An object of the present invention in discharge of fry that are artificial growth has been carried out in Japan coastal waters , effluent has been fry is not diffuse to facilitate early stays inside and easily infiltrate the inside , it is possible to prevent the internal intrusion of large predatory fish , diet provides a feeding area superior fry the biological productivity and is compact in manufacturing easy that can be protected and development to time to less susceptible to predation damage to habituate to the environment , further stability in the waters , sinking I provide excellent protection fry rearing reef in workability . And A Sakanasu section 15 block body 16 is disposed in a frame shape on a habitation shelf having a bottom portion and a parallel Sakanasuana 16a that outside the opening of the internal building frame 7 , is surrounded by Sakanasu part inhabiting I have a , a food growth portion 17 which is formed on the shelf . [ Selection Figure Figure 5【課題】日本沿岸海域で行われている人工増殖された稚魚の放流において、放流された稚魚が内部に潜入し易く且つ内部に留まり易く早期に拡散せず、大型捕食魚の内部侵入を防止し、餌料生物生産性に優れた稚魚の餌場を提供し、自然環境へ慣れさせ食害被害を受け難い時期まで保護及び育成することのできるコンパクトで製作も容易であり、更に海域での安定性、沈設作業性に優れた稚魚保護育成礁を提供する。【解決手段】内部躯体7の底部と平行で外部に開口した魚巣穴16aを有するブロック体16が棲息棚上に枠状に配設された魚巣部15と、魚巣部に囲まれ棲息棚上に形成された餌料増殖部17と、を備えている。【選択図】図5
