PROBLEM TO BE SOLVED: To provide a method capable of multiplying corals by a simple and reliable method. SOLUTION: This is a method of multiplying corals 3, in which iron or a material containing iron is hammered into the seabed 1 or is adhered or weighted with a stone or the like and fixed. Specifically, as the iron or iron-containing material, nails, male screws, bolts, reinforcing bars, iron piles or iron wire nets are used and driven into the seabed 1 or screwed or bonded to rocks or bedrock of the seabed 1. Fix with stones or stones or rocks. If the coral 3 is easily attracted by exposing the iron part of the above material, the coral 3 can surely propagate. To expose the iron part, grind it with a grinder, scratch it with a blade, or make a score with a gold saw. It is also possible to construct artificial fishing reefs by submerging an iron three-dimensional structure on the seabed. [Selection diagram] Figure 1【課題】簡便確実な方法でサンゴを増殖できる方法を提供する。【解決手段】サンゴ３の増殖方法であって、鉄又は鉄を含む素材を海底１に打ち込むか又は接着し又は石などで重しをして固定する。具体的には、前記の鉄又は鉄を含む素材として、釘、雄ネジ、ボルト、鉄筋、鉄杭又は鉄製の金網を用い、海底１に打ち込むか又は海底１の岩や岩盤に螺入又は接着し又は石や岩で重しをして固定する。前記の素材の鉄部を露出させてサンゴ３が誘引され易くすると、確実に増殖できる。鉄部を露出させるには、グラインダーで研磨したり、タカネで傷付けたり、金鋸で切り目を入れたりする。なお、鉄製の立体構造物を海底に沈めると、人工漁礁も可能となる。【選択図】図１
