Carp and squid are common freshwater species that often appear on dining tables. However, due to improper long-term management and breeding practices, the diversity, production, and quality of these fish have significantly declined, which has negatively impacted consumer demand. To address this issue, Professor Liu Yan from the College of Life Sciences at Hunan Normal University and an academician of the Chinese Academy of Engineering successfully developed a stable tetraploid fish population using biological cell engineering technology. This breakthrough not only provides important theoretical support for understanding polyploidy in fish but also opens new possibilities for fish polyploid breeding. The achievement was awarded the Second Prize of National Scientific and Technological Progress in 2003.
The successful application of allotetraploid fish in large-scale production has led to the development of high-quality triploid carp and squid. These fish exhibit excellent growth rates, larger sizes, complete infertility, strong stress resistance, and superior taste. Two invention patents—“Tetraploid Fish Breeding Method†and “Triploid Oyster Fish Production Method and Equipmentâ€â€”were selected as national “863†pilot projects and implemented by Hunan Xiangyun Biotechnology Co., Ltd. in 2001. The company has since achieved industrial-scale production, with an annual output of 1 billion triploid fish seedlings. These seedlings have been widely promoted across all provinces and cities except Tibet and Taiwan. To date, over 2 billion seedlings have been produced, covering nearly 100 million mu of aquaculture areas. Triploid carp and squid are highly favored by consumers due to their fast growth, robust health, and superior flavor, commanding prices much higher than ordinary varieties. These products are also exported to Japan, South Korea, and Southeast Asia, generating an annual direct economic benefit of approximately 1 billion yuan.
Since triploid fish are completely infertile, they play a crucial role in preventing the ecological damage caused by overbreeding and hybridization in aquaculture. By introducing triploid fish into water bodies, farmers can avoid the risks of uncontrolled reproduction and genetic pollution. This approach helps protect natural ecosystems and ensures sustainable aquaculture practices. Whether it's Yunyi or Xiangyun squid, triploid fish can be stocked in any farmed environment without the risk of natural reproduction or harm to native species.
Unicom: Hunan Xiangyun Biotechnology Co., Ltd. Zhang Bing Tel: 0736-7301999 13973661742 QQ
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