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255480

Population structure and growth aspects of blue swimming crab, Portunus pelagicus, in Bardawil Wetland, Egypt

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Last updated: 01 Jan 2025

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Abstract

         Based on the growth and population variables, the present study was achieved to evaluate the current status of Portunus pelagicus in Bardawil Wetland, Egypt, providing a basis for sustainable development in the fishery sector. About 4065 specimens of Portunus pelagicus were collected from the catch of trammel net, with a carapace width of 4.2 to 15.6 cm, most of which were medium-sized. The carapace width-weight relationship clarified a positive allometric growth pattern. The overall mean value of the condition factor (5.3) revealed a good condition and suitable habitat. The estimated sex ratio was 1:1.05 for males and females, respectively, which varied insignificantly from the expected ratio of 1:1 (X2, P > 0.05). Three age groups (0+, 1+ and 2+ year) were estimated in which each age group individuals constituted about 11.7, 82.7 and 5.5% of the population, respectively. Von Bertalanffy growth parameters were CW = 16.6cm, K = 1.4 y-1, and t0 = - 0.918. The 1st capture (CWc) was detected with a carapace width of 7.80 cm. 4.68 y-1, 2.25 y-1 and 2.43 y-1 were the estimated values of total (Z), natural (M) and fishing mortality, respectively. The highest value of fishing mortality compared to the biological reference points; Fopt= 1.125 and Flimit= 1.50 y-1; indicates overexploitation, which was confirmed by the exploitation rate of 0.57. The predominance of Portunus pelagicus may refer to the leak presence of natural predators, which are heavily exploited. Restoring the biological balance is an urgently required step.

DOI

10.21608/ejabf.2022.255480

Keywords

blue swimming crab, population structure, Growth aspects, Bardawil Lake

Authors

First Name

Tamer A.

Last Name

El-Betar et al.

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Volume

26

Article Issue

4

Related Issue

35549

Issue Date

2022-07-01

Receive Date

2022-08-19

Publish Date

2022-07-01

Page Start

885

Page End

903

Print ISSN

1110-6131

Online ISSN

2536-9814

Link

https://ejabf.journals.ekb.eg/article_255480.html

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https://ejabf.journals.ekb.eg/service?article_code=255480

Order

52

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Original Article

Type Code

103

Publication Type

Journal

Publication Title

Egyptian Journal of Aquatic Biology and Fisheries

Publication Link

https://ejabf.journals.ekb.eg/

MainTitle

Population structure and growth aspects of blue swimming crab, Portunus pelagicus, in Bardawil Wetland, Egypt

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Article

Created At

22 Jan 2023