Effect of Krill Meal Supplementation in Soft-dry Pellets on Spawning and Quality of Egg of Yellowtail

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  • Verakunpiriya Visuthi
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • Watanabe Kanako
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • Mushiake Keiichi
    Komame Station of Japan Sea-Farming Association, Komame
  • Kawano Kazutoshi
    Komame Station of Japan Sea-Farming Association, Komame
  • Kobayashi Takashi
    Komame Station of Japan Sea-Farming Association, Komame
  • Hasegawa Izumi
    Komame Station of Japan Sea-Farming Association, Komame
  • Kiron Viswanath
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • Satoh Shuichi
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • Watanabe Takeshi
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries

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  • Effect of Krill Meal Supplementation in

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Description

This study was conducted to clarify whether krill meal contained in the soft-dry pellets (SDP) was responsible for the improved spawning performance and egg quality of yellowtail broodstock. After the termination of a previous study, broodstock from the experimental lots fed on raw fish, moist pellets and soft-dry pellets were separately kept on a commercial SDP for about 5 months. Thereafter, the fish which had been fed entirely on SDP were offered a test diet without krill meal supplementation, whereas broodstock which had been fed moist pellets or raw fish were fed test diets containing 20 and 30% krill meal, respectively; all for about 5 months prior to spawning.<br> The total egg production, the hatching rate among the fertilized eggs and the rate of normal larvae were the highest in the eggs obtained from the brood fish fed SDP without krill meal supplementation; these figures decreased relatively with the increase of krill meal in the diets. The rates of buoyant and fertilized eggs among the total eggs produced were not markedly different. It appears that higher levels of krill meal in the SDP was not beneficial for yellowtail brood fish.

Journal

  • Fisheries science

    Fisheries science 63 (3), 433-439, 1997

    The Japanese Society of Fisheries Science

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