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
Bleeding heart tetra Bleeding heart tetra The bleeding heart tetra, "Hyphessobrycon erythrostigma", is a freshwater tropical fish native to the Upper Amazon River basin. It grows to the size of 64mm and lives for around five years. The female is more full bodied and the male has a larger dorsal fin. The male is distinguished by longer extended dorsal and anal fins. The dorsal fin is elongated into a sickle shape that arches to the length of the tail base. The female has a shorter rounded fin. This egg-laying fish has been bred successfully, with difficulty, in captivity. The dorsal fin of the