Can we afford losing the Chinese Sturgeons in the Yangtze River? | Teen Ink

Can we afford losing the Chinese Sturgeons in the Yangtze River?

January 29, 2024
By IrisBian SILVER, Shanghai City, Other
IrisBian SILVER, Shanghai City, Other
8 articles 2 photos 0 comments

(Acipenser sinensis).

Bian Shiqi1

Abstract

Often regarded as a "living fossil" or the "panda under the water", the Chinese Sturgeon is one of the rarest and most representative species in the Yangtze River. Despite its fame, no signs of natural spawning among the wild sturgeon population have been observed in recent years, highlighting the urgent need for an appropriate conservation program. This paper provides an overview of the population, lifestyles, and habitat characteristics of the Chinese Sturgeon by utilizing historical data, recent monitoring data, and existing research conducted by experts. Additionally, this paper evaluates the effectiveness of sturgeon stocking and artificial propagation at the molecular ecological level.

Key words: Acipenser sinensis; living Habits; endangerment; conservation biology; dilemma.

 

Introduction

The Chinese Sturgeon can be found in various regions of the Yangtze River, including the upper, middle, and lower reaches, as well as offshore waters, making it a significant representative of the river's aquatic ecosystem [1-3]. Protecting the Chinese Sturgeon involves multiple aspects, such as fisheries management, engineering projects, policy implementation, and the overall well-being of the Yangtze River and its coastal communities [4]. In this study, we aim to propose effective strategies and recommendations for the conservation of the Chinese sturgeon. Our approach includes a systematic analysis of the species' life history and habitat characteristics, an assessment of the impact of water-related projects and human activities in the Yangtze River, and an evaluation of the existing conservation measures in place. Furthermore, we examine the current challenges faced in the conservation efforts. It is crucial to recognize that the conservation of the Chinese sturgeon goes beyond the preservation of a single fish species. The outcomes of these conservation efforts have far-reaching implications for maintaining biodiversity and ensuring the ecological health of the entire Yangtze River system [5-8]. Therefore, our study aims to provide comprehensive and detailed recommendations that take into account the broader ecological and socio-economic considerations of the Yangtze River and its surrounding communities.

1.Population overview

The Chinese Sturgeon is a member of the family Acipenseridae in the order Acipenseriformeshe. Its lineage dates back approximately 140 million years to the Upper Cretaceous period, marking the end of the Mesozoic Era [10-13]. Exhibiting anadromous behaviors, the Chinese sturgeon can be found primarily in China, Japan, South Korea, North Korea, and the Lao People's Democratic Republic [11,13]. The highest concentration of Chinese Sturgeon populations is found below the mainstem of China's Yangtze River, from the Jinsha River to the estuary [9,12]. Although they can also be spotted in other waterways like the Gan, Xiang, Min, Qiantang, and Pearl Rivers, the Yangtze River remains the sole breeding ground for Chinese sturgeons [14-15].

In the 1970s, the Yangtze River was home to over 10,000 Chinese Sturgeons capable of reproduction [16]. However, following the closure of the Gezhouba Dam in the 1980s, their numbers plummeted dramatically to a mere 2,176 individuals [13]. By 2000, their population had dwindled even further to just 363 sturgeons, amounting to one-sixth of the population in the 1980s [17]. As of 2010, it was estimated that only 57 wild Chinese Sturgeons remained. The natural population of Chinese Sturgeon is facing an imminent threat, while the quality of the artificially preserved population is still a concern [11-13].

As a national treasure, the Chinese Sturgeon has been classified as a first-class protected animal in China and was included in the 1988 list of key protected wild animals. In 1996[10], the Chinese sturgeon was listed as an Endangered (EN) protected species by the International Union for Conservation of Nature (IUCN). A year later in 1997, it was designated as a key protection target by the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES). Then in 2010, it was upgraded to a Critically Endangered (CR) protected species by the IUCN [7,15].

2. Living Habits

2.1 Anadromous behaviors

Chinese sturgeon is a typical anadromous migratory fish that thrives and nurtures itself in the coastal waters of China's continental shelf. Every year at the turn of spring and summer, Chinese sturgeons that reach sexual maturity will enter the seaport from the Yangtze River to start nearly 2 years of migration [6]. They travel upstream along the Yangtze River, and after more than a year's long journey arrive at their breeding sites: the upper zones of the Yangtze River and the Jinsha River band. After mating and spawning, Chinese sturgeons travel downstream back to the sea[11.14].

2.2 Life history

The life history of Chinese sturgeons commences in the freshwater spawning grounds. Juveniles hatch and reside in the shallow waters of the beaches, actively seeking nourishment. They undergo a transformation phase in the estuaries before finally reaching the vast expanse of the sea. After more than a decade, sexually mature sturgeons instinctively navigate their way to the mouth of the Yangtze River. During the summer months, they journey upstream, seeking the upstream spawning grounds for winter and adapting their migration patterns based on prevailing water conditions. In the subsequent fall, parent sturgeons return to the spawning grounds once again for natural reproduction [13]. For Chinese sturgeons, the ratio of their entire life history spent in freshwater versus seawater is 1:9 to the Yangtze River and the ocean. Every stage of their life cycle holds immense significance [3,6,11]. This comprehensive understanding of the Chinese sturgeon's life history sheds light on its incredible resilience and emphasizes the crucial importance of each phase it undergoes.

3. Reasons for endangerment

The endangerment of the Chinese sturgeon is the combined result of various factors, primarily including the following aspects:

3.1 Destruction of habitat

The development of water conservancy projects, including reservoir construction and river diversion, has significantly diminished the survival space available for the Chinese sturgeon, resulting in severe damage to its native habitat. Firstly, these projects have brought about notable alterations in the speed and direction of river currents, which are vital for the sturgeon's ecological balance. Secondly, reconstructions on siltation and river beds have caused a decline in the quality of habitats for the sturgeon. Furthermore, the construction process has introduced disturbances such as noise, vibration, and light pollution, significantly disrupting the sturgeon's biological life cycle. Additionally, the construction activities often involve extensive land exploitation and indiscriminate logging, further exacerbating the destruction of the Chinese sturgeon's habitat. Consequently, the loss of aquatic vegetation poses a significant threat to the species' survival [2, 4, 10, 17]. Moreover, global warming and alterations in precipitation patterns have led to shifts in the climatic and hydrological conditions within the sturgeon's habitat, presenting new challenges for its survival.
3.2 Overfishing

The significant decline in the Chinese sturgeon population can also be attributed to continuous periods of overfishing, haphazard harvesting, and illegal fishing by humans. These large-scale commercial fishing activities have had a detrimental impact on the Chinese sturgeon, leading to a continuous decline in their populations. Compounding this issue is the fact that the Chinese sturgeon has a prolonged growth rate and lengthy reproduction cycle, making it even more challenging for them to recover from the effects of overfishing [13].

3.3 Water pollution

Another major factor contributing to the endangerment of the Chinese sturgeon is water pollution. As industrialization and urbanization progress, substantial amounts of industrial wastewater, agricultural non-point source pollution, and domestic sewage are being discharged into water bodies without proper regulation. This has resulted in an alarming increase in the concentration of pollutants in the water, posing a serious threat to the survival of the Chinese sturgeon. Water pollution destroys the habitat of Chinese sturgeon, making it impossible for them to reproduce normally. The pollutants will also harm the physiological functions of the sturgeon, triggering diseases and damage to the immune system, which can directly threaten their survival. For instance, algae outbreaks triggered by water pollution can cause a shortage of oxygen in the water, adversely affecting the respiration and feeding processes of the sturgeon[18].

4. Measures to protect Chinese sturgeons

4.1 Engineering measures

In terms of engineering measures, combining the anadromous characteristics of Chinese sturgeon during the breeding period and the features of the dams can be utilized to rehabilitate existing spawning grounds of Chinese sturgeon [19]. Concurrently, enhancing the flow field and quality of the riverbed at existing Chinese sturgeon spawning grounds can improve the scale and effectiveness of natural breeding by increasing the reproduction capacity of these natural spawning grounds [20-22]. These measures will ensure the long-term survival of the Chinese sturgeon species.

4.2 Constructing fish passage

The barrier effect on the river caused by the construction of the Gezhouba Dam hydraulic hub is the most direct factor hindering the spawning and reproduction of Chinese sturgeon. To address this problem, constructing a fish passage project is the most practical and efficient measure [23-25]. This method is already widely employed worldwide. By using different water currents, fish are led through the fish inlet and to the upper reaches of the dam, which is referred to as constructing fish passage [17, 21, 26]. However, the effectiveness of this method depends on the level of design of overfishing engineering measures, such as whether the flow rate at the inlet can be appropriately controlled and whether the fish can recognize the induced flow. Presently, primary fish passage infrastructures include fish gates, fish lifts, fish boats, and other ancillary measures [27-30]. Implementation of these measures can mitigate the negative effects caused by the construction of the Gezhouba Dam hydraulic hub and help enhance the survival of the Chinese sturgeon species.

4.3 Non-engineering measures

One crucial non-engineering measure is to expand the artificial breeding and releasing program. This involves artificially rearing broodstock, assisting in their spawning and hatching, and releasing the fry into the wild. Currently, this method is considered the most effective way to protect endangered fish species, including the Chinese sturgeon. To ensure the survival rate of Chinese sturgeon reproduction, it is recommended to conduct annual artificial breeding and release of at least 50,000 Chinese sturgeons [31-33]. Additionally, there is a need to enhance the assessment of the efficiency of artificial breeding and releasing.

4.4 Establishing real-time monitoring systems

While restoring and protecting individual Chinese sturgeon, it is also necessary to increase the monitoring of the aquatic ecological environment, parental fish cultivation, fry cultivation, migration environment, and population resources in the existing spawning grounds[25,34-36]. In particular, it is imperative to intensify monitoring of the gender and age ratio within the Chinese sturgeon community. In addition to this, the cultivation of parent fish and fry, the dynamic distribution of stocks, and the real-time situation of spawning grounds and migration paths should receive rigorous monitoring and evaluation [37].

4.5 Emphasis on ecological scheduling

 Based on an analysis of the spawning and reproduction habits of the Chinese sturgeon, it is evident that specific hydrological conditions are necessary for successful spawning. Therefore, by restoring the spawning grounds and manipulating the hydrological conditions, spawning and reproduction can be promoted. Furthermore, rational management of the Three Gorges Reservoir can compensate for the hydrological conditions required in the river section below the dam, thus safeguarding the natural spawning and reproduction of the Chinese sturgeon [27,38].

4.6 Enforcing government legislation

  Excluding the number of Chinese sturgeons that have been maliciously killed by humans, there are still hundreds of Chinese sturgeons that get accidentally injured every year despite the construction of protection stations along the Yangtze River[39-41]. They were often mistakenly caught by fishermen, injured by ship turmoils, and disabled by water pollution. It is thus reasonable to infer that the conservation efforts on Chinese sturgeons are inadequate and that the effects are unsatisfactory. To deal with this situation, the Government can regulate human behavior by establishing laws to prohibit fishing for a certain period, regulate navigation, and preserve water quality. These regulations can provide legal safeguards for the implementation of Chinese sturgeon conservation programs.

5 Discussion

5.1 Reasons for delays in conducting reproductive research

The artificial propagation of Chinese sturgeon has demonstrated success in previous years. Notably, in the 1970s, the Chongqing Institute of Fisheries achieved artificial fertilization of 114,000 eggs and produced over 1,300 seedlings. Subsequently, in 1978, there was another successful instance of artificial propagation [22]. In 2019, the Three Gorges Group Chinese Sturgeon Research Institute accomplished complete artificial propagation of the Chinese sturgeon. Moreover, during the first six months of of 2022, significant progress was made in the large-scale artificial breeding of Yangtze sturgeon [31]. The breakthrough in July 2022 with the development of artificial induction techniques for female nuclei of the Chinese sturgeon marked a significant milestone, enabling unisexual reproduction for the first time. This breakthrough holds immense importance for the long-term preservation of germplasm resources.

Despite these achievements, the slow progress in reproduction research can be attributed to several factors. One major obstacle is the prolonged lifespan and late sexual maturity of Chinese sturgeon, which necessitates a substantial amount of time and effort for artificial breeding research [37]. Furthermore, even minor adjustments in factors such as food supply, water temperature, water quality, and breeding space can yield entirely different research outcomes. Another challenge lies in the limited number of sturgeon groups available for cultivation, making it challenging to conduct comparative experiments in the field of Chinese sturgeon full artificial breeding technology. These factors collectively contribute to the sluggish pace of research on the complete artificial reproduction of Chinese sturgeon.

 

5.1.1Reproduction difficulties and loss of genetic diversity

Chinese sturgeon require a minimum of 16 years to reach sexual maturity, and the survival rate for their fry is alarmingly low. Despite releasing over 7 million individuals into the Yangtze River, only 1% have managed to survive [23, 37, 39]. Compounding the issue, sturgeon only spawn under specific conditions, particularly requiring mild temperatures. Unfortunately, human activities have led to the deterioration of the water ecosystem, resulting in the destruction of the sturgeon's migration path. Furthermore, the construction of dykes and hydroelectric power projects has had a negative impact on the ecological environment as well [40]. To address this problem, several measures need to be implemented, including reducing pollutant discharge, optimizing engineering project planning in the region, and establishing a monitoring system for fish migration.

Scientific research surveys conducted in the previous years have revealed an alarming discrepancy in the male-to-female sex ratio of the Chinese sturgeon spawning population below Gezhouba Dam. The data shows that from 2003 to 2004, the ratio was approximately 6:1 [31], and in 2008, when scientific research fish were captured at the spawning site, the male-to-female ratio was close to 7:1 [32]. After 2008, the Ministry of Agriculture did not permit any further Chinese sturgeon scientific research fishery until 2015 [38]. In this year, however, no Chinese sturgeon parents were caught by the Yangtze River Fisheries Research Institute, making it impossible to obtain updated figures. Despite this lack of recent data, it can be inferred that the imbalance in the male-to-female ratio is continuing to rise based on the survival trend of the Chinese sturgeon population and their environment since 2008 [32, 35, 39].

5.1.2 Loss of genetic diversity

Genetic diversity serves as the foundation for both species diversity and ecosystem diversity. A species with a greater genetic diversity possesses a heightened capacity to adapt to external changes. Exploring the genetic diversity of Chinese sturgeon allows researchers to gain insight into its crucial role in the evolutionary history of fish, analyze its potential for evolution, and investigate its endangered status. Since the wild population of Chinese sturgeons has been on the verge of extinction, comprehending the genetic structure and diversity of this species becomes imperative for effective monitoring and conservation efforts [36,42].

5.2Modern biotechnology

The advancement of modern biotechnology has simplified the task of conserving the Chinese sturgeon. The utilization of various breeding methods serves as a valuable blueprint for achieving comprehensive artificial breeding of Chinese sturgeon in the future. Exploring alternative approaches like exogenous hormone induction holds promise in promoting the reproductive development of Chinese sturgeon [32-35,42,43]. As the technology for full artificial propagation of Chinese sturgeon continues to improve, there is potential to rescue the endangered wild population. 

In response to the problem of an imbalanced ratio of female to male Chinese sturgeons, scientists have put forward a potential solution. They have suggested a unique reproductive technique known as mono-female reproduction, or solitary reproduction, wherein the eggs can develop into viable individuals without being fertilized by normal sperm [42]. Essentially, this means that reproduction can occur solely with female sturgeons, eliminating the need for males. Additionally, another approach to address this issue involves the utilization of ultra-low temperature cryopreservation of Chinese Sturgeon sperm and subsequent insemination with frozen sperm. These alternative methods have the potential to partially alleviate the challenge posed by the disproportionate number of female sturgeons compared to males.

Molecular genetic markers have become a popular tool in studying the genetic diversity of organisms. These markers are generally not affected by environmental factors, and the polymorphisms can be found throughout the genome, making them widely distributed [31, 34, 44]. The results obtained from molecular-level biodiversity research are considered stable, reliable, and reproducible. Currently, the study of Chinese sturgeon DNA molecular genetic diversity primarily focuses on three types of markers: mitochondrial DNA (mtDNA), Randomly Amplified Polymorphic DNA (RAPD), and microsatellite markers [27-31, 37, 44]. These methods have been used to investigate the genetic diversity of Chinese sturgeon populations, providing valuable insights into the species' biology and evolution.

6. Conclusion

Given the current circumstances, it is crucial to prioritize the "Chinese sturgeon rescue action plan" as a guiding framework and urgently implement five key protection measures. Firstly, the implementation of the "land-sea-land" seeding project is vital to restore the biological characteristics of cultured Chinese sturgeons. Secondly, it is essential to strengthen restocking programs to replenish the sturgeon population. Thirdly, improving existing spawning conditions is necessary to facilitate natural reproduction. Moreover, efforts should be made to explore alternative natural spawning grounds. Lastly, restoring feeding grounds and other critical habitats must be undertaken. These protection measures require long-term commitment, spanning approximately 15 years, and involve safeguarding the sturgeonsfrom birth to breeding to achieve the restoration and continuity of the natural sturgeon population. The Chinese sturgeon, with its impressive body size, lengthy lifespan, and extensive migration patterns, holds great importance as the flagship species and umbrella species within the Yangtze River ecosystem. The successful conservation of the Chinese sturgeon is of significant significance in attaining harmonious coexistence between humans and nature while promoting the sustainable development of the Yangtze River Basin.

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The author's comments:

Being deeply passionate about environmental protection and the sustainable development of our planet's aquatic ecosystem, I strongly feel a sense of duty to safeguard the distinct fish species that inhabit the Yangtze River. The Yangtze River holds immense significance as both a vital source of livelihood for millions and a nurturing force for countless lives. Witnessing the alarming decline of these national treasures is truly disheartening. Although I haven't had the opportunity to personally encounter many of these fish species, my connection to them runs deep as they represent an integral part of China's natural heritage. The recent announcement by the IUCN regarding the functional extinction of the Baiji dolphin (Lipotes vexillifer) and the white sturgeon (Psephurus gladius), along with the severe endangerment faced by the Chinese sturgeon, has awakened a sense of urgency within me to raise awareness about the disappearance of these ancient creatures. It is truly distressing to contemplate how species that have thrived for thousands of years are now on the verge of vanishing forever within such a short span of time. Therefore, I am committed to advocating for the protection and restoration of the Yangtze River's unique fish species. Through this article, I aim to educate and inform more people about these disappearing "living fossils" of the Yangtze River. By increasing understanding and knowledge about these remarkable creatures, I hope to inspire a collective effort to safeguard their existence. 


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