人工孵化クロマグロ仔魚のワムシに対する摂餌サイズ選択性と最適給餌密度

DOI 日本農学文献記事索引 Web Site 参考文献23件
  • 澤田 好史
    Fisheries Laboratory of Kinki University Ohshima Experiment Station
  • 宮下 盛
    Fisheries Laboratory of Kinki University Shirahama Experiment Station
  • 青山 光宏
    Faculty of Agriculture, Kinki University
  • 倉田 道雄
    Kinki University Fish Nursery Center Ohshima Station
  • 向井 良夫
    Fisheries Laboratory of Kinki University Ohshima Experiment Station
  • 岡田 貴彦
    Fisheries Laboratory of Kinki University Ohshima Experiment Station
  • 村田 修
    Fisheries Laboratory of Kinki University Shirahama Experiment Station
  • 熊井 英水
    Fisheries Laboratory of Kinki University Shirahama Experiment Station

書誌事項

タイトル別名
  • Rotifer-Size Selectivity and Optimal Feeding Density of Bluefin Tuna, Thunnus thynnus, Larvae.

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抄録

Rotifer-size selectivity and the optimal feeding density were examined for reared bluefin tuna larvae. Larvae were obtained from the broodstocks raised for 11 years in captivity. Larvae were fed rotifers at 5 different densities, 5, 10, 20, 30, or 40 ind./ml, on the day of the commencement of feeding (3 days after hatching) and the next day. In these experiments, rearing at the feeding densities of 10 and 20 ind./ml was extended to 7 days after hatching. Larvae were sampled and the gut contents were examined. The average rotifer number eaten by the larvae was lower at the density of 5 ind./ml than at other densities on the morning of day 3, and was lower at the density of 40 ind./ml on day 4 after hatching. This means that the optimal range of feeding density of rotifers for bluefin tuna larvae is from 10 to 30 ind./ml at the initial feeding. The lorica length (LL) of rotifers positively selected by larvae ranged from 100 μm to 239 μm from day 3 to 7 after hatching, and the lorica width (LW) ranged from 80 to 179 μm. The sizes of LL and LW positively selected by larvae shifted to larger ones with increasing time after hatching in this size range.

収録刊行物

  • 水産増殖

    水産増殖 48 (2), 169-177, 2000

    日本水産増殖学会

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