Population Dynamics and Exploitation Status of Merlangius merlangus (Linnaeus, 1758) in the Sea of Marmara

Merlangius merlangus is a species of notable economic significance. In this study, its population parameters-including length-weight relationships, age structure, growth patterns, and mortality rates-were assessed in the Sea of Marmara. Samples were collected using trawl nets at 34 stations between March 2017 and December 2018. A total of 4,978 specimens were analyzed, with total lengths ranging from 5.0 to 26.7 cm and weights from 2.03 to 167.3 g. The length-weight relationship indicated isometric growth across the population. The length distribution of age-determined individuals were 6.4-24.2 cm in total length. These data were used in the calculation of growth parameters. The estimated asymptotic length (L infinity) was 24.65 cm, the growth coefficient (K) was 0.34 year(-)(1), and the theoretical age at zero length (t(0)) was - 1.27 years. Individuals were aged between 0 and 4 years, and the maximum estimated lifespan (tmax) was 5.5 years. Mortality parameters were also calculated, revealing an exploitation rate (E) of 0.55 per year, suggesting considerable fishing pressure on the stock.