45 reactions · 14 shares | Zebrafish grow at an extremely fast rate, developing as much in a day as a human embryo develops in one month. For context, a fertilized zebrafish egg develops and hatches within 48 hours. https://bit.ly/3HjqU1A The first 22 hours of zebrafish development (blood vessels shown in green) Daniel Castranova Dr. Brant M. Weinstein National Institutes of Health (NIH) NICHD Bethesda, Maryland, USA Confocal 4X (Objective Lens Magnification) | Nikon Small World | Facebook