Embryonic and larval development of a hybrid between kelp grouper Epinephelus moara ♀ × giant grouper E. lanceolatus ♂ using cryopreserved sperm |
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| Authors: | Zhang‐Fan Chen Yong‐Sheng Tian Peng‐Fei Wang Jiang Tang Jiang‐Chun Liu Wen‐Hui Ma Wen‐Sheng Li Xiao‐Mei Wang Jie‐Ming Zhai |
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| Affiliation: | 1. Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Qingdao, China;2. Laboratory for Marine Fisheries Science and Food Production Processes, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China;3. Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou, China;4. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai, China;5. Ming Bo Aquatic Co. Ltd., Laizhou, China |
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| Abstract: | Hybridization was used to take advantage of desirable traits in offspring. In the present study, we applied the cryopreserved Epinephelus lanceolatus sperm into interspecific hybridization with E. moara. Successful hybridization between these two species was achieved and cultured in 23–24°C seawater (34‰). There was no difference in survival rate between hybrid (E. moara ♀ × E. lanceolatus ♂) and non‐hybrid (E. moara ♀ × E. moara ♂) at 24 hrs post hatch (HPH), but less hybrid (14.35 ± 8.02%) hatched than non‐hybrid (93.60 ± 1.65%), which might be due to irregularity cell cleavage and skeletal deformities from the formation of embryonic body to the later embryonic development. Similar phenomenon was found in hybrid embryos from fertilization with fresh sperm, indicating that species variations between parents, rather than cryopreserved sperm, resulted in deformities in embryos. Mean hatch time of the hybrid was 1 hr faster than that of E. moara. The hybrid was 1.95 ± 0.06 mm in total length when newly hatched and reached 38.00 mm at 58 days post hatch (DPH), which showed faster growth than E. moara (recorded in the previous study). Considering its faster growth, E. moara × E. lanceolatus hybrid was a potential breeding production in aquaculture. Over 212,000,000 larvae have been produced and launched in the market since 2015. The results of this study also shed some lights on further comparative studies in grouper hybrid performance. |
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| Keywords: | embryos and larvae
Epinephelus lanceolatus
Epinephelus moara
hybridization sperm cryopreservation survive and growth |
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