Study on effect of wooden reefs in coastal waters off Yamaguchi prefecture [Japan], southwestern Japan Sea, 1: Effect and life span of wooden reefs in waters off Utago, Yamaguchi prefecture
2004
Kawano, M. (Yamaguchi-ken. Fisheries Research Center, Nagato (Japan)) | Watanabe, T. | Yoshioka, S. | Shigenaga, Y.
Wooden Reefs were firstly set in waters off Utago. Yamaguchi Prefecture in April 1996. We conducted ROV observations and angling surveys during the period of 1996-2002 in order to elucidate effect and life span of the reefs. Marine burrowers (Teredo navalis, Limnoria sp. and Chelura sp.) burrowed and damaged the reefs and some of the reefs disappeared in July 2002. So the life span of the reefs were estimated at 5-6 years. The number of gathering fish species increased year by year and became 22 species in 2001. Angling surveys showed that catch per unit effort of the wooden reefs was not smaller than that of adjacent concrete reefs.
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