Yangtze Finless Porpoise Numbers Rise, but China's Rescue Effort Faces Lasting Threats

A Rare Recovery in the Yangtze

The Yangtze finless porpoise population rose from 1,012 in 2017 to 1,249 in 2022, an increase of more than 23% and the first recorded rise since monitoring began. For China's last surviving river cetacean, the improvement offers hope after decades of decline. Keeping that recovery going will require protection across a river system under constant pressure from fishing, shipping, pollution and construction.

The Yangtze supports the lives of more than 400 million people, flowing past busy cities and fertile farmland. Beneath its surface, roughly 1,200 wild porpoises remain. Their survival depends on whether the river can provide enough fish, suitable habitat and water conditions for them to feed and reproduce.

The intelligent, playful mammal, known for an expression resembling a permanent smile, once shared these waters with the now extinct baiji dolphin and the paddlefish. The porpoise is now the Yangtze's last surviving cetacean, the group of mammals that includes dolphins, porpoises and whales.

China's response combines a fishing ban, protected areas, breeding programmes, legal protection and help from communities along the river. The increase recorded in 2022 suggests that recovery is possible, although the species remains critically endangered.

How the Population Fell

The Yangtze finless porpoise, known scientifically as Neophocaena asiaeorientalis asiaeorientalis, is the world's only freshwater porpoise. It lives exclusively in China's Yangtze River and the connected Poyang and Dongting lakes. Protecting this river and lake system therefore means protecting the species' entire natural home.

An estimated 3,600 porpoises lived there in the early 1990s. By 2017, the population had fallen to just over 1,000. The International Union for Conservation of Nature classified it as critically endangered in 2013, reflecting the severity of its decline.

Overfishing removed much of the food the porpoises needed. Industrial waste, agricultural runoff and untreated sewage damaged water quality, affecting both the mammals and their prey. The loss of food echoed one of the pressures that had threatened the baiji dolphin.

Dam construction, especially the Three Gorges Dam, changed river flows and blocked migration routes for many aquatic species. Habitat loss and fragmentation reduced the continuity of the river environment. Fragmentation means that suitable places to live become separated, making it harder for animals to move between them.

The Yangtze is also a major transport route. Noise from ships disrupts echolocation, the process through which porpoises use sound and returning echoes to navigate and find fish. Underwater noise may also have contributed to the baiji's extinction.

Illegal fishing adds a direct danger. Abandoned fishing lines and gillnets, which catch fish by their gills, can injure or kill porpoises. The species reproduces slowly, making it difficult to replace animals lost to these threats in a densely populated and economically vital river basin.

A Decade of Fishing Restrictions

China introduced a complete fishing ban along the Yangtze and its major tributaries in 2021. Set initially for 10 years, the policy is enforced by police and carries stiff penalties. It is one of the largest changes affecting the river's wildlife and the communities that depended on fishing.

The ban put 220,000 fishermen out of work. It has also brought a dramatic rebound in fish populations, helping restore the food supply for porpoises and other wildlife. For an animal that must find enough fish to survive and raise young, that change addresses a basic need.

The population increase from 2017 to 2022 amounted to 237 porpoises. The survey period includes years before the 2021 ban, while the wider conservation effort also includes reserves, breeding and habitat protection. Together, these measures form the response to the species' decline.

Scientists and conservationists hope the fishing ban will continue beyond its initial decade because fish stocks and porpoise populations remain fragile. Recovery requires enough fish to remain in the water year after year, alongside protection from other dangers.

The main milestones show how the response developed:

• Early 1990s: The porpoise population was estimated at 3,600.
• 2005: Tao Tao became the first Yangtze finless porpoise born in an artificial environment.
• 2013: The IUCN classified the species as critically endangered.
• 2016-2025: China's Yangtze River Porpoise Rescue Action Plan set out a programme for conservation.
• 2017: The population stood at 1,012.
• 2021: China introduced the fishing ban and upgraded the porpoise to its highest level of legal protection.
• 2022: The population reached 1,249, the first recorded increase since monitoring began.

Reserves Need to Match the Animals' Habitat

China has established eight in situ reserves and three ex situ conservation areas for the porpoise. In situ protection safeguards animals within their natural habitat. Ex situ conservation uses places outside that original setting, including semi natural refuges and breeding centres.

These areas aim to protect important habitat, reduce disturbance from people and provide safer places for feeding and breeding. Together, they give conservation teams several ways to protect animals, from managing stretches of river to maintaining populations in more controlled conditions.

Some reserves, however, have recorded faster population declines than unprotected areas. Research has linked poor outcomes in certain protected areas to weak management or insufficient enforcement. A boundary on a map needs patrols, resources and suitable habitat within it to help the animals living there.

Some reserves were originally created for the baiji dolphin. Their boundaries do not always match the places finless porpoises now use, leaving important habitat outside protected zones.

Experts recommend redrawing boundaries around current porpoise movements, increasing resources for patrols and involving nearby communities. They also advocate flexible conservation zones and management that changes as new information becomes available. Local knowledge can help identify where animals feed, travel and gather.

Breeding Porpoises and Returning Them to the River

At the Baiji Dolphin Hall in Wuhan, researchers have bred several generations of Yangtze finless porpoises in captivity. Tao Tao, born in 2005, was the first of the species born in an artificial environment and remains the best known example of that work.

The breeding programme has increased the captive population while helping researchers understand porpoise health, behaviour and daily care. Such knowledge matters when conservation teams must look after animals outside the river or prepare them for a different environment.

Chinese biologists have also rescued, rehabilitated and reintroduced two male porpoises bred in captivity. Before their release into the Yangtze, the animals spent time adjusting in a semi natural waterway.

The two males joined wild groups and thrived for at least three years after release. Their experience represents a rare success in returning cetaceans to the wild and offers hope that similar work could help increase the river population.

Reintroduction may also help maintain genetic diversity, the variety of inherited traits within a population. Keeping that variety is part of conserving small populations, alongside increasing their numbers. Breeding programmes and river protection therefore serve related purposes within the rescue effort.

Former Fishermen Become River Guardians

Communities along the Yangtze have become part of the conservation response. Many former fishermen now work as river guards and porpoise observers, helping enforce fishing restrictions and monitor where the animals appear.

The change gives some people whose fishing livelihoods ended a new role in protecting the river. Their experience on the water also makes local participation valuable when conservation teams monitor activity across a large and busy river system.

Public campaigns, including "Keep the Finless Porpoise Smiling," have built support and educated millions about the species' situation. The aim is to turn public affection for the animal into sustained interest in its survival.

Lenovo and the Wuhan Baiji Dolphin Conservation Foundation have launched the world's first Yangtze finless porpoise tracking map and viewing guide. The initiative uses artificial intelligence to analyse porpoise movements and identify suitable observation points.

The project also seeks to involve people in citizen science and ecotourism. Citizen science means public participation in gathering information that can support research. Combined with monitoring by river guards and scientists, these activities widen participation in the conservation effort.

Why the Recovery Is Still Fragile

Illegal fishing continues despite the ban. Enforcement is especially difficult in remote places and reserves with weak management, while abandoned lines and nets remain a danger to porpoises.

Dams and water diversion projects continue to change river flows and disrupt routes used by aquatic species. As habitats become separated, porpoise groups can become isolated from one another, reducing opportunities to maintain genetic diversity.

Water quality has improved in many areas, but industrial and agricultural runoff still threatens the river, particularly in regions developing rapidly. Shipping is unlikely to decrease, leaving underwater noise as a continuing obstacle to porpoise communication, navigation and hunting.

Climate change adds pressure through altered rainfall patterns and extreme weather. These changes can place further stress on the river ecosystem and the animals that depend on it.

Demographic models have projected that, without continued and stronger intervention, the porpoise could disappear from the wild in as little as 25 to 33 years. These models calculate how a population might change through births, deaths and other conditions. The projection describes the danger of insufficient protection rather than a fixed date for extinction.

Scientists warn that the window for effective conservation is narrow. Maintaining the recent increase will require action on food supplies, habitat, fishing practices, pollution and noise at the same time.

Mapping Where Protection Is Needed

Researchers are using Random Forest based Species Distribution Models to map porpoise habitat preferences and predict where the animals are likely to occur. These computer models examine patterns in environmental information to identify conditions associated with porpoise presence.

The studies show that habitat use changes with the seasons. Cyanobacteria levels and total phosphates are among the factors associated with those patterns because they affect conditions for the fish porpoises eat. Cyanobacteria are microorganisms found in water, while phosphates are nutrients that influence aquatic growth.

Environmental DNA and machine learning are also helping refine conservation strategies. Environmental DNA is genetic material animals leave in their surroundings. Machine learning allows computer systems to identify patterns in data, helping researchers target protection where it is most needed.

Surveys in the Jingjiang section of the Yangtze have found more porpoises than expected in a previously overlooked area. The finding supports expanding research into places where information is limited, rather than concentrating only on familiar conservation sites.

Seasonal maps and wider surveys can help managers decide where reserve boundaries, patrols and other protective measures should change. They give practical information for the flexible management recommended for the river.

Law, Science and Lessons Beyond China

China upgraded the Yangtze finless porpoise to its highest level of legal protection in 2021. The change increases penalties for harming the species, raises public awareness and directs more resources towards conservation.

The Yangtze River Porpoise Rescue Action Plan (2016-2025) and the Yangtze River Protection Law provide a legal framework for the work. Alongside the fishing ban, they connect species protection with the management of the wider river.

China's approach brings together protection in natural habitats, conservation outside them, strict legal safeguards, community participation and new technology. The "One Plan Approach" connects policy, science, education and public involvement rather than treating them as separate tasks.

Delegations from Southeast Asia have visited Chinese reserves to learn from these efforts, hoping to apply similar methods to threatened river dolphins such as the Irrawaddy dolphin. The fishing ban, in particular, is viewed as a possible model for restoring wildlife in heavily exploited rivers elsewhere.

Acoustic monitoring in real time, tracking supported by artificial intelligence and public viewing guides are also becoming part of river cetacean conservation. Their value lies in linking information about the animals with decisions about how to protect them.

What the Porpoise Says About the River

The Yangtze finless porpoise depends on clean water, plentiful fish and a balanced ecosystem. Those same conditions benefit other wildlife and the millions of people whose lives depend on the river.

Mei Zhigang, a researcher at the Institute of Hydrobiology, describes the animal's population as a measure of the river's condition:

The population status of the Yangtze finless porpoise serves as a barometer of the ecological environment of the Yangtze River.

A sustained recovery would signal wider improvement for a river that also supports migratory birds, rare fish and aquatic plants. The porpoise provides a visible focus for work whose benefits extend far beyond one species.

The increase to 1,249 animals gives China a rare opportunity to build on a recorded recovery. Protecting that gain now depends on keeping fish stocks healthy, managing reserves effectively and reducing the dangers that remain throughout the Yangtze and its connected lakes.

Key Points

• The Yangtze finless porpoise is the world's only freshwater porpoise and remains critically endangered.
• The population rose from 1,012 in 2017 to 1,249 in 2022, an increase of more than 23%.
• A fishing ban introduced in 2021, protected areas, breeding programmes and community participation support the rescue effort.
• Illegal fishing, pollution, fragmented habitat, shipping noise and climate change continue to threaten recovery.
• Researchers are using habitat models, environmental DNA and wider surveys to improve protection.
• The porpoise's survival is closely connected to the health of the Yangtze ecosystem and the people who depend on it.