Genetic Similarity of the Hainan Medaka Populations Collected from Hyper- and Hypo-osmotic Environments in Northern Vietnam

Abstract

Ricefishes of the genus Oryzias, including Japanese medaka (O. latipes), are known as excellent model organisms for studies in various fields of science. Some species of the genus inhabit brackish water, and such species are recognized to be useful to investigate physiological phenomena in seawater. However, only a limited number of species have been recorded from brackish waters. In addition, there is no information about the genetic relationship among populations inhabiting sites with different salinities.