The article examines the fragile life stage of glass eels, which are only a few centimeters long and live for about three years. They undergo a significant journey from the Sargasso Sea to the western European rivers, where they grow into adults. This long migration is fraught with challenges, including barriers like dams and turbines. The glass eels' vulnerable situation is exacerbated by their recognition as a delicacy in various regions, including the Basque Country, where they are traditionally served as a festive dish, raising questions about sustainability and conservation.

As glass eels continue their dangerous journey upstream to grow into mature eels, they face numerous obstacles that threaten their survival. Their popularity as a traditional food, especially in areas where they cost as much as 1400 euros per kilogram, reflects their commercialization and the impact of overfishing. The locals' affinity for this dish contrasts sharply with the growing awareness and urgency surrounding the importance of protecting this species and its habitat.

The discussion around the legality and ethics of consuming glass eels is becoming increasingly prominent as conservation groups advocate for stricter measures to protect these at-risk creatures. The plight of glass eels serves as a critical reminder of the balance that must be maintained between cultural traditions, culinary practices, and the pressing need to conserve endangered species in their natural environments.