Cryopreservation of yellowfin seabream (Acanthopagrus latus) spermatozoa (Teleost, Perciformes, Sparidae).

The effects of both osmolality and cation in the initiation of sperm motility were examined in yellowfin seabream, Acanthopagrus latus. Various factors involved in the cryopreservation of yellowfin seabream spermatozoa on motility are discussed. Extender containing only glucose proved to be a suitable medium for freezing yellowfin seabream spermatozoa to -196 degrees C. Glycerol seems to have a direct osmotic effect on yellowfin seabream sperm cells, and it induced sperm motility before freezing and during thawing. However, this exhausted the energy needed for sperm motility for fertilization. Dimethyl sulfoxide (DMSO) proved superior to ethylene glycerol, propylene glycerol, glycerol and methanol as a cryoprotectant. Prolonged equilibration time had a detrimental effect on both prefreezing and post-thawing sperm motility. The estimated optimum freezing rate was in the range of -20 to -154 degrees C/min. More frozen-thawed than fresh spermatozoa are required to achieve comparable fertilization rates.

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