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Relation between diatom growth and bacterial population in semi mass culture tanks of diatom

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Title: Relation between diatom growth and bacterial population in semi mass culture tanks of diatom
Other Titles: 珪藻大量培養槽における珪藻と環境細菌との関係
Authors: Suminto / Hirayama, Kazutsugu
Authors (alternative): 平山, 和次
Issue Date: Dec-1993
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.74・75, pp.37-41; 1993
Abstract: The practical semi mass culture of diatoms was conducted at the Yuya Laboratory of Nippon Saibai Suisan Co., Ltd., Yamaguchi Prefecture, using cylindrical fiberglass tanks (500 l of water capacity). At the start of the culture, to the tanks inorganic fertilizers were introduced, but no starter of the diatom species cultured was inoculated. Either growth pattern of diatoms or bacterial had the common characteristics in three culture trials. The bacterial population (CFU/ml) increased with the growth of diatoms in early period of the culture but the population ratio of the bacterial to the diatoms rapidly declined. At the peak of diatom population (the 3rd or 4th day), the bacterial population made a bottom and the population ratio showed the lowest value. After that, diatom density sharply declined and on the contrary bacterial population rapidly increased. These facts suggest that the actively growing population each of diatom and bacteria may exhibit the suppressive effect on the growth of another population and that artificial control of bacterial population (so-called "bio-control method") could be effective on the improvement in the technique of diatom mass culture. / 日本栽培水産株式会社油谷研究所において1992年5,6,7月の3回500ℓの水槽を用いて珪藻の野外大量培養を試みた.使用した海水は261μmのメッシュのナイロンネットで沪過したものである.培養開始時に無機栄養塩は添加したが,培養珪藻を種として添加することはしなかった.増殖した珪藻が減少するまで5-6日間培養は継続した.珪藻は最初の2-3日間で速やかに増殖したが3-4日目にはピークに達し,以後減少した.一方,細菌濃度(CFU/ml)は珪藻の増殖時にも増大したが,珪藻細胞数に対する細菌数の比は速やかに減少した.珪藻濃度がピークに達した3-4日目には細菌濃度は一旦減少し,細菌の珪藻に対する細胞比は最低となった.以後珪藻濃度は減少するが細胞濃度は急速に増大したので,細胞比は著しく増大した.時期の異なる3回の培養でこの傾向は一致した. 以上の結果は珪藻培養槽内では珪藻と細菌とは競争関係にあることを示している.今後,環境細菌制御(いわゆるバイオコントロール法)よる珪藻大量培養方法の改善の可能性を追究する.
Keywords: Diatom / mass culture / bacteria / growth pattern
URI: http://hdl.handle.net/10069/29829
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第74,75号

Citable URI : http://hdl.handle.net/10069/29829

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