In 1864, Tasmania imported brown trout for sport. 162 years later, it is building barriers to save a native fish reduced to just 6,000 individuals

For more than a hundred years, introduced brown trout have altered the freshwater ecosystems of Tasmania. In response, conservation teams are constructing artificial barriers to shield the native Swan galaxias fish. Their initiatives focus on maintaining viable populations, with new colonies sprouting in secluded, trout-free streams throughout eastern Tasmania to safeguard against potential disaster and disease.

Raccontata daeconomictimes.indiatimes.com