Semi-extensive larviculture of pacific cod <I>Gadus macrocephalus</I> utilizing wild zooplankton in the sea net-cage

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  • Tomoda Tsutomu
    National Research Institute of Aquaculture, Fisheries Research Agency, Shibushi Laboratory
  • Kumon Kazunori
    Seikai National Fisheries Research Institute, Fisheries Research Agency, Amami Laboratory
  • Watanabe Ken-ichi
    Department of Aquatic Bioscience, Faculty of Bio-industry, Tokyo University of Agriculture
  • Arai Daisuke
    Research Promotion Division, Agriculture, Forestry and Fisheries Research Council
  • Koiso Masahiko
    Seikai National Fisheries Research Institute, Fisheries Research Agency, Yaeyama Laboratory
  • Tezuka Nobuhiro
    Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Miyazu Laboratory
  • Hotta Kazuo
    Fisheries Research Institute, Toyama Prefectural Agricultural, Forestry & Fisheries Research Center
  • Kuwada Hiroshi
    National Research Institute of Aquaculture, Fisheries Research Agency, Minami-izu Laboratory

Bibliographic Information

Other Title
  • 海上網生簀における天然プランクトンを用いたマダラの半粗放的種苗生産
  • カイジョウモウ イケス ニ オケル テンネン プランクトン オ モチイタ マダラ ノ ハンソホウテキ シュビョウ セイサン

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Abstract

The present study intends to develop larviculture techniques for mass production of Pacific cod Gadus macrocephalus juveniles possessing better seed quality and lower cost. We evaluated the efficiency of semi-extensive larviculture of Pacific cod utilizing wild zooplankton in the sea net-cage. Main food was light-allured zooplankton and supplementary foods were enriched Artemia nauplii, commercial frozen copepoda and dry feed. Metamorphosing cod larvae (12 and 13 mm in total length, TL) were raised until approximately 30 mm TL, and larvae and metamorphosed juveniles (17, 19, and 20 mm TL) were raised until 45 to 50 mm TL. Survival rates ranged from 46.4 to 48.7% in the former groups, and from 51.4 to 76.5% in the latter groups. A total of 204.8 and 183.7 thousand juveniles were produced in each semi-extensive trial. Moreover, semi-extensive method offered the benefits of labor saving and cost reduction. One juvenile with 30 mm and 45 to 50 mm TL cost only 6.4 yen and 6.2 to 10.5 yen, respectively. These results suggest that cod larviculture utilizing wild zooplankton in the sea net-cage provides faster growth, higher survival rate, and lower cost. We propose that this rearing method may be applicable to various fish species for stock enhancement.

Journal

  • Aquaculture Science

    Aquaculture Science 64 (1), 109-119, 2016

    Japanese Society for Aquaculture Science

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