The present paper deals with the consideration for the safety on human life in the CELSS.

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Nutritional problems on the food production, cooking, and processing in CELSS have been studied. The technology of CELSS is supposed to utilize in space. However, there are differences in the metabolism of nutrients in human body between the earth and space. Foods contained abundantly useful lipids for cardiovascular function, calcium, and vitamin D must be produced in space. To achieve this object, it is especially needed to enrich sea foods in the production. We tried to produce a processed foodstuff of young tilapia (average length: 5cm) which was a freshwater fish and easy to breed. The processed fish showed a good nutritional balance. It may be useful for a long-term staying in CELSS or space.

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Throughout human history, philosophers have puzzled over the existence of “mind, ” “soul, ” and “spirit. ” In our age of science and technology, biochemistry and neuroscience have been limelighted in the study of brain function, providing us a better understanding of the mechanisms of consciousness and the human mind. The author describes mainly that (1) mental activity is controlled by the state of consciousness, especially when one lives within limited closed environments, (2) there is a systematic material circulation between humans and their environments, and (3) neural transmission, the basic brain activity, is also a material process. He also describes the functional relationship between the limbic system and the cortex, with the former controlling emotional activity as well as instincts and desires. One of the categories of emotion-mood-seems to be closely related to environmental changes. He mentions various environmental factors which might cause several psychiatric symptoms, such as depressive states, lack of initiative, lack of sleep, etc. He concludes that functioning of the limbic system and cortex have to be well balanced for individuals to be regarded as normal (healthy). The problem, however, is how to do this because this balance is found in the relationship between humans and their environment. Too much rational influence must be avoided and too much emotional response must also be controlled. Our surrounding environment must be designed in such a way as to give us more temporal and spatial, as well as, social allowance.

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A stocking limitation of tilapia Oreochromis niloticus based on the balance of oxygen at 28°C in the fish-rearing closed tank which had been developed in order to establish CERAS, was estimated. Three experiments were conducted. They were measurements of the oxygen supply of the O₂/CO₂ exchange unit and released oxygen from the system (experiment I), measurements of the oxygen consumption and of ammonia excreted by O. niloticus under 60% standard feeding rate and photoperiod 12L12D (experiment II) and measurements of the oxygen supply and nitrifying activity of bacteria under supplementation of (NH₄) ₂SO₄ (experiment III). The oxygen supply of the O₂/CO₂ exchange unit can be described by the equation, OS=66.3F+122 where OS is oxygen consumption in mg/h and F, the flow late in l/min (1 <F <5). The oxygen requirement of the system was calculated as the sum total of oxygen consumption of O. niloticus and of the oxygen requirement of the nitrifying bacteria for nitrification of excretory products from fish. The equation formula is as follows; OC= (1.41 W^0.757+0.095W+1.83) n where OC is oxygen requirement in mg/h; W, the body weight in g (10 <W <250) and n, the number of fish. By mean of these equations, stocking limitation with O. niloticus in the system can be estimated. Therefore it is easy to find out the stocking density for long-term feeding experiment in the fishrearing closed tank.

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