Threats
Major Threats
This species has been historically overfished. In the 1970s, fishing was unlimited, but seasonal (occurring mostly between October and November). Gear types include gill nets (upper reach) and row hooks (middle reach). Due to its life history characteristics, once depleted, stocks of this species take a long time to recover. Fry are also captured by traditional Chinese fishing methods (drift nets in the river and set nets at the river mouth).
Habitat fragmentation, alteration, destruction and changes to hydrological conditions also significantly impacts this species. The construction of the Gezhouba dam in 1981 blocked the migration routes of this species, making it impossible for it to reach spawning sites in the upper reaches of the river. Currently, there is just one remaining spawning ground, which is situated below the Gezhouba dam.
In 2003, the Three Gorges dam was constructed 40 km upstream of the Gezhouba dam. This has changed the hydrological regime (lowering the water level of the river in autumn and winter) and affected the water temperature.
Additionally, an increase in the amount of shipping traffic in the Yangtze river could be detrimental to the Chinese Sturgeon.
New evidence shows that water pollution is a potential factor lead to the decline of Chinese Sturgeon. Synthetic chemicals in water could contribute to the population decline of this species by significantly decreasing both the quality and quantity of eggs and spawning frequency of fish (Hu 2009).
Habitat fragmentation, alteration, destruction and changes to hydrological conditions also significantly impacts this species. The construction of the Gezhouba dam in 1981 blocked the migration routes of this species, making it impossible for it to reach spawning sites in the upper reaches of the river. Currently, there is just one remaining spawning ground, which is situated below the Gezhouba dam.
In 2003, the Three Gorges dam was constructed 40 km upstream of the Gezhouba dam. This has changed the hydrological regime (lowering the water level of the river in autumn and winter) and affected the water temperature.
Additionally, an increase in the amount of shipping traffic in the Yangtze river could be detrimental to the Chinese Sturgeon.
New evidence shows that water pollution is a potential factor lead to the decline of Chinese Sturgeon. Synthetic chemicals in water could contribute to the population decline of this species by significantly decreasing both the quality and quantity of eggs and spawning frequency of fish (Hu 2009).
