A recent study published in Diversity and Distributions demonstrates the potential of environmental DNA (eDNA) in tracking fish migrations due to climate change. Researchers surveyed 2,000 kilometers of Australia's east coast, combining traditional visual surveys with eDNA analysis of seawater samples. The results revealed that eDNA detected tropical fish species in temperate ecosystems that had not been previously recorded, highlighting the limitations of visual surveys alone. This method provides a more comprehensive understanding of marine biodiversity shifts as species adapt to changing conditions. The findings underscore the importance of integrating eDNA techniques with traditional methods to better monitor and respond to the impacts of climate change on marine life.