Fishes expressing a fluorescent protein in germ cells are useful to perform germ cell transfer experiments for conservation study. Nonetheless, no such fish has been generated in endangered endemic fishes. In this study, we tried to produce a fish expressing Venus fluorescent protein in germ cells using Honmoroko ( Gnathopogon caerulescens ), which is one of the threatened small cyprinid endemic to the ancient Lake Biwa in Jap...