حساب نسب العضلات الحمراء والبيضاء في أسماك القاروص بساحل مدينة مصراتة، ليبيا

Abstract

The current study included calculating the ratios of red and white muscles in Dicentrarchus labrax, which is a bony fish belonging to the family (Moronidae). Samples for the study were collected from the port of Misrata in the (Qasr Ahmed) area, and the results showed a clear difference in the ratios of red and white muscles for the studied fish in three different regions of the body: the first behind the head (R1), the second in front of the dorsal fin (R2), and the third near the caudal peduncle (R3). The red muscle ratios were lower than the white muscle ratios, with the overall average for red muscle ratios ranging from (0.3-1.7%), while the overall average for white muscle ratios ranged from (86.32-97.16%). The results also indicated that the red muscle ratios increased towards the posterior region near the caudal fin (R3), due to their important functional role associated with swimming mechanics. Meanwhile, the white muscles increased in the regions (R1) and (R2) and decreased towards the (R3) region. Based on the current results and the ratios of white and red muscles in the muscle tissue of the studied fish, which reflects their motor activity, D. labrax can be considered a member of the sprinter fishes, and is of the fighting type. It uses white muscles for sudden movements needed for rapid bursts and escaping enemies, while red muscles are used for regular swimming and endurance.