Efficiency of Chilled and Frozen Nannochloropsis sp. (Marine Chlorella) for Culture of Rotifer

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Other Title
  • シオミズツボワムシの飼育における冷蔵及び冷凍ナンノクロロプシス(海産クロレラ)の有用性
Published
1989-12-25
Resource Type
departmental bulletin paper
Publisher
鹿児島大学

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Tests for food efficiency and characteristics of chilled and frozen Nannochloropsis sp. (marine Chlorella) were conducted in order to know the applicability of preserved food in massculture of rotifer, Brachionus plicatilis, in consideration of the maintenance of the water quality. Chilled alga was prepared through concentration and preservation by chilling at 3°C. While frozen food was prepared by freezing of the concentrated alga at -25°C within the period of 20 minutes. Both types of food were preserved at the respective temperature for a month before the use in the experiment. As to food efficiency of preserved algae, no significant difference was observed on the population growth of rotifers fed on both fresh and preserved algae. As to activity of preserved alga, chilled alga represented the same growth ability of fresh one under high light intensity. However, at low light intensity of 150 lx, growth was not observed. Frozen alga showed 3 times higher exudation of organic nitrogen from cell, in comparison with chilled alga.

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