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  • Title: Lunar periodicity and the timing of river entry in Atlantic salmon Salmo salar.
    Author: Kuparinen A, O'Hara RB, Merilä J.
    Journal: J Fish Biol; 2009 Jul; 74(10):2401-8. PubMed ID: 20735561.
    Abstract:
    Historical catch records of Atlantic salmon Salmo salar from three rivers discharging to the Baltic Sea in an area free from tides and from strong effects of the moon on illumination were analysed to investigate whether timing of S. salar river entry was associated with lunar cycles directly. Although a significant effect of lunar phase on river entry was detected, with more fish entering rivers around the full moon than other phases, the effect of the lunar cycle was very small compared with other sources of variation. Hence, the biological role of lunar cycle as a determinant of the timing of S. salar runs in the investigated populations was negligible, suggesting that lunar cycle per se does not play a role in the timing of S. salar river entry.
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