Examples of medaka inbred strains. (A) The HNI-II strain. Derived from a wild stock from Niigata. HNI-II belongs to the Northern Japanese Population. (B) The Hd-rR strain. Derived from the closed colony of d-rR strain, established by Yamamoto (1953, 1975). Hd-rR belongs to the Southern Japanese Population. (C) The Hi3 strain. Derived from the offspring of fish obtained from a stock (i3) mutant at Nagoya University. Hi3 also belongs to the Southern Japanese Population.