Growth performance and physiological parameters of the second generation selected and control groups of Pinctada martensii

Abstract

In May of 2007, the second generation selected (SS) and control (SC) groups of pearl oyster Pinctada martensii were established by selecting 10% breeders with the largest and mean shell length, respectively, from the first generation selected group. Growth performance of the SS and SC groups were compared on the basis of measurement data at Days 8, 18, 60, 95, 195 and 365. On Day 365, 100 individuals (60.0-75.0 mm at shell length) were sampled from each group and then subjected to the experiment where physiological parameters such as filtrate rate, oxygen consumption and ammonia excretion were measured at 15, 20, 25 and 30 • C. The results show that the SS group had significantly larger mean shell length and shell height than the SC group at Days 8, 18, 60, 95, 195 and 365 (P <0.05). The genetic gains at different ages varied from 6.0% to 17.0% for shell length and 5.7% to 14.6% for shell height, respectively. At 15, 20, 25 and 30 • C, the SS groups had significantly larger filtrate rate than the SC group (P <0.05). At 15 and 25 • C, the differences in oxygen consumption rate between the SS and SC groups were not significant (P >0.05). At 20 and 30 • C, however, the oxygen consumption rate of the SS group was significantly larger than the SC group (P <0.05). At 15, 20, 25 and 30 • C, there were no significant differences in ammonia excretion rate between the SS and SC groups (P >0.05). The present results indicate that there existed considerable genetic variability in the base population and a further selection could be likely fruitful. Mass selection for faster growth might produce animals that had higher intake of metabolizable energy by virtue of faster filtrating behavior.

Comparison in Growth, Feeding, and Metabolism Between a Fast-Growing Selective Strain and a Cultured Population of Pearl Oyster (Pinctada fucata martensii)

“…P. f. martensii is the primary species cultured for marine pearls in China and Japan (Wang et al, 2011a). The pearl oyster industry has become one of the most important mariculture industries in several southern provinces of China, including Guangdong, Guangxi, and Hainan (Wang et al, 2004;Deng et al, 2009aDeng et al, , 2011He et al, 2021;Xu et al, 2021). However, the conditions are changing due to the slow growth and mass mortalities of oysters (Deng et al, 2011;Gu et al, 2011).…”

Association between Five Expressed Sequence Tag–Simple Sequence Repeat Markers and Four Growth Traits in Pinctada fucata martensii

“…The selected group displayed a 15.2% genetic gain in adult SL relative to the control after two generations of selection for superior growth in the base population of pearl oyster. There were significant correlations among the four growth traits (SH, SL, SW, and TW) (Deng et al ). Results demonstrated that the pearl diameter, weight, and nacre thickness showed significantly positive correlations with SH, SW, and TW (Shi et al ).…”

“…Accordingly, improvement of growth traits for recipient oysters can improve the pearl quality (Inoue et al 2011). To improve the productivity of P. 1 Correspondence to: aimwang@163.com fucata martensii, selective breeding programs have been initiated since 2002 and have led to the improvement of cultured stocks (Deng et al 2011).…”

Growth in pearl oysters: A review of genetic and environmental influences

“…penguin , a swift growth in the full diagonal length, shell height and hinge length with a declined growth were found from juvenile stage to adult stage (Gu et al, ). Genetic gains were also reduced for shell height and length at larval stages than the juvenile and adult growth period (Deng, Yu, Du, Wang, & Fu, ). In pearl oyster Pi.…”

“… Ref. (Deng, Fu, Liang, Du, & Xie, ; Deng, Yu, et al, ; Doroudi et al, ; Joubert et al, ; Liang et al, ; Mondal, ; Taylor et al, ). …”