Growth, mortality and relative yield per recruit of Japanese scad Decapterus maruadsi (Temminck & Schlegel, 1842) in the Gulf of Suez, Red Sea, Egypt

Mehanna, Sahar; El-Sherbeny, Asaar; Khalil, Magdy; Ahmed, Mahmoud; Kafrawy, Sameh

doi:10.21608/ejabf.2015.2234

Growth, mortality and relative yield per recruit of Japanese scad Decapterus maruadsi (Temminck & Schlegel, 1842) in the Gulf of Suez, Red Sea, Egypt

Document Type : Original Article

Authors

¹ National Institute of Oceanography and Fisheries, Fisheries Division, Fish Population Dynamics Dept., Suez, Egypt.

² Ain Shams University, Faculty of Science, Zoology Dept., Cairo, Egypt

³ National Authority for Remote Sensing and Space Science, Agriculture Applications, Soil and Marine Science Division, Marine Science Dept., Cairo, Egypt.

10.21608/ejabf.2015.2234

Abstract

The stock of Japanese scad Decapterus maruadsi was assessed based on 1864 specimen (combined sexes), collected from the Gulf of Suez during the fishing season 2011/2012. The growth parameters (L∞ & K) have been estimated from length frequency distribution data, and the obtained values were L∞ = 27.31 cm TL and K = 0.53/y. The instantaneous rates of total (Z), natural (M) and fishing (F) mortalities were 1.80, 0.61 and 1.19/y respectively with exploitation ratio (E) of 0.66/y which reflects an over exploitation situation. The estimated length at first capture (Lc) was
12.2 cm, while the length at first sexual maturity (Lm) was 12.3 cm. The relative yield per recruit analysis shows that the stock of D. maruadsi is overexploited and needs to develop a management strategy to conserve and optimize its yield.

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