alexa A simple, inexpensive and successful freezing method for curimba Prochilodus lineatus (Characiformes) semen.
Reproductive Medicine

Reproductive Medicine

Journal of Fertilization: In Vitro - IVF-Worldwide, Reproductive Medicine, Genetics & Stem Cell Biology

Author(s): Viveiros AT, Orfo LH, Maria AN, Allaman IB

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Abstract The cryopreservation of fish sperm provides a tool by which reproduction is optimized and thereby larval production is increased. The aims of this study were to evaluate the effects of cryosolutions, motility-activation media, straw volumes and thawing temperatures on the post-thaw motility of curimba semen. Furthermore, semen cryopreserved in a simple and inexpensive cryosolution and that yielded excellent post-thaw motility was tested for fertility. Semen was diluted in each of the eight cryosolutions in a factorial of two cryoprotectants (DMSO and methylglycol) x four extenders (0.9\% NaCl, 5\% glucose, BTS and M III). Diluted semen was frozen in 0.5-mL straws in a nitrogen vapor vessel. Sperm motility was evaluated after thawing (60 degrees C water bath for 8s) and activation with a total of four different activation media (distilled water, 0.15\% NaCl, 0.29\% NaCl or 1\% NaHCO(3)). To evaluate straw volume and thawing temperature, semen was diluted in 5\% glucose and methylglycol and frozen in 0.5- and 4.0-mL straws. Half of the 0.5-mL straws were thawed in a water bath at 60 degrees C for 8s and the other half at 30 degrees C for 16s. The 4.0-mL straws were thawed at 60 degrees C for 24s only. In the last experiment, semen cryopreserved in 5\% glucose and methylglycol, 0.5-mL straws, and thawed at 60 degrees C for 8s was tested for fertility. The results of these comparisons are presented and show that curimba semen can be successfully cryopreserved in a simple glucose solution combined with methylglycol as cryoprotectant, in 0.5-mL straws, yielding motility rates between 86\% and 95\% and fertilization rates between 47\% and 83\%. This article was published in Anim Reprod Sci and referenced in Journal of Fertilization: In Vitro - IVF-Worldwide, Reproductive Medicine, Genetics & Stem Cell Biology

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