| Project/Area Number |
05405006
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
広領域
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| Research Institution | Faculty of Agricultre, Kinki University (1994-1995)
Kagoshima University (1993) |
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Principal Investigator |
HIRATA Hachiro Kinki University, Professor, 農学部, 教授 (90041714)
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| Co-Investigator(Kenkyū-buntansha) |
YAMASAKI Shigehisa Kagoshima Univ., Assist.Prof., 水産学部, 助教授 (50117553)
ISHIBASHI Yasunoro Kinki Univ., Research Assist., 農学部, 助手 (90247966)
御木 英昌 鹿児島大学, 水産学部, 教授 (40041727)
田中 淑人 鹿児島大学, 水産学部, 助教授 (50041728)
今井 健彦 鹿児島大学, 水産学部, 教授 (20041709)
中村 薫 鹿児島大学, 水産学部, 助教授 (40041719)
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| Project Period (FY) |
1993 – 1995
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| Project Status |
Completed (Fiscal Year 1995)
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| Budget Amount *help |
¥21,100,000 (Direct Cost: ¥21,100,000)
Fiscal Year 1995: ¥5,000,000 (Direct Cost: ¥5,000,000)
Fiscal Year 1994: ¥6,000,000 (Direct Cost: ¥6,000,000)
Fiscal Year 1993: ¥10,100,000 (Direct Cost: ¥10,100,000)
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| Keywords | Polyculture / Sustainalbe / Seaweeds / Chlorophyta / Red sea bream / Carbon dioxide / Dissolved oxygen / Recycled feeding / 循環調和養殖 / 藻類増殖能 / 物質循環 / 複合養殖 / Nannochloropsis / Ulva / マダイ / 生態系 / pCO_2(二酸化炭素分圧) / pO_2(酸素分圧) / 環境条件 / 相対収支 / アナアオサ変異種 / アナアオサ / 不稔性 / CO_2・O_2比 / 植物・動物比 / 脂肪酸組成 / 窒素排泄 / 窒素吸収 / 環境浄化 |
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| Research Abstract |
Polyculture of fish and seaweeds is a benefical system in aquaculture. In spite of its importance from the ecological point of view, little attention has been given in polyculture system. This may be due to the fact that fish and seaweeds have different growth seasons ; fish grow in summer nd autum while seaweeds propagate in winter and spring. Previously, we found the culture techniques of sterile Ulva pertusa which grow in summer and autum as same seasons as fish growth. In the presesnt study, we have examined the polyculture of fish and seaweed, sterile Ulva pertusa.
The first experiment was conducted in the fish cage culture farm from August 1993 to February 1994 at the Azumacho Fish Seedling Center. Two cages, 7x7x7m, were employed, one for polyculture experiment and the other one for control experiment by the routine method. Three years old red sea bream Pagrus major, about 1750 individuals each, were cultured in each cage. The Chlorophyta, steriled Ulva pertusa was cultured by th
… More
e floating net system in the experimental cage. Dissolved oxygen and carbon dioxide were measured by Radiometer ABL-330.
Considering the value of pO2 in the control cage as 100%, pO2 in the experiment cge stands 109.1%. On the other hand, average pCO2 in the control cage as 100%, pCO2 in the experiment cage stands 96.1%. From the results mentioned above, it may concluded that the pCO2 in the experimental cage decreased to 4% while pO2 augmented up to 9% compared to those in the control cage.
The second experiment was also conducted in order to know the efficiences of light intensity and water temperture on growth of sterile Ulva pertusa as a foundamental study of "harmonized fish culture with environment" where substances were recycled through the alga. Tendency of low light and high light intensities were observed around the winter solstice and summer solstice, respectively. The highest value was 19.7 mol/m2/day around the winter silstice and 47.3 mol/m2/day around the summer solstice. In multiple regression analysis, multiple regression coefficient of 0.74 was obtained. Less
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