How one aquarium fish is posing threat to an entire marine ecosystem (Ai generated image for reference)What began as colourful aquarium pets could now pose a threat to an entire freshwater ecosystem. Scientists are raising concerns after human-bred hybrid fish escaped into a lake in the Philippines, where they have established themselves in the wild, potentially putting native species and even human health at risk.The fish in question are flowerhorn cichlids, ornamental hybrids known for their vivid colours and distinctive bulging foreheads. As per the findings of the Ateneo de Manila University Department of Biology and the Ateneo Aquatic and Fisheries Resources Laboratory, the fish are believed to have escaped from breeding facilities into Lake Sampaloc, a volcanic crater lake in the Philippines, during a typhoon.Researchers now fear that the species has successfully integrated into the lake’s ecosystem, where it could disrupt the delicate balance of native aquatic life.Why are scientists worried?Unlike naturally occurring fish species, flowerhorn cichlids are human-created hybrids, selectively bred for the ornamental fish trade. Their striking appearance has made them popular among aquarium enthusiasts, but experts say they were never meant to survive in natural freshwater ecosystems. In many Asian cultures, flowerhorn fish is seen as a good luck charm (Image: Wikimedia Commons)Once released into the wild, invasive fish can compete with native species for food and habitat, prey on smaller organisms and alter the ecological balance of lakes and rivers. This is specially concerning as these fish tend to monopolize breeding grounds and feeding site. Scientists are concerned that the growing presence of flowerhorn cichlids in Lake Sampaloc could put pressure on the lake’s native biodiversity.Moreover, they are not affected much by the microplastic or pollutant content of the water bodies, thanks to their ” phenotypic plasticity.”Could they affect people too?Beyond their ecological impact, researchers are also investigating whether the fish may carry parasites capable of infecting humans. However, nothing concrete has been unveiled in this context yet.Story continues below this adWhile more studies are needed to understand the scale of the risk, the findings have added another layer of concern about introducing non-native species into natural environments.Experts have long warned that releasing aquarium pets into lakes, rivers or ponds—even with good intentions—can have unintended and far-reaching consequences. Once an invasive species becomes established, controlling or removing it can be extremely difficult.Also Read | Why invasive pufferfish are becoming a nightmare for Greek fishermenThe discovery has yet again highlighted the broader conservation issue of ornamental species escaping or being released into the wild.Around the world, invasive species are considered one of the leading drivers of biodiversity loss. Fish introduced outside their natural range can outcompete native wildlife, spread diseases and permanently alter ecosystems that evolved over thousands of years.Story continues below this adFor scientists studying Lake Sampaloc, the appearance of flowerhorn cichlids is a reminder that even seemingly harmless aquarium pets can become an environmental challenge when they find their way into the wild.Explore more captivating stories about pets and animals here, and make us your daily stop for the latest from the animal kingdom.