Growth performance and biochemical composition of the oysters Crassostrea sikamea,Crassostrea angulata and their hybrids in southern China |
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| Authors: | Lulu Yan Jiaqi Su Zhaoping Wang Yuehuan Zhang Xiwu Yan Ruihai Yu |
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| Affiliation: | 1. Key Laboratory of Mariculture, Ministry of Education, Fisheries College, Ocean University of China, Qingdao, China;2. South China Sea Fisheries Research Institute, Chinese Academy of Fishery Science, Guangzhou, China;3. Key Laboratory of Tropical Marine Bio‐resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, China;4. Engineering Research Center of Shellfish Culture and Breeding of Liaoning Province, College of Fisheries and Life Science, Dalian Ocean University, Dalian, China |
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| Abstract: | The Kumamoto oyster (Crassostrea sikamea) and the Portuguese oyster (C. angulata) are important aquaculture species which naturally coexist along the southern coast of China. To understand the potential feasibility of hybridization between the two species, we conducted two‐by‐two factorial cross‐experiments in Beihai (Guangxi province), and also compared the survival and growth of the hybrids to that of the two parental progenies during the grow‐out period from July 2014 to July 2015. Genetic analysis confirmed that the hybrid spats were true hybrids. Additionally, the biochemical composition of the 1‐year‐old oyster progenies was determined. In July 2015, the mean shell height of the hybrids was 42.98 ± 6.29 mm, which was higher than that of the Kumamoto oyster progeny. The cumulative survival rate of the hybrids was 26.37 ± 1.32%, which was higher than that of the progeny of the Portuguese oyster. Mean lipid content of the hybrids was 13.65 ± 1.63% of dry weight, which showed obvious heterosis compared to those of the two parental progenies. Observation of gonads revealed that all hybrids were completely fertile. Furthermore, relative expression of the lipid homeostasis genes, SREBP (sterol regulatory element‐binding proteins), PPARα (peroxisome proliferator‐activated receptor) and INSIG (insulin‐induced gene) were found to vary between parental progenies and the hybrids, thus providing a possible reason for difference in the lipid contents of these experimental groups. Overall, the hybrids were viable, rich in lipid and completely fertile and thus could serve as a promising aquaculture stock for oyster breeding in southern China. |
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| Keywords: |
Crassostrea angulata
Crassostrea sikamea
heterosis interspecific hybridization |
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