“What is a fish without a river?” Conservation Translocation of a Highly Threatened Cyprinid

ABSTRACT Conservation translocations are essential for reversing biodiversity loss. Here, we report a translocation initiative on the endangered Evrotas chub ( Squalius keadicus ) to re‐establish it in the Vassilopotamos River, within its historical range in Greece. Our approach combined feasibility assessments, invasive species control, demographic modelling and staged releases. Three years after the last release, the species persists, and individuals reach maturity; yet, reproduction remains undetected. Does that mean failure? Perhaps not, but persistence, while encouraging, is not enough. This effort highlights the promise and limitations of translocations and shows that long‐term monitoring and flexibility are critical for success.