In this study, length distribution, length-weight relationship, age, growth parameters, and reproduction of 331 Gobius niger collected monthly by trawling in the Sea of Marmara between October 2011-July 2014 were determined. The total length and weight distributions of the population varied from 6.2-14.2 cm and 2.85–36.25 g, respectively. The average length was found 10.28 cm and average weight was found 13.71 g. Black goby was distributed between 0-4 age groups. Otolith length-total length relationship was calculated as OL= 2.337*TL+0.143 (R2=0.76). Length-weight relationship were determined total, female, and male as W = 0.096*L3.084 (R²=0.89); females W= 0.010*L3.042 (R2=0.88); males W=0.005*L3.33 (R²=0.94) respectively. The growth parameters were calculated for the whole populations as L∞=15.31 cm K= 0.36 y-1 t0=-1.77 year, L∞=14.89 cm, K=0.35 y-1, t0=-1.97 year for females and L∞=1 4.65 cm, K=0.45 y-1, t0=-1.39 year for males. The natural mortality rate (M) was calculated as 0.82 year-1, total mortality rate (Z) was 1.33 year-1, and fishing mortality rate (F) was 0.51 year-1. The exploitation rate (E) of population was determined as 0.38 year-1. The first sexual maturity length of G. niger was found L50=9.58 cm. The reproduction period was indicated between March to July.