This design is installed on the bottom of heavy and large rivers to prevent the bottom of the river from being washed down by the water, and the water flows down and hits the blocks and blocks, allowing the flow rate to flow slowly, and the fish inhabiting the upstream and downstream flows mutually. To facilitate this and to insert the wire or reinforcing through the through hole to prevent the loss of the block is developed for the fish block for the river.;The present invention has a plurality of areas on both sides of the adobe block body (1) made of the lower body (3) integrally formed so that the wide jaw (20, 21) is formed in front and rear of the upper body (2), respectively Make aerospace (4) (5) lower than the main body (1), and make a plurality of corrugated acid (6) to generate oxygen of the water, and make the inclined surface (7) (8) on both sides on one side of the aeroblock body (1) In the front of the sieve 3, grooves 10 and 11 are formed, and in the rear, key grooves 12 and 13 are made, respectively, through holes 14 and 15, respectively.
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