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Study on Ultrastructure of Schizothorax davidi Sperm

YANG Shi-yong et al(Fishery Department of Sichuan Agricultural University,Ya'an,Sichuan 625014)  
[Objective] The purpose was to supply base data for breeding biological research on Schizothorax davidi.[Method] With sexual mature S.davidi as tested animals,the ultrastructure of its sperm was observed by using transmission electron microscope and scanning electron microscope.[Result] The whole length of S.davidi sperm was 23.81 μm and it was composed of head,mid-piece and tail.Its nucleus was orbicular-ovate with dense chromatin and rarely scattered germinal vesicle and without acrosome.Its implantation fossa was located behind nucleus and relatively shallow.The mid-piece was closely connected to nucleonic end and composed of centriole complex and muff.The long axises of proximate centriolar and nucleus formed a included angle of about 120° and formed a "V" with base body and the muff contained mitochondria and vesicles.Its tail length was 20.69 μm,with typical "9+2" micro-tubular structure and without lateral fin on its two sides.[Conclusion] The ultrastructure of S.davidi sperm was consistent with the overall structure mode of Osteichthyes sperm.
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