PROBLEM TO BE SOLVED: To provide a growth bank for sea cucumbers which allows sea cucumber larvae freely swimming under the sea to easily settle and allows young sea cucumbers developed from the larvae to safely inhabit, and which has excellent durability and strength and is easily maintained.SOLUTION: A bottomed cylindrical growth bank 10 for acquiring and growing sea cucumber larvae freely swimming under the sea includes: a lower structure 14 of which inner space is filled with stones S； an upper structure 11 which has a framed structure including posts 12 and beams 13 and is placed on the lower structure 14； gratings 17, 18, and 19 which respectively covers openings 20, 21, and 22 provided in peripheral walls 15 of the lower structure 14 and in the side surfaces and top surface of the upper structure 11. The gratings 18 mounted in the side surfaces of the upper structure 11 serve as larva acquisition parts for acquiring sea cucumber larvae freely swimming under the sea, and the lower structure 14 of which inner space is filled with stones S serves as a young sea cucumber growing part for growing young sea cucumbers developed from the larvae.【課題】海中を浮遊しているナマコの幼生が着生しやすく、且つ幼生から成長した稚ナマコの安全な棲息場となると共に、耐久性と強度に優れメンテナンスが容易なナマコ増殖礁を提供する。【解決手段】海中を浮遊しているナマコの幼生を捕捉して育成するナマコ増殖礁１０であって、有底筒状体からなり、内部空間に石Ｓが積み付けられた下部構造体１４と、柱１２及び梁１３から構成される骨組構造からなり、下部構造体１４上に配置された上部構造体１１と、下部構造体１４の周壁１５並びに上部構造体１１の側面及び天面に設けられた開口２０、２１、２２をそれぞれ覆うグレーチング１７、１８、１９とを備え、上部構造体１１の側面に取り付けられたグレーチング１８が、海中を浮遊しているナマコの幼生を捕捉する幼生捕捉部とされ、内部空間に石Ｓが積み付けられた下部構造体１４が、幼生から稚ナマコに成長したナマコを育成する稚ナマコ育成部とされている。【選択図】図２
