Influence of light-dark and lunar cycles on the ocular melatonin rhythms in the seagrass rabbitfish, a lunar-synchronized spawner
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The aim of this study was to investigate the effects of light-dark (LD) cycles and lunar phases on ocular melatonin rhythms in the seagrass rabbitfish, Siganus canaliculatus, a lunar-synchronized spawner. Under a natural 24-hr LD (12.00:12.00) cycle, ocular melatonin levels were low during daylight hours. The levels significantly elevated to peak during the mid-dark phase at 24.00 hr and then declined sharply in the early morning around 06.00 hr. These rhythms disappeared under either constant light (LL) or constant dark (DD) conditions. Melatonin levels remained low in LL compared with those in DD condition. These results suggest that ocular melatonin rhythms in the seagrass rabbitfish are suppressed in the presence of light. When fish were exposed to natural moon phases, ocular melatonin concentrations were higher around the new moon than both the first quarter and full moon phases. Exposure to experimental new moon conditions caused a significant increase in melatonin levels while those of the fish exposed to experimental full moon conditions were decreased. These results suggest that the seagrass rabbitfish perceives moonlight through the eye and that moonlight directly causes melatonin suppression.
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Melatonin synthesis is exquisitely light sensitive, inhibited by light exposure, and fueled in the dark.
“Moreover, melatonin synthesis is exquisitely light sensitive, inhibited by light exposure, and fueled in the dark [48,58,59]”
From The Still Dark Side of the Moon: Molecular Mechanisms of Lunar-Controlled Rhythms and Clocks (2020) · cites this paper as [59]
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The Still Dark Side of the Moon: Molecular Mechanisms of Lunar-Controlled Rhythms and Clocks
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- Authors
- Rahman, M. S., Kim, B., Takemura, A., Park, C., & Lee, Y.
- Affiliations
- University of the Ryukyus (JP)
- Jeju National University (KR)
- Corresponding author
- Rahman, Md. Saydur
- Venue
- Journal of Pineal Research
- Publisher
- Wiley
- Published
- 2004-06-16
- Volume
- 37
- Issue
- 2
- Pages
- 122-128
- ISSN
- 0742-3098 (ISSN-L)
- 1600-079X
- OpenAlex
- W2017564340
- Cited by
- 25
- References
- 43
- Citations by year
- 2025: 1 · 2023: 2 · 2022: 2 · 2021: 1 · 2020: 3 · 2019: 2 · 2018: 1 · 2014: 1 · 2013: 2 · 2012: 1
- FWCI
- 0.35
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Pineal Research (publishedVersion)
- PubMed (publishedVersion)
- Funders
- University of Texas at Austin
- Jeju National University
- Japan Society for the Promotion of Science
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
- Physical Sciences › Environmental Science › Global and Planetary Change › Impact of Light on Environment and Health
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
- Keywords
- melatonin rhythm, lunar phases, moonlight, light-dark cycle, Siganus canaliculatus
- MeSH terms
- Animals, Circadian Rhythm, Eye, Melatonin, Ocular Physiological Phenomena, Perciformes, Moon, Fluorescence Polarization Immunoassay
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