Optimizing Sperm Collection Procedures in Zebrafish

Area of Science:

• Developmental Biology
• Aquaculture
• Genetics

Background:

• Zebrafish are crucial model organisms in developmental biology.
• Maintaining zebrafish lines is resource-intensive, necessitating sperm cryopreservation for long-term storage.
• Existing in vitro fertilization protocols show high variability, risking line loss.

Purpose of the Study:

• To optimize zebrafish sperm collection protocols for improved ejaculate quality.
• To identify factors influencing the success of sperm collection in zebrafish.

Main Methods:

• Males were housed individually or in groups prior to sperm collection.
• Ejaculate quality was assessed based on sample volume and sperm motility.
• The impact of male age (17-68 weeks) and genetic background (5D vs. AB lines) was evaluated.

Main Results:

• Individual housing of males significantly increased the proportion of quality ejaculate.
• Ejaculate quality did not correlate with male age within the tested range.
• AB zebrafish lines produced significantly higher quality ejaculate compared to 5D lines.

Conclusions:

• Separating male zebrafish before collection is recommended to enhance sample success.
• AB lines are superior for sperm banking due to higher ejaculate quality.
• Age is not a limiting factor for sperm collection in adult zebrafish (17-68 weeks).