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Ding, Fuhong; Lall, Santosh P.; Li, Jun; Lei, Jilin; Rommens, Melissa; Milley, Joyce E.
Cryobiology, 08/2011, Volume: 63, Issue: 1Journal Article
Development of Atlantic halibut ( Hippoglossus hippoglossus) aquaculture will be enhanced with cryopreservation of halibut sperm by ensuring a reliable supply of sperm of desired quality and quantity. To assist in its commercial application, the cryopreservation of large volumes of halibut sperm was investigated. Three cryoprotectants were compared: dimethyl sulfoxide (DMSO), polyethylene glycol (PG) and glycerol (GLY) at two concentrations (10% or 15%). Two salt solutions, Hanks’ balanced salt solution (HBSS) and 0.1 M KHCO 3 with 0.125 M sucrose solution (KS) were tested as diluents. Both factors were examined in 1.6 mL volumes. A cryopreservation volume of 4 mL and a low dilution ratio (1:1) were examined separately. Based on motility and fertilization rate, 10% and 15% DMSO diluted with HBSS or KS solution proved to be effective extenders with mean fertilization rates ranging from 52.2 ± 27.2% to 65.8 ± 26.1%; none of which were significantly different from that of the control. Four other extenders, 10% PG or 10% GLY with HBSS or KS, resulted in significantly lower fertilization rates. Use of a 4 mL cryopreservation volume did not exhibit a significant effect on fertilization rate or motility of post-thawed sperm compared to a 1.6 mL volume ( P > 0.05); while the use of a dilution ratio of one part sperm with three parts cryopreservation solution (1:3 v/v with sperm concentration of 0.51 ± 0.11 × 10 10 cells/ml) had a significantly better preservation effect than using a ratio of 1:1 with sperm concentration of 1.02 ± 0.21 × 10 10 cells/ml ( P < 0.05). From these results, an optimized protocol for the cryopreservation of Atlantic halibut sperm using a volume as large as 4 mL has been established.
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