With only 500 animals left, the Baltic harbor porpoises have been declared critically endangered. Being killed as bycatch in fishing nets is the major threat for the animals, yet fishing is still permitted, even in Marine Protected Areas. In Sea Shepherd’s Perkunas campaign, the crew of the M/V Emanuel Bronner documented and monitored deadly gillnets in protected areas of the Baltic Sea. But accidental death in fishing nets is not the only human-caused threat for these animals. Eutrophication, underwater noise, marine debris, overfishing, and bottom trawling are also damaging the Baltic Sea ecosystem, affecting both harbor porpoises and the local populations that depend on it. Commentary by Perkunas campaign leader, Reinhard Grabler.