Abstract
This study aimed to find an optimal diluent and cryoprotective agent (CPA) during cryopreservation of common Korean bitterling Acheilognathus signifier sperm. The bitterling is an endangered species in Korea, and this study will enable conservation and further technical development of artificial seed production. We tested the effects of cryopreservation and toxicity by the type of diluent and CPA. The optimal combination of diluent and CPA for cryopreservation was 300 mM glucose+10% methanol, resulting in a survival rate and sperm activity index (SAI) of <TEX>$96.3{\pm}1.5%$</TEX>, and <TEX>$3.0{\pm}0.0$</TEX> respectively, and no significant difference compared to fresh sperm. The survival rate and SAI of post-thawed sperm was <TEX>$9.7{\pm}1.5%$</TEX>, <TEX>$0.8{\pm}0.3$</TEX> respectively, which was significantly higher than had been achieved with other diluents and CPAs.
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