Growth and Quality Traits of Low-Copper Strains of Fujian Oyster
TANG Hongning1, ZHANG Hong1, QUE Huayong1, GONG Shihai2, SHI Bo1
1. State Key Laboratory of Mariculture Breeding, Fisheries College, Jimei University, Xiamen 361021, China; 2. College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
Abstract：In order to investigate the quality traits including growth traits, mineral and glycogen contents of Fujian oyster Crassostrea angulata, three consecutive generations of population breeding were bred, and the female and male low-copper content breeding oyster lines were selected by 20% selection pressure, and the low-copper F3 generation breeding lines were obtained after selective breeding, and then the Fujian oyster in self-propagation group and the ordinary breeding population of the oyster were ordinarily conducted in the oyster culture area of Zhao'an Bay, Fujian Province. The attached and metamorphosis juveniles were transferred to Hui'an area of Quanzhou for further culture for 3 months, and then transferred to cage culture in Liu'ao and Lianjiang areas of Fujian Province, and compared with ordinary breeding groups. The growth traits and quality traits were detected including contents of glycogen, minerals, and protein in 6, 9 and 12 months old Fujian oyster. The results showed that the low-copper and common Fujian oyster had copper (Cu) content from 114.24 to 750.50 μg/g and 146.56 to 981.04 μg/g, respectively, with zinc (Zn) content from 482.84 to 1 786.73 μg/g and 584.91 to 2 123.09 μg/g, and the cadmium (Cd) content from 1.77 to 4.18 μg/g and 1.87 to 4.70 μg/g, respectively. Significant differences in the accumulation of Cu, Zn, and Cd were observed between the common and low-copper groups in both sea areas (P<0.05), with differences in Cu content between the two groups ranging from 1.2 to 2.3 times, and Zn content differences ranging from 1.2 to 1.7 times. However, there were no significant differences in growth traits, minerals except for Cu, Zn, and Cd, glycogen, lipids, total protein, or ash contents between the two groups (P>0.05), indicating that the low-copper strains had both significant reduce in Cu accumulation capacity and significant changes in Zn and Cd accumulation. There were no significant differences in growth and quality traits compared to the common cultured populations. The findings contribute to deeper understanding of the mechanisms of metal accumulation in shellfish and provide essential data for the genetic improvement of copper accumulation traits in the oyster and the application of new breeding lines.
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2025, Vol. 44 
