PROBLEM TO BE SOLVED: To construct the revetment as a man-made fish-gathering place along the curve of a river by providing a block for man-made fish-gathering place, which is used for constructing a man-made fish-gathering revetment, with a protrusion/recess engaging surface the angle of which is freely adjustable with respect to a neighboring block. SOLUTION: An approximately rectangular parallelopiped-shaped fish-gathering block 1 has fish way holes 3, 4, 4a communicating with fish-gathering holes 2 formed in fronts formed in left and right side faces and upper and lower surfaces, and recessed surfaces 5a and protruding surface 6a capable of being engaged with each other at an arbitary angle are shaped at the side ends of protruding sections 5, 6 formed at both left and right ends on the front sides. The recessed surfaces 5a and protruding surfaces 6a of the blocks 1 are engaged with each other and arranged adjacently to one another on a concrete foundation built in conformity with the curve of a revetment, both ends of flexible pipes 9 are inserted and connected to opposed fish way holes 3, 3 and the blocks 1 are piled up, clearances among the blocks 1 are filled with cast-in-place concrete 10, and blocks 1 are integrated, and an uppermost stage is covered with coping blocks. Accordingly, the revetment of the man-made fish-gathering place, in which the fish way holes 3, 4, 4a communicate in all directions can be constructed easily in conformity with the curve of a river.
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