<調査報告>北海道羽幌町における魚礁設置海域の調査 : そのI.海藻について

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Algal composition and growth were examined on the algae attached to newly designed artificial fish reefs off Haboro, on Japan Sea side of Hokkaido, Japan. The artificial fish reef is square, 2 m x 2 m x 2 m in dimension. The base is concrete on which pine trees stand as four-sided fences. The inside of the fence is filled with blocks of andesites and zeorites. These artificial reefs are expected to attach algae and foster phytoplankton and zooplankton. The fish reefs were placed on the 3 m depth and 15 m depth sandy beach on November 29,1988. No algae were found on the reefs on January 13,1989,despite the finding of a total of 22 algae species on beach. Laminaria spp. and Ulva pertusa were observed on the reefs on March 21,1989. On June 3,7 months after the placement, Laminaria spp. of 15-16 cm in length were on the surface of andesites from the depth of 3 m. The blade width and weight relationships of Laminaria. spp. indicate the growth was good, despite the low nutrient concenration of sea water in the Japan Sea in early summer.
1990-03-20