ヒラメ仔稚魚の摂餌は高い給餌率によって促進される Application of Higher Feeding Levels Prompts Larval and Juvenile Japanese Flounder to Take Food at a Higher Rate

Access this Article

Search this Article

Author(s)

Abstract

ヒラメ仔稚魚の摂餌に及ぼす給餌率の影響を孵化後12~36日にわたって検討した。試験1では給餌率を4段階 (L1~L4) 設定し, L1, L3およびL4はそれぞれL2の0.5, 2.5, 5倍とした。その結果, 仔稚魚の消化管内に出現した飼料生物個体数 (平均) はL4が最大で, 以下, L3, L2, L1の順であった。摂餌されたアルテミアのノウプリウス幼生個体数は仔魚の成長に伴い餌料選択性の高まりによって全ての給餌率において増加した。試験2では上記の4段階の給餌率で飼育された仔稚魚に試験的にL2の給餌率で給餌した。その結果は試験1のそれと類似し, 高い給餌率で飼育されるとより多く摂餌することが示唆された。いずれの試験においても全長16mm以上の稚魚はワムシをほとんど摂餌しなかった。

Effects of four different feeding levels (L1, L2, L3, and L4) on food ingestion of laboratory-reared larval and juvenile Japanese flounder <I>Paralichthys olivaceus</I> were studied from 12 to 36 days posthatch. In test 1, the food densities at L1, L2, and L4 were 0.5, 2.5, and 5 times that at L2. Feeding level L2 has conventionally been adopted by some hatcheries located in the western part of Japan for the mass propagation of Japanese flounder larvae and juveniles. The mean number of food organisms in the digestive tracts in L4 feeding level was greatest followed by L3, L2, and L1. The number of brine shrimp nauplii eaten increased for all feeding level with growth, because of selection by the larvae. In test 2, only L2 feeding level was applied in all the four different feeding levels fed-raised flounder groups (L1, L2, L3, and L4) separately. In this test a similar result as test 1 was observed; the obtained results suggest that the application of increased feeding levels does enhance the feeding response of larval and juvenile Japanese flounder. In both tests a few juveniles bigger than 16 mm in total length ate rotifers.

Journal

  • Aquaculture Science

    Aquaculture Science 50(2), 213-218, 2002-06-20

    Japanese Society for Aquaculture Science

References:  8

Codes

  • NII Article ID (NAID)
    10008750713
  • NII NACSIS-CAT ID (NCID)
    AN00124667
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    03714217
  • NDL Article ID
    6212621
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-761
  • Data Source
    CJP  NDL  J-STAGE  JASI 
Page Top