Switching from gillnets to longlines can help reduce the accidental catching of endangered franciscana dolphins in Argentina. By testing both fishing methods in the same areas, researchers found that longlines caught fewer juvenile fish and had less impact on dolphins, sea turtles, and sea lions. The economic analysis showed that this switch could be profitable for fishermen while helping protect the dolphins. This approach could lead to a more sustainable fishery and significantly decrease the harm to franciscana dolphins in the region.