A new study has pushed the known lifespan of the bigmouth buffalo to an estimated 148 years, making it one of the longest-lived freshwater fish ever documented. The female fish, found in Saskatchewan's Last Mountain Lake, likely hatched in 1876, meaning it swam through the Victorian era and into the modern age.
Researchers say the finding is remarkable not only for its age, but also for what it reveals about the species' biology. In a 2025 analysis, scientists used otoliths, the ear stones that record annual growth, to estimate age with multiple readers and validated methods. Earlier work had already shown that this North American fish can live well beyond a century.
Even more surprising, the species appears to show negligible senescence. A 2021 study found that older individuals did not show the typical signs of aging in the systems measured. Telomeres remained stable, while immune markers and stress indicators suggested that age does not necessarily bring decline in the same way it does for many animals.
That longevity may be essential for survival. In several watersheds, including Rice Lake in Minnesota and parts of Saskatchewan, researchers found that successful recruitment has been rare for decades. The fish continue to spawn, but few young survive into later seasons. Scientists suspect predation and shifting habitat conditions may be part of the reason.
This strategy, known as episodic recruitment, allows a long-lived species to wait for the right environmental window before a new generation takes hold. In that sense, time itself becomes a survival tool.
The bigmouth buffalo is native to North America, yet it has often been overlooked in management plans. New research is helping bring attention to its ecological value and unusual biology. As science continues to study these ancient fish, they may offer fresh clues about aging, resilience, and how long-lived species adapt to changing ecosystems. The future impact could reshape how we understand longevity in freshwater life.
