Freshwater Dolphin Conservation: Threats in River Ecosystems

River dolphins in Asia and South America are among the most endangered cetaceans, facing threats from habitat degradation, bycatch, and targeted killing. Their welfare and conservation are inseparable concerns.

Key Facts

Six species of freshwater dolphins exist globally, most critically endangered or vulnerable
The Yangtze River dolphin baiji was declared functionally extinct in 2006 after thorough surveys found none
The Ganges river dolphin is nearly blind relying entirely on echolocation to navigate turbid waters
Amazon river dolphins or botos face threats from hunting for use as fish bait in catfish lines
Indus river dolphins have been reduced to around 2,000 individuals in a fragmented river system
River dolphins are trapped in fishing nets and gillnets at alarming rates throughout their ranges
Dam construction fragments populations, blocks migration and degrades habitat quality
Pollution from agriculture, industry and human waste accumulates in river dolphin tissue

Welfare Considerations

River dolphins suffer acutely from entanglement in fishing gear, drowning in nets set across entire river widths. Dolphins in fragmented river systems experience the chronic stress of isolation from conspecifics and constrained ranges. Pollution accumulation causes immune dysfunction, reproductive failure and tumor development in chronically exposed individuals. The targeted killing of botos for fish bait involves transport and killing under stressful conditions. Dam construction causes rapid habitat loss, forcing dolphins into suboptimal areas with increased human conflict and reduced prey. These cumulative threats mean river dolphin welfare cannot be considered independently from the health of entire river ecosystems.

What You Can Do

Support WWF and Whale and Dolphin Conservation river dolphin programs
Advocate for better regulation of gillnet fishing in river dolphin habitats
Oppose dam construction in river dolphin strongholds without thorough impact assessments
Reduce pollution by choosing sustainably farmed produce and reducing chemical use
Support local community conservation programs in China, India and South America
Donate to organizations working on river dolphin rescue and rehabilitation