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Updated: Dec 11, 2025
Cryopreservation of Zebrafish Spermatogonia by Whole Testes Needle Immersed Ultra-Rapid Cooling
Published on: March 4, 2018
Morphological abnormalities in zebrafish cryopreserved sperm
Bruna Bitencourt da Costa1, Diogo Losh de Oliveira2, Rômulo Batista Rodrigues1
1Aquam Research Group, Animal Science Research Program, Universidade Federal do Rio Grande do Sul, UFRGS, Brazil.
Abstract:
The aim of the present study was to evaluate the effect of cryopreservation on the morphology of zebrafish sperm (Danio rerio). Sperm from 30 males were collected and divided in two treatments: fresh and cryopreserved semen. The following were measured sperm morphology, motility and membrane integrity. Cryopreservation reduced motility, the number of normal cells and the membrane integrity, as well as increased the percentage of sperm abnormalities. The most frequent types of morphological changes found in cryopreserved semen were macrocephaly, loose head, degenerated head, proximal gout, curled tail and short tail. This study opens the way for further investigations on morphological changes and for a new classification of these changes in fish semen due to cryopreservation.
Insights
Cryopreservation negatively impacts zebrafish sperm (Danio rerio) quality, reducing motility and membrane integrity while increasing abnormalities. This research highlights specific morphological defects caused by cryopreservation in fish sperm.
Area of Science:
- Aquatic biology
- Reproductive biology
- Cryobiology
Background:
- Cryopreservation is vital for preserving genetic material in fish aquaculture.
- Understanding cryopreservation's effects on sperm morphology is crucial for successful artificial reproduction.
Purpose of the Study:
- To assess the impact of cryopreservation on zebrafish (Danio rerio) sperm morphology, motility, and membrane integrity.
Main Methods:
- Sperm from 30 male zebrafish were analyzed in fresh and cryopreserved states.
- Evaluated parameters included sperm morphology, motility, and membrane integrity.
Main Results:
- Cryopreservation significantly decreased sperm motility and membrane integrity.
- An increase in sperm abnormalities, including macrocephaly and tail defects, was observed post-cryopreservation.
Conclusions:
- Cryopreservation induces detrimental morphological changes in zebrafish sperm.
- Further research is needed to classify these cryopreservation-induced changes in fish semen.
