Hopeful Discovery: New Sanctuary for Rare Ganges Shark Found in Indonesian Rivers

Scientists have pierced the veil of mystery surrounding the Ganges River shark, confirming a viable population in North Kalimantan, Indonesia. This breakthrough offers renewed hope for the survival of this critically endangered species, whose natural habitats across Asia have suffered severe degradation over recent decades.

A Research Serendipity Reveals an Ecological Treasure

Michael Grant, a researcher from Australia's James Cook University, led a joint expedition with Indonesian universities to Borneo, where he met a local fisherman who accidentally caught seventeen sharks of this species in a single week. This staggering number exceeds the global count recorded over the past two decades, effectively confirming the presence of pristine habitats in an area previously excluded from the species' range. The team described this finding as a pivotal discovery, highlighting the survival of this elusive creature that thrives in low-salinity waters, away from its traditional strongholds in Pakistan, India, Bangladesh, Malaysia, and Myanmar.

Subsequent field studies indicated that the total number of discovered sharks rose to 42 individuals across two trips, although most evidence consisted of dried fins found in villages, posing methodological challenges for accurate population counts. Experts assert that this concentration in the Sesaiab River likely represents the last safe haven for the species globally, emphasizing the urgency of conservation efforts given the sharp decline in their numbers elsewhere.

A Background Threatened with Extinction

The Ganges shark is one of only three river shark species in the world and was listed as critically endangered by the International Union for Conservation of Nature's Red List, with an estimated population of only 240 adult sharks worldwide prior to this discovery. This new awareness led to the official designation of the Sesaiab River as an Important Shark and Ray Area in 2024, paving the way for intensive protection efforts. Local communities are increasingly aware of their role in caring for this unique creature, which does not pose a fishing wealth threat due to its unpalatable taste and commercially unattractive fins.