Population dynamics and fisheries management of penaeus semisulcatus exploited by shrimp trawl of Bardawil lagoon, north Sinai, Egypt

Abstract EN

Based on length frequency data, growth, mortality, exploitation rates and relative yield per recruit were examined for Penaeus semisulcatus collected from Bardawil lagoon for two fishing seasons 2010-2011.

A total of 2451 specimens were collected between April through December of the two fishing seasons were measured for carapace length from 26 to 62 mm.

The von Bertalanffy growth parameters were identified (L∞ = 53.5 & 66.7 mm, K= 0.92 & 1.1 year-1, and t0 = -0.154 & -0.022 years of males and females respectively).

The growth performance index (φ′) was 3.42 for males and 3.69 for females.

Total (Z: 3.24 & 5.34 yr-1), natural (M: 1.05 & 1.16yr-1) and fishing mortality (F: 2.18 & 4.17 yr-1) for male and female respectively.

Exploitation rates (E) = 0.67 for males, and (E) = 0.78 for females indicated that the population of P.

semisulcatus is heavily exploited.

Length at first capture (Lc) equal 32 and 39.6 mm of male and female.

According to the relative yield analysis per recruit, for P.

semisulcatus stock in Bardawil lagoon is overexploited.

Thus, the reduction of fishing efforts or re-evaluation of mesh sizes for bottom trawl fisheries are highly recommended.