Effects of dietary phosphorus restriction on phosphorus balance in rainbow trout <I>Oncorhynchus mykiss</I>

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  • Sugiura Shozo
    School of Environmental Sciences, University of Shiga Prefecture

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  • ニジマスのリン収支における飼料リンの影響
  • Effects of dietary phosphorus restriction on phosphorus balance in rainbow trout Oncorhynchus mykiss

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Abstract

The present study examined responses of fish to dietary phosphorus (P) restriction. Two groups of rainbow trout (mean body weight 129 and 115 g) were fed for 32 and 53 days, respectively, with either the low-P (LP) or high-P (HP) diet. Some fish were starved concurrently. Fish fed the LP diet (LP fish) gradually decreased plasma P from 93 (day 0) to 17 mg/l (day 32), whereas those fed the HP diet (HP fish) and the starving fish maintained normal plasma P levels (81-130 mg/l). Plasma P levels decreased markedly after feeding the LP, but not HP, diet. When fish were fed glucose, the plasma glucose level increased markedly for both LP and HP fish. The LP fish apparently absorbed P from water (~0.2 mg P/kg fish/day), whereas starving fish excreted P (1.8 mg P/kg fish/day). Waterborne P (5 and 50 mg P/l) had little effect on fish plasma P levels regardless of the fish P status. The LP fish had lower ash (65%), P (67%) and calcium (39%) contents compared to the HP fish on a whole body basis. Calcium-wasting is most characteristic in dietary P deficiency.

Journal

  • Aquaculture Science

    Aquaculture Science 63 (3), 245-253, 2015

    Japanese Society for Aquaculture Science

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