UTILIZATION OF FISH OIL BY CANDIDA LIPOLYTICA AND GEOTRICHUM CANDIDUM

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Abstract
Oil from alewife (Alosa pseudoharingus) was oxidized in shake flasks by Candida lipolytica Y1094 and Geotrichum candidum Y552. Utilization of alewife oil in a basal medium indicated that fish stickwater was as effective a growth supplement as yeast extract or cornsteep liquor. Maximum cell yields of both organisms were obtained when the starting pH was between 7.5–8.2. Nitrogen uptake per gram of cells for both microorganisms was relatively greater during the first 11 h of oil oxidation and declined thereafter. Fish oil concentrations in the basic medium were varied between 0.5 to 10% w/v. The increase in cell yield essentially stopped for both organisms at the 5% oil level. With 5 to 10% oil pH values of media decreased below the optimal range after 22 h without significantly more cell production than in media with 1.0 and 2.5% oil. After 33 h pH values of the media with high oil concentrations decreased to a level where growth was inhibited.

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