魚礁における間伐材の特性と活用事例

概要

論文の詳細を見る
Recently, thinned trees are used in artificiai reefs in Japan but their effect on fish aggregation, increase of periphyton and their usefulness have not been studied. We researched utilization of the thinned tree reefs by a fieldwork and questionnaire survey. Ten thinned tree reefs and the normal reefs those are not using any tree, were placed on the frontage of Shimonoseki city in the depth of 12m and 34m November, 2002. The change of a shape of thinned trees, fish aggregation and the increase effect of periphyton were observed in 7-9 times a year for 3 years. The utilization of the artificial reefs with thinned trees were examined by questionnaire survey for 39 fishery bureaus of the metropolises and prefectures and for 39 companies producing artificial reefs in 2005. As a result, artificial reefs with thinned trees contributed to early increase of periphyton including marine borers, and superiority was recognized in fish aggregation compared with artificial reefs that do not install thinned trees. In addition, some useful knowledge are also reported for the utilization and the durability of thinned tree reefs.
2007-11-15