Formosan Landlocked Salmon

The Formosan landlocked salmon (Oncorhynchus masou formosanus) is the world's southernmost salmonid population — a glacial relic stranded in Taiwan's mountains at the end of the last ice age, surviving today in just 5 kilometres of viable stream habitat within Shei-Pa National Park. Conservation investment has delivered dramatic results: the population fell to approximately 200 individuals after Typhoon Herb in 1998, then recovered to over 3,000 fish by 2023 through a NT$200 million habitat restoration programme. Survival depends on the Cijiawan River remaining below 17°C year-round — a thermal ceiling nearly 10°C stricter than the upper heat tolerance of other Oncorhynchus masou subspecies in Japan and Korea, making this population acutely sensitive to climate warming. Wuling Farm's purpose-built viewing platforms allow close observation without entering the stream channel. The most productive viewing months are October through February, when fish are most active near the surface.