Comparative Study on the Feeding Metabolism and Carbon Budget of the Triploid and Diploid Pacific Oyster (Crassostrea gigas)

• Main Authors: Weiwei LI, Weiwei JIANG, Zengjie JIANG, Kai ZHANG, Dongjie WAN, Yazhou SHI, Weixin WANG, Yitao ZHANG
• Format: Article in Journal/Newspaper
• Language: English; Chinese
• Published: Science Press, PR China 2024
• Subjects: crassostrea gigas; triploid; diploid; summer high temperature; physiological energetics; Aquaculture. Fisheries. Angling; SH1-691; Crassostrea gigas; Pacific oyster
• Online Access: https://doi.org/10.19663/j.issn2095-9869.20230413001; https://doaj.org/article/ba7dcbe2118d422698b2b2497783e8d8

Crassostrea gigas, also known as Pacific oysters, are economic shellfish with the widest range of cultivation, the highest yield in the world, and the most important type of mariculture shellfish in China. However, many C. gigas have died during summer in coastal areas worldwide in recent decades. In 2008, the mortality rate of C. gigas cultured in France reached 40%–100%. In 2009, the mortality rate of C. gigas in some area of Sanggou Bay reached 51%. In 2019, the mortality rate of the Rushan area reached 50%–90%, with the death peak occurring in middle and late August. There were many reasons for the large-scale death of C. gigas, such as temperature, dissolved oxygen, salinity, disease, food availability, and reproduction levels, among which high temperature was the most important abiotic stress factor. The high temperature in summer disturbed the enzyme metabolism of C. gigas, resulting in slow or impeded growth. Furthermore, the reproduction and spawning of C. gigas caused a large amount of protein consumption, and physical weakness combined with high-temperature stress induced many deaths. Therefore, considering the problems faced by C. gigas culture during high summer temperatures, the introduction of new varieties will increase the economic benefits to the industry.Due to its high sterility, triploid C. gigas has attributes such as a fast growth rate, resilience excellent economic characteristics, and high energy conversion efficiency. In recent years, a certain farmed scale has formed in China, especially in northern coastal areas. There have been many studies on the biological and physiological differences between triploid and diploid C. gigas worldwide, mainly focusing on the differences in growth characteristics, soft tissue components, gonadal development, disease resistance, and gill structure. However, comparisons between triploid and diploid C. gigas feeding, metabolic physiology, energy budget, and carbon budget have not been reported. Focusing on the specific period of high temperatures in ...