Introduction: Development
This is the process by which a single cell, usually a fertilized egg, becomes a multi-celled organism. It involves the division of cells by mitosis and their differentiation into specialized cells, tissues, and organs.
Zebrafish development
This film depicts zebrafish (Danio rerio) development from the single-cell stage to hatching.

Elapsed time about 48 hours.
Fertilized zebrafish eggs were mounted in fresh water between a slide and coverslip using a silicon rubber spacer. Images were taken at room temperature on an inverted compound microscope using a 10x DIC objective and digital camera.