Impacts of moonlight on fish reproduction

Taro Ikegami, Yuki Takeuchi, Sung Pyo Hur, Akihiro Takemura

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

The waxing and waning cycle of the moon is repeated at approximately 1-month intervals, and concomitant changes occur in the levels of moonlight and cueing signals detected by organisms on the earth. In the goldlined spinefoot Siganus guttatus, a spawner lunar-synchronized around the first quarter moon, periodic changes in moonlight are used to cue gonadal development and gamete release. Rearing of mature fish under artificial constant full moon and new moon conditions during the spawning season leads to disruption or delay of synchronous spawning around the predicted moon phase. Melatonin, an endogenous transducer of the environmental light/dark cycle, increases in the blood and in the pineal gland around the new moon period and decreases around the full moon period. In synchrony with melatonin fluctuation, melatonin receptor(s) mRNA abundance is higher during the new moon period than during the full moon. The melatonin/melatonin receptor system is likely affected by moonlight. Measurements of the expression patterns of clock genes in neural tissues demonstrate that Cryptochrome (Cry1 and Cry3) and Period (Per2) fluctuate with lunar periodicity, the former peaking in the medial part of the brain around the first quarter moon period, and the latter peaking in the pineal gland around the full moon. Some clock genes may respond to periodic changes in moon phase and appear to be involved in the generation of lunar-related rhythmicity in lunar spawners. Thus, some fish use moonlight-related periodicities as reliable information for synchronizing the timing of reproductive events.

Original languageEnglish
Pages (from-to)59-66
Number of pages8
JournalMarine Genomics
Volume14
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint

melatonin
Moon
Reproduction
Fishes
fish
pineal body
periodicity
spawning
Siganus
Periodicity
lunar phase
Melatonin
receptors
Melatonin Receptors
Pineal Gland
germ cells
nerve tissue
rearing
genes
photoperiod

Keywords

  • Clock gene
  • Cryptochrome
  • Melatonin
  • Moonlight
  • Period
  • Spinefoot

ASJC Scopus subject areas

  • Aquatic Science
  • Genetics
  • Medicine(all)

Cite this

Ikegami, T., Takeuchi, Y., Hur, S. P., & Takemura, A. (2014). Impacts of moonlight on fish reproduction. Marine Genomics, 14, 59-66. https://doi.org/10.1016/j.margen.2013.11.007

Impacts of moonlight on fish reproduction. / Ikegami, Taro; Takeuchi, Yuki; Hur, Sung Pyo; Takemura, Akihiro.

In: Marine Genomics, Vol. 14, 2014, p. 59-66.

Research output: Contribution to journalArticle

Ikegami, T, Takeuchi, Y, Hur, SP & Takemura, A 2014, 'Impacts of moonlight on fish reproduction', Marine Genomics, vol. 14, pp. 59-66. https://doi.org/10.1016/j.margen.2013.11.007
Ikegami, Taro ; Takeuchi, Yuki ; Hur, Sung Pyo ; Takemura, Akihiro. / Impacts of moonlight on fish reproduction. In: Marine Genomics. 2014 ; Vol. 14. pp. 59-66.
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