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The survey for the fish-breeding reef development confirmed un effect of reused rocky soils which were produced by the dredging construction in the sea road of the Hirado Seto. The survey were undertaken three times at Yoshizaemonse of the sea road and at Yokoshima offing from 2006 to 2007. The result of tidal-current surevy and water-quality survey showed the change of the tidal current which accompanies fish-breeding reef establishment. The three-times-divewatching observation showed the number of the species and individuals is increasing. Also, in the interview survey for the fisherman, it showed that fishery was already engaged at the fish-breeding reef establishment part. The construction technique was devised in the dredging part of the seabed, that is, it formed the unevenness (trench), and as a result it performs as the fish gathering effect and the biotope of the fish. But the definite effect could not be confirmed. However, a lot of commercial fish were confirmed by the dive watching observation and the interview survey, and it maintained a feature as the crude reef.

THE BUILDING WHICH ACCOMPANIES THE HIRADO SETO PASSAGE SERVICE AND THE VALID PROFIT UTILIZATION BY THE DETRITUS