Outside of whaling, however, this speceis is still impacted by a number of threats. Interactions with fisheries have recently been in the spotlight with mature males depredating long-line gear in several locations around the world. In that Meditterranean, however, the main concern surrounds gillnet entangelments. Recent global surveys have shown that pollutants; such as PCBs, DDT, and heavy metals, can be found at high levels everywhere including more remote regions like the Antarctic. Sperm whales are also the focus of various whale watching operations worldwide, the impacts of which are still unclear. Lastly, but perhaps of most concern, ocean noise from sonar, global shipping, and seismic exploration for oil is increasingly garnering attention as a major conservation issue for many cetacean species.