Reproductive Biology of Diplodus Sargus (Linnaeus, 1758), Benghazi Coast Mediterranean Sea, Libya
DOI:
https://doi.org/10.54172/mjsc.v24i1.511Abstract
The reproductive biology of Diplodus sargus, (family: Sparidae) an indigneous species inhabiting Libyan eastern coast was studied. There were monthly variation in sex ratio, and a tendency for more females (324 fish, 52.7%) than males (276 fish, 47.3%) for the whole population. Overall sex ratio was 1: 1.17 for males to females. The male of Diplodus sargus attained its first maturity at the totals length of 17.1 cm., while the first sexual maturity of female was attained at 20 cm. The gonado- somatic indices of males was lower than that of females. Males and females have a definite breeding season which extends from January till October. In March and June, Diplodus sargus population migrated from the Libyan eastern coast for spawning elsewhere. An increase in oocyte diameters was evident in January (with an average of 455 p) and this increase continued in the following months till June, with an average value of 1265p. The absolute fecundity ranged from 9144 to 173526 with length ranging from 17.2 to 27.6 cm. However, its fecundity increased from 76228 to 150236 with the increase in weight from 38.7 to 140.9 gm.
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