Two Yangtze finless porpoises swam free in the river their species has called home for roughly 25 million years, after spending a full year in a rewilding "boot camp" designed to prepare captive-raised animals for life in the wild.

  • 2 finless porpoises released into the Yangtze River on October 24
  • 1 year of rewilding training completed before release
  • 3 months of post-release monitoring now underway
  • 25 million years: roughly how long the species has lived in the Yangtze, according to researchers

From tank to open river

The release took place in Hubei province, central China, and marks a new phase in the country's decades-long effort to save the Yangtze finless porpoise — the only freshwater cetacean left in China following the likely extinction of the baiji river dolphin. Much of China's porpoise conservation work to date has focused on breeding and monitoring animals inside protected lakes and semi-natural reserves. This release instead sent two animals directly back into a working stretch of the main river itself.

Before release, the pair worked through what amounts to wilderness survival school: learning to chase and catch live fish instead of accepting food from handlers, building stamina for river currents, and adjusting to natural light, noise and temperature instead of a controlled tank environment.

Decades of work behind two animals

China's captive-breeding program for the species is now in its fourth decade. The Institute of Hydrobiology at the Chinese Academy of Sciences has refined captive management and breeding techniques for 30 years and maintains a sperm bank with more than 200 samples to help safeguard the species' genetic diversity for future generations.

That long institutional effort is what made this particular release possible. Scientists needed confidence, built from years of captive-care data, that these two animals could actually survive outside a controlled setting before taking the risk of letting them go.

The trial release marks "a new step in China's ex-situ conservation efforts for the species," according to Reuters Connect coverage of the Hubei release.

Researchers will track both porpoises for the next three months using tagging and monitoring equipment, watching for feeding success, movement patterns and overall health. If the pair thrive, it could open the door to larger, repeated releases of captive-raised porpoises into additional stretches of river habitat.

Why a freshwater porpoise matters

The Yangtze finless porpoise is listed as critically endangered, with wild numbers once estimated as low as a few thousand after decades of shipping traffic, pollution and fishing pressure along the river. Its decline tracked closely with that of the baiji, the Yangtze river dolphin declared functionally extinct in the 2000s — a loss conservationists are determined not to repeat with the porpoise.

Government fishing bans along large stretches of the Yangtze, introduced in recent years, have already helped wild porpoise numbers stabilize in some sections of the river. Pairing that habitat protection with captive-bred animals re-entering the population gives biologists two separate tools working toward the same long-term goal: a self-sustaining wild population that no longer depends on tanks and training programs to survive.

For two porpoises in the Yangtze this week, the open river is no longer a distant memory passed down through their species. It's home again, and researchers will be watching closely to see if it stays that way.