I developed an early connection with the ocean that shaped my academic and professional path. I studied Marine Sciences in Vigo and completed a Master’s degree in Marine Ecology in Baja California, Mexico, where I gained valuable experience working with fisheries and coastal communities. I later earned a PhD in Spain on the impacts of climate change on commercially important pelagic species. Today, my research focuses on the ecology, conservation, and management of pelagic sharks, particularly vulnerable species such as blue sharks, shortfin makos, and porbeagles, with the aim of supporting sustainable fisheries and ocean conservation.
Conservation Impact and Future Applications
By validating the relationship between steroid hormone profiles and gonadal development, this project seeks to establish skin and blood hormone analysis as reliable indicators of sexual maturity and reproductive status in blue sharks, with the possibility to be extended to other pelagic sharks. Such an approach could significantly reduce the need for invasive reproductive assessments based on internal examination.
Project Gallery
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