Why zebra fish experience similar genetic disease as human

Zebra fish is used as an experimental animal model to investigate the genetic cause of human diseases. It is a fresh-water fish found in rivers and ponds of India. There is no similarity in appearance between zebra fish and humans but actually 70% of genes are similar in humans and in zebra fish. Many genes act in the same way in both the organisms in the development of features such as mouth, eyes, brain spinal cord, liver pancreas. Therefore, any disease causes change in body parts of human may experience similar genetic disease in zebra fish.