Fisheries biology and management of Diplodus Sargus Sargus (Linnaeus, 1758) in Abu Qir Bay, Egypt

Fisheries biology and management of Diplodus Sargus Sargus
(Linnaeus, 1758) in Abu Qir Bay, Egypt
Hatem H. Mahmoud*, Amany M. Osman**, Altaf A. Ezzat **
and Adel M. Saleh***
*National Institute of Oceanography and Fisheries, Alex., Egypt.
**Oceanography Department, Faculty of Science, Alex. University Egypt.
*** Faculty of Marine and Fisheries, Red Sea University, Sudan.
[email protected]
Abstract
The present study deals with the fisheries of Diplodus sargus sargus in Abu Qir Bay (Alexandria, Egypt).
Length weight relationship, catch length structure, length scale relationship, total length by the end of each year of
life, growth in weight, Von Bertalanffy parameters, the values of (total, natural and fishing mortalities), survival
rates, length and age at first capture, length and age at recruit, yield per recruit, biomass per recruit, determination of
the biological reference points and the effect of age at first capture on Y/R. Also Cohort analysis (VPA, age based)
which represent the estimated values of the population numbers, Survivors, Natural and fishing mortalities for each
year of life of D. sargus sargus in Abu Qir Bay were studied. The study concluded that, the fisheries status of D.
sargus sargus in Abu Qir Bay reached the target reference point (F0.1) but it did not reach the limit reference point
(Fmax), thus the fisheries status of D. sargus sargus in Abu Qir Bay is not in the overexploited phase.
Keywords: Abu Qir Bay, Fisheries management, B.R.P., Virtual population analysis, Sparidae, Diplodus sargus.