Length–weight relationships were estimated for four marine species, namely Pomadasys kaakan (Cuvier, 1829), Pampus argenteus (Euphrasen, 1788), Scomberoides commersonnianus Lacepède, 1801 and Euthynnus affinis (Cantor, 1849) in the Gulf of Oman (Konarak, Iran). During nine cruises, samples were collected at 20-miles distance from shoreline by 3 panel drift gill-nets with 120 mm mesh size, 8–9 m height and 0.5 hanging ratio in autumn and winter 2016.