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¹ Canakkale Onsekiz Mart University, Faculty of Fisheries, Çanakkale, Turkey DOI : 10.4194/1303-2712-v12_4_08 Viewed : 4658 - Downloaded : 5163 Age, growth, mortality and reproduction of the chub mackerel (Scomber japonicus Houttuyn, 1782) were determined using specimens collected from Saros Bay between January 2009 and December 2009. The length-weight relationship was calculated as W=0.0061TL^3.12 for females, W=0.00691TL^3.08 for males and W=0.0066TL^3.10 for all samples. Growth parameters of the populations were L_∞=37.3 cm, k=0.22 year^-1, t0=-1.93 year for females; L_∞=41.4 cm, k=0.17 year^-1, t0=-2.37 year for males and _L∞=39.0 cm, k=0.20 year^-1, t0=-2.13 year for all samples. It was observed that spawning period occured between June and August. The length at first maturity was estimated as 18.0 cm for all samples. Total mortality rate (Z), natural mortality rate (M), fishing mortality rate (F) and exploitation rate (E) of the chub mackerel were 0.91 year^-1, 0.34 year^-1, 0.57 year^-1 and 0.62 year^-1, respectively. Keywords : Stock structure