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Cryopreservation of Mekong catfish, Pangasius bocourti Sauvage, 1880 spermatozoa

Authors

  • Supannee Kainin,

    1. Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand
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  • Samorn Ponchunchoovong,

    Corresponding author
    1. Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima, Thailand
    • Correspondence: Samorn Ponchunchoovong, Institute of Agricultural Technology, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand. E-mail: samorn@sut.ac.th

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  • Unnop Imsilp,

    1. Department of Fisheries, Nong Khai Inland Fisheries Research and Development Center, Si Chiang Mai, Nong Khai, Thailand
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  • Sombut Singsee

    1. Department of Fisheries, Nakhonphanom Inland Fisheries Research and Development Center, Amphoe Muang, Nakhon Phanom, Thailand
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Abstract

The effects of three extenders (Ginzburg fish ringer, Calcium-free Hank's balanced salt solution, C-F HBSS and sodium chloride, 0.9% NaCl) and four cryoprotectants (dimethyl sulphoxide, DMSO; dimethyl acetamide, DMA; methanol, MeOH and glycerol) in different concentrations (5%, 10% and 15%) on the motility, viability and fertilization rates of Mekong catfish (Pagasius bocourti) sperm were investigated. Sperm samples were transferred into 250-μL French straws and sealed with a heated haemostat. The straws were then placed in a cryochamber. A computer-controlled rate freezer (CL 3300) and programmable Cryogenesis, version 4 were used to regulate the freezing rate. The sperm samples were frozen at a rate of 10°C min−1 from 4 to −80°C and then evaluated after 72 h. Of the three extenders used with each cryoprotectant, C-F HBSS had the highest fertilization rate of 75% (93% of control). This was not significantly different from the control treatment (fresh sperm) when tested with DMSO as the cryoprotectant. The lowest fertilization rate of 27% (38% of control) was resulting from the combination of 15% glycerol and C-F HBSS. This study found that fertilization, motility and viability rates in all of the experiments had a positive significant correlation (< 0.001).

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