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Induced diploid androgenesis is considered as a valuable tool for restoration of endangered or extinct species from cryopreserved spermatozoa. The method of dispermic androgenesis was developed in sturgeon fishes whose threatened status requires urgent conservation efforts. The method includes genetic inactivation of eggs, their insemination with concentrated sperm (to cause polyspermy), and the heat...
Some factors affecting the cryoresistance of common carp sperm have been studied. Concentration of oxygen in pond water and protein content in the diet of males have been shown to affect cryoresistance of sperm. Survival of frozen/thawed sperm obtained from males maintained for 3-14 days under both hypo- and hyperoxia was 30-50% less than that obtained from males maintained under normoxia. Compared...
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