| Project/Area Number |
10460143
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| Research Category |
Grant-in-Aid for Scientific Research (B).
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
生物資源科学
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| Research Institution | TOKYO UNIVERSITY OF FISHERIES |
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Principal Investigator |
TAKEUCHI Toshio PROFESSOR, FACULTY OF FISHERIES, TOKYO UNIVERSITY OF FISHERIES, 水産学部, 教授 (70092591)
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| Co-Investigator(Kenkyū-buntansha) |
SATOH Shuichi ASSOCIATE PROFESSOR, GRADUATE SCHOOL OF AQUATIC BIOSCIENCES, TOKYO UNIVERSITY OF FISHERIES, 水産学部, 助教授 (80154053)
SAKAI Kiyoshi ASSOCIATE PROFESSOR, FACULTY OF FISHERIES, TOKYO UNIVERSITY OF FISHERIES, 水産学部, 助教授 (70017060)
KITAYA Yoshiaki ASSOCIATE PROFESSOR, GRADUATE SCHOOL OF AGRICULTURAL SCIENCES, TOKYO UNIVERSITY OF FISHERIES, 大学院・農学生命科学研究科, 助教授 (60169886)
YOSHIZAKI Goro ASSISTANT PROFESSOR, FACILTY OF FISHERIES, TOKYO UNIVERSITY OF FISHERIES, 水産学部, 助手 (70281003)
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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥12,500,000 (Direct Cost: ¥12,500,000)
Fiscal Year 2000: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 1999: ¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1998: ¥6,300,000 (Direct Cost: ¥6,300,000)
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| Keywords | CLOSED ECOLOGY / CUITURE SYSTEM / RECIRCULATING / TILAPIA / MICROALGAE / ZOOPLANKTON / LIGHT CIRCULATION / 窒素 / リン / スピルリナ / 水質 / 循環3過 / ユーグレナ / システム / 飼育 / CELSS |
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| Research Abstract |
A closed ecological recirculating aquaculture system(CERAS), a part of the models of a controlled ecological life support system(CELSS), was developed in the hydrosphere for aquatic organisms such as phytoplankton, zooplankton and fish. Using a fish-rearing closed tank(air-tight tanks)with an O_2/CO_2 exchange unit, the influence of different photoperiod cycles(3L : 3D ; 6L : 6D ; 12L : 12D ; ＆ 24L : 24D)on the metabolic rate and energy loss of young and adult tilapia Oreochromis niloticus was investigated. This study suggested that energy conservation would be possible if this fish is exposed to longer cycles of photoperiod rather that shorter ones. Resting respiratory rate of young tilapia was higher than that of adult one. In this closed system, tilapia showed normal growth and high feed efficiency compared with the recirculating open tank under a high concentration of NO_3-N over the 189-day period. Phosphorus form and mineral budgets in the fish-rearing closed tank during a long term experiment with tilapia were also evaluated. Several elements in the wastes require ionization and /or supplement, to serve as nutrients for alga in closed culture systems. Tilapia can be cultured only Spirulina platensis from larvae to adult. This results suggest that it is feasible to construct a food chain using raw Spirulina to feed tilapia from the onset of exogenous feeding in a CERAS.Finally, the effects of CO_2 and O_2 concentrations and light intensity on growth of microalgae Euglena gracilis were investigated. The multiplication rate of cells was highest and the cell number increased by 8.3 times during 48h under a condition of 4% CO_<>, 21% O_2 and 100μ moll m^<-2>s^<-1> PPF.This study obtained many basic and useful informations to develop CERAS.
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