Abstract
A total of 1334 Trachurus trachurus was collected the Western Coast of Libya from February 2019 to February 2020, fish ranged in total lengths from 100 to 360 mm and weighted from 13 to 409g. The growth of T. trachurus .as positive allometry, but it was a significant difference between males and females, whereas females were larger than males. 109 full stomachs of T. trachurus .ere examined to define the prey. The Prey-Specific Index of Relative Importance (PSIRI%) was calculated for phylum and classes. The analysis indicates that the fish stomachs contain 4758 individual prey items classified into six phyla and four classes. The main food item was Decapoda (shrimp and crab) and the trophic level of T. trachurus is 2.98. The changes of the food composition of T. trachurus were related to growth, sex, gonad stages, and seasons. The results reveal that no differences have been considered, this species is an omnivore consuming a wide variety of invertebrate prey with a preference for animal material.