Zebrafish their larval stages. In 2011, the British Heart Foundation ran an advertising campaign publicising its intention to study the applicability of this ability to humans, stating that it aimed to raise £50 million in research funding. Zebrafish have also been found to regenerate photoreceptor cells and retinal neurons following injury, which has been shown to be mediated by the dedifferentiation and proliferation of Müller glia. Researchers frequently amputate the dorsal and ventral tail fins and analyze their regrowth to test for mutations. It has been found that histone demethylation occurs at the site of the amputation, switching the zebrafish's cells
Four-eyed fish time at the surface of the water. Their diet mostly consists of terrestrial insects which are readily available at the surface, however they may consume other foods such as other invertebrates, diatoms, and small fishes. The fish will group differently depending on the species. "A. anableps" commonly congregates in schools. "A. microlepis" also is gregarious, but restricts its schools to about a dozen individuals; it is also recorded to be found singly or as couples. "A. anableps" is also known for the ability to survive out of water exposed to air, such as during low tide. Four-eyed fish The four-eyed