In the Amazon, a small tropical fish is serving as a canary in the coalmine for climate upheaval. Adalberto Luis Val, a Brazilian scientist, has dedicated his career to studying the tambaqui fish, which is native to the Amazon River basin. As a child, Val was fascinated by the fish and spent hours observing them in a jar after catching them in a lake near his home in rural São Paulo. However, his fascination turned to concern when he noticed that the fish were dying off at an alarming rate. Val's research has revealed that the tambaqui fish is highly sensitive to changes in water temperature and pH levels, making it an ideal indicator species for monitoring the health of the Amazon ecosystem. The fish's decline is a warning sign for the broader impacts of climate disruption on biodiversity and food security in the region. The Amazon is home to an estimated 2,000 fish species, many of which are found nowhere else in the world. The loss of even one species can have far-reaching consequences for the entire ecosystem. Val's research has significant implications for the conservation of the Amazon and the protection of its rich biodiversity. By studying the tambaqui fish, scientists can gain a better understanding of the impacts of climate change on the Amazon ecosystem and develop strategies to mitigate its effects. The Amazon is a critical component of the global ecosystem, producing 20% of the world's oxygen and absorbing 2.2 billion metric tons of carbon dioxide each year. The loss of the Amazon's biodiversity and ecosystem services would have devastating consequences for the planet. Val's work is a reminder of the urgent need for action to protect the Amazon and its inhabitants, including the tambaqui fish.