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Current knowledge of lunar synchronized spawning in fish.

Kodai Fukunaga1, Akihiro Takemura

  • 1Co-Creation Management Department, University of the Ryukyus, Nishihara, Japan.

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|December 9, 2025
PubMed
Summary
This summary is machine-generated.

Marine species synchronize spawning with lunar cycles for reproductive success. This lunar-synchronized spawning is influenced by moonlight cues, genetic factors, and environmental conditions, varying even by location.

Keywords:
Lunar-synchronized spawningmarine fishmass spawningreproductionspawning aggregation

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Area of Science:

  • Marine Biology
  • Chronobiology
  • Animal Behavior

Background:

  • Many marine organisms exhibit sensitivity to lunar cycle variations, including tidal shifts and moonlight intensity.
  • Lunar-synchronized spawning, common in temperate and tropical species like corals, worms, and fish, enhances fertilization success.
  • Recent research has focused on understanding the mechanisms behind lunar-synchronized spawning in fish, particularly families Siganidae and Serranidae.

Purpose of the Study:

  • To investigate the phenomenon of lunar-synchronized spawning in marine organisms.
  • To explore the underlying mechanisms and environmental influences on lunar spawning cycles in fish.
  • To understand geographical variations in spawning moon phases and their genetic basis.

Main Methods:

  • Field observations in tropical and subtropical waters to identify spawning periods.
  • Genetic analysis to understand species-specific adaptations and photoresponsiveness.
  • Physiological experiments to assess the role of nocturnal light in reproduction.

Main Results:

  • Many marine species, including fish, exhibit synchronized spawning during new or full moon phases.
  • Spawning timing can be genetically determined and influenced by physicochemical and ecological factors.
  • Geographical variations in spawning moon phases suggest genetic differences in light detection.

Conclusions:

  • Lunar-synchronized spawning is a critical reproductive strategy in marine ecosystems.
  • Moonlight cues are primary regulators, with genetic variation influencing species' photoresponsiveness and geographical adaptations.
  • Nocturnal light plays a significant role in fish gonadal development and spawning timing.