Aquatic Advancements: Refining and Validating a Zebrafish Survival Blood Collection Technique

Area of Science:

• * Zebrafish (Danio rerio) model organism research
• * Preclinical research and drug discovery

Background:

• * Zebrafish are crucial for studying vertebrate development, diseases, and toxicology.
• * Nonlethal, repeatable blood sampling is essential for longitudinal zebrafish studies but remains challenging due to species-specific factors.
• * Standardized survival blood collection protocols for zebrafish are underdeveloped.

Purpose of the Study:

• * To refine and validate a survival blood collection methodology for zebrafish.
• * To establish a protocol for repeatable, nonlethal blood sampling over four weeks.
• * To assess the impact of repeated blood collection on zebrafish health and well-being.

Main Methods:

• * Utilized the dorsal aorta as the vascular access site in anesthetized zebrafish.
• * Employed precisely crafted glass pipettes for microscale blood draws and safe capillary collection techniques.
• * Conducted weekly blood collections for up to four weeks, evaluating both male and female fish.

Main Results:

• * Repeated blood collection (up to 4 draws) showed no significant histopathological tissue differences.
• * Hemoglobin levels decreased proportionally to blood collection volume.
• * Behavioral and clinical assessments indicated no observable detriment, even at higher blood volumes.

Conclusions:

• * A validated, standardized survival blood collection technique for zebrafish was established.
• * Repeated weekly blood sampling for up to four weeks is feasible without compromising fish welfare.
• * This method enhances the utility of zebrafish in preclinical research by enabling longitudinal studies.