Marine Afforestation of Large Alga (Laminaria and Sargassum) in off the Coast of the Sea of Japan, Hokkaido, Japan
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Accession number;06A0177344
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| Title;Marine Afforestation of Large Alga (Laminaria and Sargassum) in off the Coast of the Sea of Japan, Hokkaido, Japan |
| Author;
KAWAI TADASHI
(Nucl. Energy Environ. Res. Center, Hokkaido Prefect. Gov.)
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Journal Title;Fisheries Engineering
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Journal Code:F0449B
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ISSN:0916-7617
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VOL.42;NO.3;PAGE.219-224(2006)
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| Figure&Table&Reference;FIG.10, REF.18 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Barren ground exists off the coast of the sea of Japan, Hokkaido, Japan. In this area, the sea urchin (Strongylocentrotus nudus) dominates, and distribution of large algae (Laminaria religiosa and Sargassum confusum) is limited at shallow area. For marine afforestation of two large algae, control of grazing pressure is important. The sea urchins were removed from barren ground at Otaru, Hokkaido, from 1998 to 2000. The L. religiosa occurred on the area, but this biomass depends on water temperature during winter. There is a relationship between the water temperature and concentration of nitrate. To clear the mean and range of concentration of nitrate in fisheries ground, its yearly change in Tomari, Hokkaido, was analyzed. In order to examine the effects of nitrate for growth of the gametophyte of L. religiosa, it was cultured under laboratory condition. Based on the analyze of nitrate in Tomari, concentration of nitrate was ranged from 0 to 6.MU.M. Cell number of gametophytes increased at more than 4.MU.M. Growth of gametophyte of L. religiosa was affected by concentration of nitrate under laboratory condition. Reproductive cycle of S. confusum was observed in Suttu, Hokkaido. The sea urchins were fished before the fruiting season, then biomass of S. confusum promptly increased. By managing of fishing season of the sea urchins, the S. confusum population is able to maintain sustain productive fisheries ground. (author abst.) |
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