To provide a seaweed reef that can suppress predatory organisms from living around the sea reef when the seaweed reef is arranged on the bottom of the water. An algae growing member includes a growing block including a growing area for growing algae, and an algae growing net arranged so as to cover the growing area. A capture net that is disposed on the outer surface side of the algae-growing net 12 that is disposed on the water surface side when disposed on the inside and that forms a storage space that can accommodate a predatory organism that eats algae, and the predatory organism. And a capture member including an entry portion formed in the capture net so as to enter the accommodation space. [Selection] Figure 2【課題】藻場礁を水底に配置した際に、藻場礁周辺に捕食生物が住み着くのを抑制することができる藻場礁を提供する。【解決手段】藻類を育成するための育成領域を含む育成ブロック１１と、前記育成領域を覆うように配置された藻類育成用ネット１２とを備える藻類育成部材１と、前記藻類育成部材１が水底に配置された際に水面側に配置される前記藻類育成用ネット１２の外面側に配置され且つ藻類を食する捕食生物を収容可能な収容空間を内側に形成する捕獲ネットと、前記捕食生物を前記収容空間に進入させるように前記捕獲ネットに形成された進入部とを含む捕獲部材とを備える。【選択図】図２
