Dynamical parameters and relative yield per recruit of the Japanese anchovy Engraulis japonicus (Schlegel, 1846) in the Gulf of Suez, Red Sea, Egypt
F. Mehanna, S., S. H. El-Sherbeny, A., H. M. Ahmed, M., B. El Kafrawy, S., T. Khalil, M. (2020). Dynamical parameters and relative yield per recruit of the Japanese anchovy Engraulis japonicus (Schlegel, 1846) in the Gulf of Suez, Red Sea, Egypt. EKB Journal Management System, 24(1), 399-405. doi: 10.21608/ejabf.2020.71123
Sahar F. Mehanna; Asaar S. H. El-Sherbeny; Mahmoud H. M. Ahmed; Sameh B. El Kafrawy; Magdy T. Khalil. "Dynamical parameters and relative yield per recruit of the Japanese anchovy Engraulis japonicus (Schlegel, 1846) in the Gulf of Suez, Red Sea, Egypt". EKB Journal Management System, 24, 1, 2020, 399-405. doi: 10.21608/ejabf.2020.71123
F. Mehanna, S., S. H. El-Sherbeny, A., H. M. Ahmed, M., B. El Kafrawy, S., T. Khalil, M. (2020). 'Dynamical parameters and relative yield per recruit of the Japanese anchovy Engraulis japonicus (Schlegel, 1846) in the Gulf of Suez, Red Sea, Egypt', EKB Journal Management System, 24(1), pp. 399-405. doi: 10.21608/ejabf.2020.71123
F. Mehanna, S., S. H. El-Sherbeny, A., H. M. Ahmed, M., B. El Kafrawy, S., T. Khalil, M. Dynamical parameters and relative yield per recruit of the Japanese anchovy Engraulis japonicus (Schlegel, 1846) in the Gulf of Suez, Red Sea, Egypt. EKB Journal Management System, 2020; 24(1): 399-405. doi: 10.21608/ejabf.2020.71123

Dynamical parameters and relative yield per recruit of the Japanese anchovy Engraulis japonicus (Schlegel, 1846) in the Gulf of Suez, Red Sea, Egypt

Egyptian Journal of Aquatic Biology and Fisheries
Article 27, Volume 24, Issue 1, January 2020, Page 399-405  XML PDF (703.3 K)
Document Type: Original Article
DOI: 10.21608/ejabf.2020.71123
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Authors
Sahar F. Mehanna; Asaar S. H. El-Sherbeny; Mahmoud H. M. Ahmed; Sameh B. El Kafrawy; Magdy T. Khalil
Abstract
Pelagic fishes, caught by purse seine in the Gulf of Suez, represent up to 65 % of the total annual fish production from the Gulf (GAFRD, 1999-2012), hence they contribute to a major fishery in Egypt. The most represented pelagic fish species in the purse seine catch are; anchovy, carangids, clupeids and scombrids. The population dynamical parameters of Japanese anchovy Engraulis japonicus are estimated based on 4086 specimen (3.1 – 10.4 cm TL), collected from the Gulf of Suez during the fishing season 2011/2012. The growth of this species is positive allometric based on the b-value of length weight relationship. From the length frequency distribution analysis, the population parameters were: asymptotic length L∞ = 12.27 cm TL, growth coefficient K = 0.66/y, total mortality Z = 2.58/y, natural mortality M = 1.00/y, fishing mortality F = 1.58, exploitation ratio E = 0.61/y, length at recruitment Lr = 3.1 cm TL, length at first capture Lc = 6.1 cm TL and length at first sexual maturity Lm = 5.9 cm TL. The high values of both F and E reflect the over exploitation situation. The relative yield per recruit Y’/R analysis shows that although the maximum Y’/R achieved at higher E (0.71) than the current one, the E value which will conserve 50% of the spawners is much lower (0.36). From the management point of view, the exploitation level of Japanese anchovy stock should be reduced by at least 30% to conserve and optimize its yield.
Keywords
Gulf of Suez; Engraulis japonicus Small pelagic fishes; Japanese anchovy; Population dynamics; Management
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