POPULATION DYNAMICS OF THE ROUND SCAD DECAPTERUS MACROSOA (BLEEKER, 1851), IN THE GULF OF SUEZ, EGYPT. | ||||
| Egyptian Journal of Aquatic Biology and Fisheries | ||||
| Article 4, Volume 3, Issue 2, April 1999, Page 55-68 | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejabf.1999.3417 | ||||
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| Author | ||||
Sahar Mehanna
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| National Institute of Oceanography and Fisheries P.O. Box 182, Suez, Egypt. | ||||
| Abstract | ||||
| Age and growth of Decapterus macrosoma from the Gulf of Suez were studied by otolith-reading method. There is no difference in age and growth between the two sexes. The oldest males and females were 4+years. The mean back - calculated total lengths at the end of different years of life were estimated. The growth parameters of the von Bertalanffy growth equation were K - 0.557 year-1, L= 26.97 cm and to = -0.059 year. The mean instantaneous total mortality coefficient “Z,” computed by two different methods was found to be 1.107 year-1. The natural mortality coefficient, fishing mortality coefficient and exploitation rate were estimated. The yield per recruit was computed using the model of Beverton and Holt (1957). The results indicate that, the D. macrosoma population in the Gulf of Suez is overexploited. | ||||
| Keywords | ||||
| Carangidae; Decapterus macrosoma; Age; Growth; mortality rate; exploitation rate; yield per recruit | ||||
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