PROBLEM TO BE SOLVED: To provide a breeding reef for growing seaweed on a columnar member standing in the sea. SOLUTION: A breeding reef 1 having a base 10, a seaweed basin formed on the base 10 and a corrosion prevention net 60 for preventing fish from entering the seaweed basin, which is submerged in the sea to proliferate seaweed. It is. The breeding reef 1 includes a columnar member 20 erected on the upper surface of the base 10, an upper holding member 30 that is fixed to the upper part of the columnar member 20 and holds the anticorrosion net 60 above the columnar member 20, and the columnar member 20. A side holding member 40 that holds the anticorrosion net 60 so that the anticorrosion net 60 is separated from the side of the columnar member 20, and a fastening for fastening the lower end of the anticorrosion net 60 to the surface of the base 10. And a tool 50. [Selection] Figure 1【課題】海中で立設させた柱状部材に海藻を増殖させる増殖礁を提供する。【解決手段】基台１０と、基台１０に形成される藻場と、藻場への魚類の侵入を防止する防食ネット６０と、を有し、海中に沈めて海藻を増殖させる増殖礁１である。増殖礁１は、基台１０の上面に立設された柱状部材２０と、柱状部材２０の上部に固定され柱状部材２０の上方にて防食ネット６０を保持する上方保持部材３０と、柱状部材２０の側部に固定され柱状部材２０の側方に防食ネット６０が離間するように防食ネット６０を保持する側方保持部材４０と、防食ネット６０の下端を基台１０の表面に留めるための留め具５０と、を有する。【選択図】図１
