染色体操作によるサケ科魚類の三倍体及び雌性発生二倍体の生物学的特性と形質遺伝に関する研究‐ＶＩ　ニジマスの三倍体と二倍体の摂餌競合と，その競合が三倍体の成長に及ぼす影響

DOI

書誌事項

タイトル別名
  • Study of Biological Characters and the Genetics of Some Traits of Triploid and Gynogenetic Diploid on Salmonid Fishes-VI. The Competition for Food between Triploids and Diploids and its Effect on the Growth of Triploids in Rainbow Trout.

説明

We compared feeding and growth potential between diploid and triploid rainbow trout Oncorhynchus mykiss under communal and separate rearing conditions. Under communal rearing conditions and at 100 % of the daily feeding rate of dry food recommended by Leitritz, significant differences in the body weight between diploid and triploid were noted from 16 weeks after the start of the feeding trial. At twenty weeks, the mean body weight of diploid and triploid trout were 18.62 ± 0.21 (SEM) and 17.38 ± 0.22 g, respectively. When using 50% or 30% of the feeding amounts recommended by Leitritz, there was a proportional decrease in the growth rate of triploids in comparison with that of diploids as feeding amounts decreased. Under separate rearing conditions and at 100 % feeding rate, triploid showed better growth than diploid. A comparison of the amount of food taken by diploid and triploid trout in communal rearing conditions revealed a progressive decrease in the food available for the triploids with decreased feeding rates. The growth hormone levels in plasma in both ploidies were not significantly different. These results suggest that the decreasing growth rates of triploids reared together with diploids was due to poor performance of the former in the competition for food.

収録刊行物

  • 水産増殖

    水産増殖 45 (1), 87-96, 1997

    日本水産増殖学会

キーワード

詳細情報 詳細情報について

  • CRID
    1390282679694365568
  • NII論文ID
    130003714758
  • DOI
    10.11233/aquaculturesci1953.45.87
  • ISSN
    21850194
    03714217
  • 本文言語コード
    ja
  • データソース種別
    • JaLC
    • CiNii Articles
  • 抄録ライセンスフラグ
    使用不可

問題の指摘

ページトップへ