Abstract

ATENCIO-GARCIA, Víctor; CABRALES-HESSEN, Soad Samira  and  ESPINOSA-ARAUJO, José Alonso. Effect of ethylene glycol and milk powder in the cryopreservation of bocachico semen Prochilodus magdalenae. Rev. colomb. biotecnol [online]. 2021, vol.23, n.2, pp.25-35.  Epub Feb 18, 2022. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v23n2.91188.

Bocachico Prochilodus magdalenae is an endemic species and the most important of the Colombian continental fishery. Its catches have decreased by approximately 67% in the last forty years and, it has been categorized as extinction vulnerable. Semen cryopreservation is a biotechnological conservation tool; therefore, the aim of this study was to evaluate bocachico semen's cryopreservation with ethylene glycol (EG) and skimmed milk powder (LP). The cryoprotective solution was composed of EG (6, 8 or 10%), LP (3, 5 or 7%) and glucose at 6%. The quality of the thawed semen was evaluated with CASA software (computer assisted semen analysis). The inclusion percentage of EG did not significantly affect any of the evaluated semen quality parameters (p>0,05), except for the hatching rate (p <0.05). In contrast, LP presented significant effects on the percentage of static sperm (p <0,05) and on fertilization and hatching rates (p<0,01). The highest total motility was achieved with EG included at 10% and the LP 7% (38,4±18,4%) (p<0,05); but the highest fertility rates (54,3-64,2%) and hatching (47,7-57,5%) were registered when EG included at 6 or 8% and LP included at the lowest rate evaluated (3%), no significant difference was observed between these treatments (p>0,05). The results allow us to conclude that the combination EG 6% with LP 3% allows the cryopreservation of Prochilodus magdalenae semen of good quality and fertilizing capacity.

Keywords : conservation; cryoprotectants; neotropical fishes; reproduction; spermatozoa.

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