2469-2476In the present work, the reproductive study of the fish species Trachurus trachurus (Linnaeus, 1758) in Algeria, was investigated which is important for fishery resources and conservation management. 1495 samples were collected from Oran Bay (Western coast of Algeria) between July 2010 and June 2011. This paper provides values of sizes at first sexual maturity (L50) that were estimated for males at 18.42 cm and females 18.28 cm, respectively. The spawning period for the population extends from January to May and the spawning peak occurs from January to March. However, the factor of condition (K) increased in summer during the sexual resting phase. This factor is weak in winter during the period of reproduction. Regarding the sex ratio, there was no significant difference in the number of males and females
