담수순화 감성돔(Acanthopagrus schlegeli) 정자의 냉동보존 조건별 활성평가
Assessment of Sperm Activity of Black Porgy(Acanthopagrus schlegeli) Acclimated in Freshwater on Cryopreservation Condition
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초록
담수에서 사육한 감성돔 Acanthopagrus schlegeli(담수감성돔) 냉동/해동 정자의 생존율이 가장 높았던 결빙억제제(cryprotective agent, CPA)는 dimethyl sulfoxide(DMSO)였으며, 다음으로 glycerol, ethylene glycol(EG) 그리고 methanol 순이었다. 해동 후 정자운동성은 glycerol, DMSO, EG, methanol 순으로 높았으며, 이상의 결과들은 해수에서 사육한 감성돔(해수감성돔)에서도 나타났다. 담수 및 해수감성돔 정자의 냉동보존시 적정 CPA는 DMSO와 glycerol이었으며, 생존율과 정자운동성이 가장 높았던 적정 농도는 모두 10%였다. 특히 10% DMSO로 냉동보존한 담수 및 해수감성돔 해동정자의 생존율과 정자운동성은 10% glycerol로 냉동보존한 해동정자보다 높게 나타났다. 냉동보존기간에 따른 담수 및 해수감성돔 해동정자의 생존율과 정자운동성을 측정한 결과, 대부분 보존기간이 길어질수록 감소하였으며, CPA의 농도가 높을수록 생존율과 정자운동성은 급격히 감소하였다. 그러나 5% DMSO로 냉동보존한 해동정자의 생존율 및 정자운동성은차이는 보이지 않았다.
Abstract
Various cryoprotective agents (CPA) were tested to establish the best conditions for the cryopreservation of sperm from black porgy Acanthopagrus schlegeli acclimated and raised in freshwater (BFW). Survival rates of frozen/thawed sperm from BFW were higher in the order of dimethy sulfoxide (DMSO), glycerol, ethylene glycol (EG)and methanol. Sperm motility was higher in the order of glycerol, DMSO, EG and methanol. These effects were the same in thawed sperm from black porgy raised in seawater (BSW). Thus, optimum CPA for sperm cryopreservation of BFW and BSW were DMSO and glycerol where the highest survival rates and sperm motility were found at the concentration of 10%. In particular, the survival rates and motility of thawed sperm from BFW and BSW after cryopreservation using 10% DMSO were better than when cryopreserved using 10% glycerol. On the other hand, for the thawed sperm from both BFW and BSW, the longer the preservation period was, the lower the survival rates and sperm motility were. Notably,the higher the concentration of CPA was, the lower the survival rates and sperm motility were.
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