scienceChina

The Sturgeon's 3,000km Swim to Nowhere

Chinese sturgeon populations crashed 99%. Tagging studies revealed they still try to migrate 3,000km to spawn in rivers blocked by dams, dying in the attempt.

An Ancient Instinct Hits a Wall

The Chinese sturgeon, Acipenser sinensis, carries the genetic memory of 140 million years. This anadromous fish spends most of its adult life in the coastal waters of the East China Sea before instinct compels it on one of the most demanding reproductive migrations known. Historically, these fish swam up the Yangtze River and its tributaries, including the Minjiang River in Fujian, traveling as far as 3,300 kilometers inland to reach their spawning grounds. This migration is biologically necessary.

In 1981, this ancient cycle was abruptly broken. The construction of the Gezhouba Dam on the Yangtze, followed by the Three Gorges Dam in 2003, created impassable barriers. The dams physically blocked the sturgeons' path, cutting them off from their ancestral spawning sites. The population, which was estimated at over 10,000 spawning individuals in the 1970s, collapsed. By the early 2000s, fewer than 400 spawning adults were estimated to remain, a decline of over 97%. Tagging studies show a tragic reality: the sturgeon still attempt the migration, swimming hundreds of kilometers until they meet the concrete walls of the dams. The altered water temperatures and flows caused by the dams also inhibit gonadal development, rendering many of the surviving fish unable to reproduce successfully. For years, natural reproduction in the wild effectively ceased.

A Lifeline of Last Resort

With Acipenser sinensis extirpated from the Minjiang River and functionally extinct in much of its former range, the only hope for the species became human intervention. Chinese scientists embarked on a massive captive breeding and release program. The Chinese Sturgeon Research Institute, part of the China Three Gorges Corporation, is an important center for this effort. The initial work was challenging; early attempts required dissecting wild-caught females to harvest eggs, a method that was often lethal.

Over decades, researchers refined their techniques. By 2009, they achieved a major success: breeding a second generation of sturgeon entirely in captivity from captive-bred parents. This breakthrough meant that the few remaining wild individuals were no longer needed for the breeding program. Since the 1980s, millions of artificially bred Chinese sturgeon, from small fry to mature, 1.5-meter-long individuals, have been released into the Yangtze. Many of these larger fish are fitted with satellite and ultrasonic tags to track their movements, providing data on their attempts to adapt to the changed river system. While the species remains critically endangered, these releases are the only thing standing between this 140-million-year-old lineage and extinction.

💡Fun Facts

Sturgeons are often called "living fossils" as their physical form has remained largely unchanged since they co-existed with dinosaurs.
Instead of scales, a sturgeon's body is protected by five rows of bony plates called scutes.
Female Chinese sturgeon are slow to mature, only becoming ready to reproduce between 13 and 28 years of age.
Another sturgeon species, the Yangtze sturgeon (*Acipenser dabryanus*), was declared extinct in the wild in 2022, and now depends entirely on captive breeding and release for its survival.

References

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Practical Information

Opening Hours: The primary research and breeding facilities, like the Chinese Sturgeon Research Institute in Hubei, are not generally open for public tours. The recovery efforts are focused on habitat restoration and releases along the Yangtze and its tributaries, including sections of the Minjiang River within protected areas like Wuyishan National Park.
Admission: Not applicable. Observing the river habitat within public parks is generally free or requires a park entrance fee.
Accessibility: Terrain varies. Access points to the Minjiang River in parks or nature reserves may involve uneven paths and natural landscapes.

The Minjiang River Sturgeon RecoveryFujian, China

The Sturgeon's 3,000km Swim to Nowhere

Chinese sturgeon populations crashed 99%. Tagging studies revealed they still try to migrate 3,000km to spawn in rivers blocked by dams, dying in the attempt.

An Ancient Instinct Hits a Wall

A Lifeline of Last Resort

💡Fun Facts

Sturgeons are often called "living fossils" as their physical form has remained largely unchanged since they co-existed with dinosaurs.
Instead of scales, a sturgeon's body is protected by five rows of bony plates called scutes.
Female Chinese sturgeon are slow to mature, only becoming ready to reproduce between 13 and 28 years of age.
Another sturgeon species, the Yangtze sturgeon (*Acipenser dabryanus*), was declared extinct in the wild in 2022, and now depends entirely on captive breeding and release for its survival.

References

There's more in the app

3000+ curious places on an interactive world map, free on Android.

Read offline — articles and maps work without a connection
Save places and build trip collections
Daily discovery — one fascinating place a day

Get it on Google Play

Practical Information

Opening Hours: The primary research and breeding facilities, like the Chinese Sturgeon Research Institute in Hubei, are not generally open for public tours. The recovery efforts are focused on habitat restoration and releases along the Yangtze and its tributaries, including sections of the Minjiang River within protected areas like Wuyishan National Park.
Admission: Not applicable. Observing the river habitat within public parks is generally free or requires a park entrance fee.
Accessibility: Terrain varies. Access points to the Minjiang River in parks or nature reserves may involve uneven paths and natural landscapes.

The Minjiang River Sturgeon RecoveryFujian, China

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