Zebrafish (Danio rerio) are an increasingly important model organism used in developmental biology, genetics, neurophysiology, neuroscience, behavioural neuroscience, and biomedicine as a whole. Zebrafish are applied as model organisms beyond this range of disciplines, but have for example been deployed in studies investigating anxiety, addictions, physiology and circadian rhythms, and learning and memory, to name a few. As a vertebrate, it brings the benefits of a vertebrate model to the table, combined with the practicalities enjoyed by many traditional non-vertebrate models, such as drosophila. The zebrafish remains small in size throughout its life, and has a short generation time. Making it useful for high throughput studies, yet also provide the benefits of a vertebrate system.