A single fish caught in a reservoir in central Malaysia has raised concerns, according to reports from multiple news outlets. The suspect, a piranha, was caught in the Klau Dam reservoir in Pahang, about 100 kilometers northeast of Malaysia's capital, on August 26. This prompted the Department of Fisheries to open an investigation to determine if this non-native fish had been introduced into Malaysian waters. Authorities have rejected the hypothesis of a piranha colony being established around the dam, according to the Malay Mail. Adnan Hussain, director of the Department of Fisheries, stated that the public should not panic, as cited by the New Straits Times on September 17. The ministry will continue its monitoring to ensure that any new cases can be detected and that appropriate measures are taken. However, the next day, a second catch in the same area, slightly upstream, has worsened fears, according to the Straits Times. The images of the first piranha caught on August 26 quickly went viral, causing fears of attacks on children, prompting calls for greater control over exotic fish, and fueling the fear that a dangerous predator might spread through local waterways. Vanakkam Malaysia, a Tamil-language media outlet, posted a video about this second discovery on Facebook. Both fish were returned to the water. Experts have only photos and videos to work with. On the images, they resemble red-bellied piranhas, but they could also be red-bellied pacus, which are less dangerous. Both species are native to the Amazon. However, with just a single video, it cannot be confirmed whether it is actually a piranha or a pacu, according to Adnan Hussain, cited by The Star. Piranhas with their sharp teeth "have long been staples of horror films," recalls the Straits Times. "Now, in Pahang, this mystery leads residents to wonder if the Hollywood nightmare has become reality." However, for Intan Faraha A. Ghani, a lecturer at Universiti Selangor Malaysia, if the presence of piranhas was confirmed, "the first concern would be the ecological impact rather than a potential danger to humans." These fish "rarely live up to their Hollywood reputation" and, like sharks, they tend to avoid humans, who are not part of their food chain. The main threat would be to native fish. Until another specimen is caught and properly analyzed, the mystery of the Klau Dam piranhas will remain unsolved.