スペルリナ2%添加飼料 (EP) を給餌したシマアジ親魚の産卵・卵質

  • VASSALLO-AGIUS Robert
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries
  • 虫明 敬一
    Komame Station of Japan Sea Farming Association
  • 今泉 均
    Komame Station of Japan Sea Farming Association
  • 山崎 哲男
    Komame Station of Japan Sea Farming Association
  • 渡邉 武
    Laboratory of Fish Nutrition, Department of Aquatic Biosciences, Tokyo University of Fisheries

書誌事項

タイトル別名
  • Spawning and Quality of Eggs of Striped Jack Fed Raw Fish or Dry Pellets with 2% Spirulina.
  • Spawning and quality of eggs of striped jack fed raw fish or dry pellets with 2パーセント Spirulina

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抄録

This experiment was carried out to compare spawning performance and quality of eggs from broodstock striped jack, Pseudocaranx dentex, between those fed raw fish and dry pellets supplemented withSpirulina.<BR>The test diet consisted of soft-dry pellets supplemented with 2%Spirulina (sSDP) soas to provide 30 ppm zeaxanthin which was presumed to be effective to enhance quality of yellowtail eggs, and the control diet was a raw fish mix (RF) made up of frozen shrimp, squid and mackerel. The 11 and 12 year old fish had been cultured from the juvenile stage on raw fish. They were split into two groups and fed the diets for a period of 2 months in net cages before being transferred to indoor spawning tanks. Spawning was induced by raising the water temperature to 22°C and keeping it constant until the end of spawning. During spawning, both groups accepted the diets and were fed once a day, six times a week.<BR>The RF group started spawning two days before the sSDP group, and went on to spawn for a total of 69 times whereas the sSDP group spawned 37 times. The longer spawning period for the RF group resulted in a total egg production more than 2.5 times higher than that of the sSDP group. Although buoyancy rates, fertilization rates and hatching rates for normal larvae were about 20% higher for the RF group, survival activity index values (SAT) were very similar, indicating that the sSDP diet did not affect larval vitality. No carotenoids were detected in the eggs from both groups.<BR>These results indicate that dry pellets supplemented with 2% Spirulina (7 ppm zeaxanthin in diet) did not show any distinct gain over raw fish in enhancing quantity and quality of eggs of striped jack broodstock.

収録刊行物

  • 水産増殖

    水産増殖 47 (3), 415-422, 1999

    日本水産増殖学会

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