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- MASUMA SHUKEI
- Amami Station, Japan Sea Farming Association
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- KAWAMURA GUNZO
- Faculty of Fisheries, Kagoshima University
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- TEZUKA NOBUHIRO
- Amami Station, Japan Sea Farming Association
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- KOISO MASAHIKO
- Amami Station, Japan Sea Farming Association
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- NAMBA KENJI
- Faculty of Applied Biological Science, Hiroshima University
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抄録
In bluefin tuna culture, a high mortality of juveniles is caused by bumping into the tank and net-pen walls at dawn. This bumping can possibly be attributed to visually disoriented behavior of the fish. To examine this possibility, the authors carried out retinomotor response experiments with juvenile bluefin tuna (50.7-96.8 mm total length, at which they were transferred from a indoor tank to a sea net-pen) and measured ambient light intensity at the culture site at dawn. The light intensity at which the transition from scotopic to photopic vision takes place was 7.52 lx and the time taken by the transition was 15 min. At dawn, the ambient light intensity rapidly increased from scotopic light intensity level and attained photopic light intensity level in 10 min. This incompatibility of the retinal adaptation with the change in the ambient light intensity could cause the visual disorientation of the fish. It is therefore possible that the visually disoriented juveniles cannot control their high power swimming and thus bump into the walls at dawn.
収録刊行物
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- Fisheries science
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Fisheries science 67 (2), 228-231, 2001
公益社団法人 日本水産学会
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詳細情報 詳細情報について
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- CRID
- 1390001204429569664
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- NII論文ID
- 130003742351
- 10008268448
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- NII書誌ID
- AA10993718
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- ISSN
- 14442906
- 09199268
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- NDL書誌ID
- 5750558
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可