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.
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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.