循環濾過式飼育水槽の微生物化学的研究-I : 魚の飼育に伴なう水質ならびに微生物相の変化について

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In fish cultivation using an aquarium with circulating system, one of the most important factors is the quality of breeding water, which depends primarily on the biochemical activities of the microorganisms in the aquarium. The present studies have been undertaken with the purpose of building up the principle of fish cultivation from the microbiological standpoint. This paper deals with the most fundamental problem, the changes in the qualities of the breeding water and in the bacterial population which occur during the process of fish cultivation using the aquarium with freshly introduced filter-sand and sea water. The results which were obtained are as follows: 1. The qualities of the breeding water and the bacterial population of the filter-sand and of the water change greatly during the early stage of the cultivation, and reach to an equlibrium in about two months. As the nitrifying activities of the filter-sand become suffi-ciently great at the time, the sand seems to be “ripened”. 2. As the number of the various kinds of bacteria which occur in the breeding water is extremely small as compared with that in the filter-sand, most parts of the biochemical reaction in the aquarium might take place in the filter-sand bed. 3. After several months of cultivation, considerably large number of denitrifying bacteria which liberate nitrogen from nitrate is found in the filter-sand bed, and there may be a some-what anaerobic microsphere in it even when sufficient amount of air is supplied in the water, judging from the fact that sulphate reducing bacteria which grow only under somewhat an-aerobic condition are detected in the bed. 4. Of the nitrifying bacteria in the aquarium, the soil bacteria which can grow and show nitrifying activities in the media without sea water are negligible in their number as compared with the marine ones.
公益社団法人日本水産学会の論文

循環濾過式飼育水槽の微生物化学的研究-I : 魚の飼育に伴なう水質ならびに微生物相の変化について

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