PURPOSE: To form a revetment permitting the inhabitation of fish by a method in which a V-shaped stay is integrally formed on the lower sides of the back of a rhombic front face to form a sheathing and also a space as an inhabitat for fish.

CONSTITUTION: A fish bank block A has a V-shaped stay 7 integrally formed on the back lower sides of its rhombic front face 6, and a vegetating block B has a V-shaped slant wall 2 integrally formed on the back lower sides of the rhombic front face 1 and also an inversed triangular hole formed at the central part of the back wall 3. A top block C is of a bent plate form with a V-shaped longitudinal section. In forming a revetment, the blocks A are set from the lower stage by inversing its back and front sides to form the front face 6 as sheating, the block A is further set on the block, the block B is set on the block A, and the block C is set on the uppermost stage.