The Growth Process and N, P Uptake Rates of Undaria pinnatifida Cultured in Coastal Fish Farms

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  • KITADAI Yuuki
    Laboratory of Marine Production and Environmental Studies, Graduate School of Agricultural Science, Kagoshima University
  • KADOWAKI Shusaku
    Laboratory of Aquatic Resource Science, Faculty of Fisheries, Kagoshima University

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Other Title
  • 浅海養魚場における栽培ワカメ，Ｕｎｄａｒｉａ　ｐｉｎｎａｔｉｆｉｄａの生長過程とＮ，Ｐ吸収速度
  • センカイ ヨウギョジョウ ニ オケル サイバイ ワカメ Undaria pinnatifida ノ セイチョウ カテイ ト N P キュウシュウ ソクド

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Abstract

Biological water purification by culturing Undaria pinnatifida in coastal fish farms was estimated as a function of dissolved inorganic nutrients, light intensity, and water temperature.U. pinnatifida was cultured from 1 m to 4 m depths in coastal fish farms from November, 2002 to May, 2003. The maximum growth rate and growth of blade length were recorded 4.2 cm/day in growth phase, reached to 182 cm in maturation phase at 2 m depth. Average contents of total nitrogen (N) and total phosphorus (P) in blade part of U. pinnatifida reached to 19 mg N/g dry and 2.3 mg P/g dry in all phase. The maximum N, P uptake rates by blade part of U. pinnatifida were 3.1 mg N/m2/day and 0.54 mg P/m2/day at 2 m depth. Michaelis-Menten's constants of N, P uptake rates were 17μg N/l and 6.2 μg P/l. Downward irradiance of 670μmol/m2/s resulted in the maximum N, P uptake rates. N, P uptake rates by blade part of U. pinnatifida at 16°C were 2.5 mg N/m2/day and 0.44 mg P/m2/day. Water temperature coefficients of N, P uptake rates were 1.090 and 1.081. The N and P uptake rates of cultured U. pinnatifida were formulated from dissolved inorganic nutrients, light intensity and water temperature characteristics found in coastal fish farms, and the calculated values corresponded well with the observed values.

Journal

  • Aquaculture Science

    Aquaculture Science 52 (4), 365-374, 2004

    Japanese Society for Aquaculture Science

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