Carps and squids are well-known freshwater fish species that are commonly featured on dining tables. However, due to improper long-term breeding and management practices, the variety, production, and quality of these fish have significantly declined, which has negatively impacted consumer interest. 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 population of new tetraploid fish with consistent genetic traits and strong reproductive capabilities using biological cell engineering technology. This breakthrough in creating allogenic tetraploid fish populations provides essential theoretical support for studying polyploid formation mechanisms in fish and opens up new possibilities for polyploid fish breeding. The achievement was awarded the Second Prize for National Scientific and Technological Progress in 2003.
The two invention patents, “Tetraploid Fish Breeding Method†and “Triploid Oyster Fish Production Method and Equipment,†were included in the national “863†pilot program and were implemented by Hunan Xiangyun Biotechnology Co., Ltd. in 2001. The company has since achieved large-scale industrial production, with an annual output of 1 billion triploid carp seedlings. These seedlings have been widely promoted across all provinces and cities except Tibet and Taiwan. Since the implementation of the patents, a total of 2 billion seedlings have been produced, and nearly 100 million mu of aquaculture areas have been covered. Triploid Carassius auratus and Carassius carpio are highly favored by consumers due to their fast growth, large size, complete infertility, strong stress resistance, and excellent taste. Their market price is significantly higher than that of ordinary carp and squid. These products are also exported to Japan, South Korea, and Southeast Asia, generating an annual direct economic benefit of approximately 1 billion yuan.
Because triploid fish are completely infertile, they play a crucial role in addressing issues such as overstocking and genetic degradation in aquaculture. The triploids produced through allotetraploid breeding are especially valuable. Yunyi and Xiangyun squids can be stocked in any aquaculture environment without reproducing naturally or harming native species, thus protecting natural resources and the ecological balance effectively.
Unicom: Hunan Xiangyun Biotechnology Co., Ltd. Zhang Bing Tel: 0736-7301999 13973661742 QQ
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