Abstract
In the present study, methodology of gynogenetic induction in spotted halibut were developed and optimized; the sex ratio of putative meiotic gynogenetic diploids was determined using AFLP-based molecular sexing technique; the homozygosity of gynogenetic population was assessed as opposed to cultivated population. The results showed that high percentage of meiotic gynogenetic diploids were generated when the eggs fertilized with irradiated heterologous sea perch frozen sperm (30–50 mJ cm−2) were cold shocked in sea water of −1°C for 40–75 min at 5 min after fertilization. About 15,200 diploid gynogenetic larvae were achieved and they exhibited normal morphology similar to diploid control. The gynogenetic diploids were 100% female, which first confirmed the female homogamete (XX/XY) sex determination in spotted halibut. The genetic analysis showed that the average H O was, respectively, 0.404 and 0.724 in gynogenetic population and cultivated population, indicating an increase of homozygosity in gynogenetic population.
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Acknowledgments
We would like to express our thanks to Mr. Liu Shoutang in Haiyang fisheries Co., Ltd. for providing spotted halibut eggs and experimental fish. This work was supported by grants from State 863 High-Technology R&D Project of China (2006AA10A403), Shandong Genetic Improvement Key Project for Agricultural Organism, and Taishan Scholar Project of Shandong Province.
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Ji, XS., Chen, SL., Yang, JF. et al. Artificial gynogenesis and assessment of homozygosity in meiotic gynogens of spotted halibut (Verasper variegatus). Aquacult Int 18, 1151–1161 (2010). https://doi.org/10.1007/s10499-010-9330-y
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DOI: https://doi.org/10.1007/s10499-010-9330-y