BIOLOGICAL STUDIES ON THE ATLANTIC MACKEREL FISH Scomber scombrus OF EASTERN MEDITERRANEAN (NORTH SINAI COAST)
EGYPT DURING 2016
Gaber D. I. H.1; Mohamed S.A1.
Attia A.O.EL-Aiatt2 and Shymaa A. A.1
1El Arish university.
2National Institute of Oceanography and Fisheries NIOF.
Received 4/ 10/ 2018
Accepted 6/ 11/ 2018
The goal of the present study is to give basic information required for managing Atlantic mackerel Scomber scombrus L 1758 of Eastern Mediterranean (North Sinai Coast) Egypt. 2423 Samples of Atlantic mackerel Scomber scombrus L. 1758 (12.3 to 32.6 cm total Length and 8.6 to 259.2 gm total weight), were collected during 2016. The relationship between length and weight was W= 0.0088L3.0407. Age was determined by otolith where age groups 1 to 5 years. Growths in length and weight at the end of each year were calculated as 16.2,19.73,22.76,25.1 and 27.01cm for the 1st, 2nd, 3rd, 4th and 5th year of life respectively. The growth parameters of von Bertalanffy equation were calculated as (L∞= 35.51 cm, K = 0.2053 year-1 and t0 = -1.9661 year). Growth performance index (φ′ = 2.413). Mortality rates were 0.9651 yr−1, 0.2945 yr−1 and 0.471yr−1 for total, natural and fishing mortality respectively. The currently exploitation rate E = 0.55. The length and age at first capture (Lc) (Tc) was 19.6 cm and 1.94 years respectively. In the end, 54.1% of the total fish catch of fish Atlantic mackerel is small and this affects the fish stocks of these fish and must not fishing until this fish to the maturity, also these fish are important in north Sinai as the catch from these fish reached 75 tons per year and their prices are affordable