PROBLEM TO BE SOLVED: To provide a new technology for an artificial sea bottom settling bank capable of securing a resting space in shadow in a fish bank, gathering and inhabiting echinoderms with high density, and safely and effectively capturing the echinoderms by prompt underwater work.SOLUTION: An artificial bottom settling bank 1 is configured such that the lifting lugs 72 are provided in a plurality of places of an upper surface 71 in a top surface opening 43 of a protective wall 4 after the protective wall 4 securing a protection space 42 having a water passing part 41 in the center of an upper surface 20 of an anchor base 2 is installed and fixed, shelf plates 81 for settling a target organism at a bottom with vertically multiple stages are provided in a lower surface 73, a top cover 7 integrated with depending shelves 8 set in an outline shape capable of being accommodated in the protection space 42 in the protective wall 4 in a suspending manner is detachably covered, and the depending shelves 8 are capable of being accommodated and protected in the protection space 42 in the protective wall 4 between the upper surface 20 of the anchor base 2 and the lower surface 73 of the top cover 7 in the covered state.【課題】 魚礁内に陰影で安息な空間を確保すると共に、棘皮動物類を高密度に集合、生息可能であって、しかも迅速な水中作業にて安全且つ効率的に捕獲可能とすることができる新たな人工漁礁技術を提供する。【解決手段】 アンカーベース２の上面２０中央に、通水部４１を有する養護空間４２を確保した防護壁４を搭載・固定した上、該防護壁４の天面開口部４３には、上面７１複数箇所に吊り金具７２，７２，……を配すると供に、下面７３に、上下複数段の捕獲対象生物着底用棚板８１，８１，……を有し、当該防護壁４内養護空間４２に収容可能な外郭形状に設定した依拠棚８，８，……を吊下状に一体化してなる天蓋７を離脱自在に施蓋し、その施蓋状態にて該依拠棚８，８，……をアンカーベース２上面２０、天蓋７下面７３間の防護壁４内養護空間４２に収容、養護可能なものとしてなる人工着底礁１である。【選択図】 図１４
