Nature Conservation (2026). DOI: 10.3897/natureconservation.63.183768"> a. Future Oceans pinger—both types (10 and 70 kHz) have the same shape and mass, with the only difference being the frequency of the signal; b. PAL Wideband pinger. Credit: Nature Conservation (2026). DOI: 10.3897/natureconservation.63.183768 The endangered Black Sea harbor porpoise (Phocoena phocoena relicta) is facing a critical fight for survival. As Europe's smallest marine mammal, this isolated population is being pushed toward extinction by bycatch—the unintentional entanglement in fishing gear. The crisis is most acute in the Black Sea turbot fishery, where recent estimates reveal that more than 10,000 porpoises die annually. Led by a strong motivation to address threats to this iconic species, a team of Bulgarian researchers has carried out a four-year trial study of 57 hauls seeking effective solutions to reduce porpoise mortality.…