Effect of Diet Size on Food Intake and Growth of Japanese Flounder Paralichthys olivaceus Juveniles

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  • NARITA Atsushi
    Atumi Plant, Nisshin Marinetech Co., Ltd.
  • IMAI Tadashi
    Department of Fisheries, School of Marine Science and Technology, Tokai University
  • GOSHI Masahiko
    General Education Center, Shimizu, School of Marine Science and Technology, Tokai University
  • TANAKA Yoichi
    Institute of Oceanic Research and Department, Tokai University
  • KOJIMA Tomokazu
    Marine Products Division, Nitto Fuji Flour Milling Co., Ltd.
  • AKIYAMA Nobuhiko
    Department of Fisheries, School of Marine Science and Technology, Tokai University

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Other Title
  • 配合飼料の粒径がヒラメ稚魚の摂餌量と成長に及ぼす影響
  • ハイゴウ シリョウ ノ リュウケイ ガ ヒラメ チギョ ノ セツジリョウ ト セイチョウ ニ オヨボス エイキョウ

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Abstract

This study aims to investigate the effects of different diet sizes on the growth of Japanese flounderParalichthys olivaceusjuveniles by controlling diet sizes that are possible for the juveniles to feed on. For the experiment, diet was sieved out to six measured sizes. The modes (ranges) of minimum diameter were 375μm (225-538μm), 438μm (288-613μm), 500μm (350-700μm), 700μm (450-913μm), 800μm (563-1063μm) and 925μm (713-1138μm) . These diet sizes were smaller than the mouth size (=upper jaw length×√2) of the fish, thus all juveniles were able to feed on all sizes of diet. Few juveniles smaller than 10 mm in standard length (SL) fed on the diet. For fish of 10-15 mm SL, many of them fed on the diet when the size was 438μm or larger. For fish larger than 15 mm SL, decreasing proportion of non-feeding fish were found as the diet size increased. For the juveniles of 15-25 mm SL, food intake of 500μm size was less than that of 700μm, and of 25-30 mm SL, food intake increased as the diet size became larger. When comparing diet sizes between 500μm and 925μm with the total food intake weight being the same, it was found that fish which fed on the larger diet grew faster. In order to achieve the most efficient growth of Japanese flounder juveniles, it is necessary to feed them on the maximum size diet that they can take.

Journal

  • Aquaculture Science

    Aquaculture Science 55 (1), 41-46, 2007

    Japanese Society for Aquaculture Science

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