Some population parameters of the Mediterranean horse mackerel [(Trachurus mediterraneus (Steindachner, 1868)] population living in Band？rma Bay, The Sea of Marmara

A total of 1232 horse mackerel T.mediterraneus (Steindachner, 1868) were collected from Band？rma Bay, Sea of Marmara between September 2013 and December 2015 in order to evaluate some information on length-weigth frequencies, age-sex distribution and ratios, Von Bertalanffy growth equation, length-weight relationship, condition factor feeding of this species. The population was composed of five age-classes (I-V) .Of 1232 specimens, female was of 33.87% and male % 66.13% with sex ratio as F:M=0,51: (p>0.05). Total length and total weight of sampled fish ranged from 9.77 to 17.6 cm and 5.67 to 44.0 g., respectively. Length-weight relationship and the von Bertalanfy growth parameter were estimated as W = 0.044L2.470, Lt=18.6[1-e0.24(t-3,3) ]), respectively. Besides, growth performance index (？) of this species were determined as 4.4 for all individuals, As condition factor value was examined, it was determined that the highest value in CF reached in June. The spawning period of T. mediterraneus occurred between April and Eylül with a peak in July. Absolute fecundity- total length relationship was estimated as F = 1.368xTL2.75. It was estimated that total (Z) mortality , natural (M) mortality, and fishing (M) mortality rates were of Z=1.36 year-1 ,M=0.33 y？l-1, F=1.03 y？l-1. As exploitation rate was estimated as E=0.76, it can be said that the population was consumed highly