Recovery of nori <i>Porphyra</i> color by uptake of nutrients supplied intermittently from rivers

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  • TAKAGI SHUZO
    Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries, Research Institute for Fisheries Science
  • SHIMIZU YASUKO
    Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries, Research Institute for Fisheries Science
  • KUSAKA KOJI
    Okayama Prefectural Technology Center for Agriculture, Forestry and Fisheries, Research Institute for Fisheries Science
  • FUJISAWA TOKISHIGE
    Kagawa Prefectural Fisheries Experimental Station
  • FUJIWARA MUNEHIRO
    Kagawa Prefectural Fisheries Experimental Station
  • WATANABE YASUNORI
    Hokkaido National Fisheries Research Institute
  • FUJIWARA TATEKI
    Graduate School of Agriculture, Kyoto University

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Other Title
  • 河川から間欠的に供給される栄養塩によるノリ色調の回復
  • カセン カラ カンケツテキ ニ キョウキュウ サレル エイヨウエン ニ ヨル ノリ シキチョウ ノ カイフク
  • Recovery of nori Porphyra color by uptake of nutrients supplied intermittently from rivers

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Abstract

  To elucidate the threshold amount of DIN value for keeping the nori color, nori color (a* value) and variability of fluval DIN concentration were investigated in the Bisan Strait. The results show that even if oceanic DIN is less than 1 μM, nori can keep its color (a* value>6) by taking up the DIN supplied intermittently from rivers. In that time, the standard deviation of DIN was larger than 2 μM. At this farm, the total period when DIN>7 μM was 1.6 hour day−1; this condition coincides with an incubation experiment conducted in a laboratory. The discolored nori transplanted to this place recovered its a* value within 14 days to the same level as that of the nori originally growing at this place.<br>

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