Addition of the biodegradable polymer poly(butylene succinate-co-adipate) improves rotifer growth and prevents contamination

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  • 生分解性樹脂 poly(butylene succinate-co-adipate）（PBSA）の添加がワムシ培養に与える影響

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<p>Rotifer production without contamination by undesirable organisms is important for obtaining high yields of healthy fish. In this study, we investigated the suitability of the biodegradable polymer poly(butylene succinate-co-adipate) (PBSA) for rotifer production, focusing on the effects of PBSA addition on the growth of rotifers (Brachionus plicatilis), Euplotes ciliates, and Vibrio bacteria. PBSA addition enhanced rotifer growth in the tested range of 0.5-50 mg/ml. This effect was dose-dependent; the higher the concentration, the greater the effect. The maximum intrinsic and daily growth rates were 0.519 and 68%, respectively, equivalent to or higher than those under optimal rotifer culture conditions. In contrast, inhibitory effects on Euplotes growth were observed at 1 mg/ml or higher concentrations of PBSA, in a dose-dependent manner. Though it remains unclear if PBSA directly inhibits the growth of Vibrio bacteria, culture water of well-grown rotifers had fewer Vibrio bacteria. PBSA addition demonstrated pH-decreasing and buffering functions; the pH value in rotifer-free culture water decreased from 7.9 to 6.7 after a 5-day incubation period and to 5.8 after a 10-day incubation period. This study demonstrates that the application of PBSA in aquaculture could enhance rotifer production while avoiding contamination by Euplotes and Vibrio.</p>

Journal

  • Aquaculture Science

    Aquaculture Science 71 (2), 75-85, 2023-06-20

    Japanese Society for Aquaculture Science

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