Pinar  Celik, Ihsan  Celik, 
    Effect of Lunar Synchronization on the Reproduction Time of Discus Fish (<I>Symphysodon </I>sp.) Under Controlled Aquarium Conditions,
    Journal of Animal and Veterinary Advances,
    Volume 10,Issue 7,
    2011,
    Pages 890-893,
    ISSN 1680-5593,
    javaa.2011.890.893,
    (https://makhillpublications.co/view-article.php?doi=javaa.2011.890.893)
    Abstract: The reproduction times of the discus fish were observed for 2 years under fully-controlled production conditions. The position of the moon was also recorded on the spawning day of the fish at a light photoperiod of 14 h and a dark photoperiod of 10 h with water quality parameters of 27-30&deg;C, pH 4.5-6.5 and conductivity of 80-200 &#956;S. Of 102 observed reproductions, 28 occurred at the first quarter of the moon, 28 at full moon, 40 at the last quarter and 6 at new moon. Accordingly, it has been concluded that the discus fish display a reproduction behavior according to the lunar cycle even indoors, although they do not receive direct moonlight.
    Keywords: Discus;symphysodon;lunar synchronization;spawning;breeding;Turkey