Effects of different <I>Artemia</I> feeding schedules on body size variation in greater amberjack <I>Seriola dumerili</I> larvae

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  • Hashimoto Hiroshi
    Amami Laboratory, Seikai National Fisheries Research Institute, Fisheries Research Agency
  • Hayashi Tomohiro
    Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
  • Hamasaki Katsuyuki
    Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology
  • Matsunari Hiroyuki
    National Research Institute of Aquaculture, Fisheries Research Agency
  • Iwasaki Takashi
    Yaeyama Laboratory, Seikai National Fisheries Research Institute, Fisheries Research Agency
  • Teruya Kazuhisa
    Yaeyama Laboratory, Seikai National Fisheries Research Institute, Fisheries Research Agency
  • Hamada Kazuhisa
    Komame Laboratory, National Research Institute of Aquaculture, Fisheries Research Agency
  • Mushiake Keiichi
    Seikai National Fisheries Research Institute, Fisheries Research Agency

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Other Title
  • カンパチ仔稚魚の体サイズ差に及ぼすアルテミア給餌時期の影響
  • Effects of different Artemia feeding schedules on body size variation in greater amberjack Seriola dumerili larvae

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Description

Variations in growth rates are associated with increased aggressive behavior and cannibalism during greater amberjack Seriola dumerili seed production. We evaluated the effect of Artemia feeding schedule on variations in growth rate. Fish were divided into four treatment groups (T1-T4) and fed Artemia from 13 days post hatching (dph) [T1, 5.5 mm total length (TL)], 16 dph (T2, 7 mm TL), 20 dph (T3, 9 mm TL), or were not fed (T4) Artemia. Variations in body size, represented by the coefficient of variation (CV) of TL, were negatively correlated with fish dph at the onset of Artemia feeding; earlier ingestion of Artemia was associated with increased growth variation. The T4 CV values were similar to those in T1, because T4 contained a large proportion of small food-limited individuals. The proportion of fish consuming Artemia was significantly lower in T1 than that in the other groups. The amount of Artemia consumed tended to increase after fish reached 6 mm TL. Fish nutritional condition was estimated using the protein/DNA ratio and tended to be highest in T3. Our results suggest that feeding on Artemia before all fish can consume larger prey increases the variation in growth rate.

Journal

  • Aquaculture Science

    Aquaculture Science 63 (2), 127-134, 2015

    Japanese Society for Aquaculture Science

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