This paper reports on a survey of 198 early career researchers from Spain, which aimed to assess their knowledge and attitudes towards predatory journals. The results revealed that the primary characteristic of predatory journals is their fast acceptance and publication times, while many other features are similar to legitimate journals. The study recommends several actions, including raising awareness and providing mentorship, promoting ethical publishing practices, and allocating resources to early career researchers by academic institutions. The findings highlight the need for better education and support for researchers in identifying and avoiding predatory journals. The study's conclusions have implications for policymakers, academic institutions, and individual researchers seeking to maintain the integrity of scholarly publishing.