<論文>羽幌町沿岸に設置した改良型HS-ブロック上のコンブについて

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HS-blocks, which have been used as an artificial fish reefs at Haboro and Okinawa and algae reefs at Haboro, Teuri Island and Yagisiri Island, were born in 1988 at Haboro Hokkaido Japan. They were made of lots of pine trees. Trees have been damaged by shipworms in the sea. So we need to exchange some design of them. Fifteen newly designed HS-blocks were placed at 3-5 m depth off Uaboro beaches on December first 1992. They were covered with one year old Laminaria japonica var. ochotensis on June 24 1993. On June 16 and 20 1994,the growth rate of L. ochotensis were surveyed. The fronds on the blocks were found two year and one year old L. ochotensis. The growth rate of two-year old fronds, which measured blade length, blade width and blade wet weight, looked like about natural reef's ones. At this time of year, the mean value of the substantiality value, which indicated the growth rate of Lan'iinaria sp. was about 90. The newly desiened HS-block proved to be the same functions as old ones.
1995-03-25