Twenty years ago, Japan had already started proceeding with artificial propagation and repopulation of gradually disappearing fireflies. In particular, the originally numerous Luciola cruciata and L. Latoralis have been specially protected in a few stretches of river with strict controls on water quality.
廿年前，日本已開始針對日漸稀少的螢火蟲進行人工繁殖與復育，尤其原本數量繁多的平家螢、源氏螢，更被特意保護在嚴格控制水質的幾個河段裡。