Then, the estimation of fish production in the new fishing ground using above ratio is;
60K*1.2 = 72,000 (ton/year)
= 200 (ton/day)
And assuming the price of fish is US$2.00/kg, the estimation of income is;
2.00*72,000*103 = 144,000,000 (US$/year)
The summary of the above study is shown in table 2.
The recent total amount of catching fishes in the world is less than 100 million tons. If we made 1,000 ultimate machine and operate in the equatorial ocean, 72 K*1,000 = 72 million (ton/year) fishes which are almost same amount of total catching fishes in the world is expected to be produced.
7. CONCLUSIONS
The conclusions of this paper are listed below.
1) Proposition of the concept design for the DOW upwelling machine which changes "the sea of desert" into "the rich fishing ground" was made.
2) The density current generator which is the origin of the DOW upwelling machine was introduced.
3) Outline particulars and specifications of the machine are established and general issue for key technologies such as density current diffusion, OTEC, stability of the machine, etc. was discussed.
4) From the feasibility study of the machine, it is known that the ultimate size machine can products fishes of 72,000ton/year, considering certain assumptions. This is very significant impact on the ocean environment.
ACKNOWLEDGEMENT
The research and development work regarding the density current generator stated in chapter 3 and 4 was strongly supported by MARlNO-FORUM 21. The authors would like to thank deeply for them.
REFERENCES
1)K. Ouchi, T. Yamatogi, K. Kobayashi, M. Nakamura: Research and Development of Density Current Generator, Journal of the Society of Naval Architects of Japan Vol.183, 1998.6.
2) K. Ouchi, T. Yamatogi, K. Kobayashi, M. Nakamura: Density Current Generator - A New Concept Machine for Agitating and Upwelling a Stratified Water Area - , Proceedings of Ocean Community Conference '98 Baltimore USA, 1998.11.
3) Y Nozaki: Global Warming and the Oceans - The Role of Carbon Cycling -, University of Tokyo Press, 1993 .
4) Berger et al: Productivity and Organic Carbon Flux Part 1, University of California San Diego SIO, 1987.
5) John Ryther: Photosynthesis and Fish Production in the Sea, Science Vol.166, 1969.
