Daily growth increment formation and its lunar periodicity in otoliths of the myctophid fish Myctophum asperum (Pisces: Myctophidae).
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- HAYASHI AMANE
- Ocean Research Institute, University of Tokyo
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- KAWAGUCHI KOUICHI
- Ocean Research Institute, University of Tokyo
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- WATANABE HIKARU
- Ocean Research Institute, University of Tokyo National Research Institute of Far Seas Fisheries
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- ISHIDA MINORU
- National Research Institute of Fisheries Science
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Abstract
The surface-migratory myctophid fish, Myctophum asperum, of the western North Pacific was found to have daily growth increments of its sagittal otolith, which also exhibited lunar periodicity in the deposition of increments. Daily deposition of the otolith increments was verified because the width of the marginal increment increased during the night and early morning between 20.00 h and 08.00 h and its growth stopped during the day. An autocorrelation analysis of the increment widths, which were measured consecutively in 11 specimens covering 33 synodic months, also showed a lunar periodicity in increment deposition. The mean increment widths during five days around the time of a full moon were significantly narrower than those around a new moon in 18 of the 33 full moon cases (P<0.01: Student's t-test) and, on average, tended to be narrow in 29 cases. The cause of this tendency is thought to be slower growth caused by staying in deeper and colder habitat due to the suppression of diel vertical migration and/or lower food availability resulting from the possible dispersion of zooplankton during the full moon period.
Journal
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- Fisheries science
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Fisheries science 67 (5), 811-817, 2001
The Japanese Society of Fisheries Science
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Details 詳細情報について
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- CRID
- 1390001204427756416
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- NII Article ID
- 130003742367
- 10008270506
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- NII Book ID
- AA10993718
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- ISSN
- 14442906
- 09199268
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- NDL BIB ID
- 5950769
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed