Ultrastructural study of the esophagus and stomach of Arapaima gigas (Schinz 1822), juvenile paiche, created excavated tank. Acta Scientiarum. Biological Sciences, [S. l.], v. 44, n. 1, p. e58699, 2022. DOI: 10.4025/actascibiolsci.v44i1.58699. Disponível em: https://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/58699. Acesso em: 7 jun. 2026.