Commercial-scale sperm cryopreservation of diploid and tetraploid Pacific oysters, Crassostrea gigas.
Cryopreservation of sperm from tetraploid organisms (the possession of four chromosome sets) is essentially unexplored. This is the first cryopreservation study to address sperm from tetraploid Pacific oysters, Crassostrea gigas, and addresses the commercial production of triploid oysters (three chromosome sets). Initial motility, refrigerated storage of undiluted sperm, osmolality of extender solutions, sperm concentrations, equilibration time, and cryoprotectants of propylene glycol and dimethyl sulfoxide were evaluated with sperm from diploid and tetraploid oysters. Unlike most teleost fishes, in which the duration of active motility is typically brief, the motility of sperm from oysters lasts for hours. The present study showed that responses to treatment effects by sperm from tetraploids were different from diploids. The majority of tetraploid experiments resulted in less than 10% motility after thawing and less than 5% fertilization. The highest fertilization obtained for thawed sperm was 96% for sperm from diploid oysters and 28% for sperm from tetraploid oysters. Differential responses to treatments by sperm from tetraploid and diploid oysters may be due to differences in gonadal development. However, the use of cryopreserved sperm from tetraploid Pacific oysters produced 100% triploid offspring by fertilization of eggs from diploid females as determined by flow cytometry of larvae. This study demonstrates that sperm from tetraploid oysters can be collected, frozen, and stored for production of triploid offspring.
Dong
Qiaoxiang
Q
Aquaculture Research Station, Louisiana Agricultural Experiment Station, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA. qdong@agctr.lsu.edu
Eudeline
Benoit
B
Huang
Changjiang
C
Allen
Standish K
SK
Tiersch
Terrence R
TR
D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism; D015925:Cryopreservation / Q000379:methods*; D003451:Cryoprotective Agents / Q000494:pharmacology*; D004121:Dimethyl Sulfoxide / Q000494:pharmacology; D004171:Diploidy; D005260:Female; D005306:Fertilization; D005434:Flow Cytometry; D005615:Freezing; D007552:Isotonic Solutions / Q000737:chemistry; D008297:Male; D009994:Osmolar Concentration; D010125:Ostreidae; D011003:Ploidies; D019946:Propylene Glycol / Q000737:chemistry; D012662:Semen Preservation / Q000379:methods; D013081:Sperm Motility; D013094:Spermatozoa / Q000166:cytology*; D013997:Time Factors
D003451:Cryoprotective Agents; C072670:Hanks Balanced Salt Solution; D007552:Isotonic Solutions; D019946:Propylene Glycol; D004121:Dimethyl Sulfoxide