“…In fish, the neuroendocrine regulation stimulates testis maturation and milt production, which can be varied based on seasons (Assem et al, 2016;Trudeau, 1997). The variations in the duration of solar photoperiod, rainfall and some other environmental factors between spawning seasons can also make the significant differences in testis maturation and milt production (Bhattacharyya & Maitra, 2006;Mananõs, Duncan, & Mylonas, 2008). For instance, solar photoperiod can regulate the secretion of melatonin and other reproductive hormones to enhance the maturation of testes and overall milt production in carps and other fish species (Aripin, Jintasataporn, & Yoonpundh, 2015;Maitra & Hasan, 2016).…”