The reproductive physiology of 530 specimens of Mugil cephalus (Family: Mugilidae) were collected from catches by gill and trammel nets operating on Benghazi coast on Mediterranean Sea - Libya was studied, there were monthly variations in sex ratio and a tendency for females (298 fish = 56.2%) than males (232 fish = 43.8%) for the whole population, Overall sex ratio was (1 : 1.28) for males to females respectively, First maturation size was determined for females L50 = 34.1 cm and for males L50 = 32.3 cm, All individuals have definite breeding season which extends from July to October, An increase in Oocyte diameters was evident in July (489 µ ± 5.34), and this increase continued in the following months till October (599 µ ± 11.04), the absolute fecundity ranged from 578981 to 2598022 for fish total length ranging from 19.5 to 47.4 cm, whereas relative fecundity ranged from 29036 to 57352 / cm.
Difference in Sex Ratio and Physiological Indices of Cultured and Wild Grey Mullet Mugil cephalus in Taiwan.