Zebrafish are extremely useful in the research and study of human diseases. To understand how and why scientists use zebrafish for neural disorders research please see the below links:
Why is the zebrafish useful to address human disorders?
Take a look at how the brain ‘fires’ its neurons from Jenny Freeman Janelia Farms.
How a Transparent Fish May Help Decode the Brain
For the first time, Florian Engert and his team mapped every firing neuron in a living animal.