Stock Analysis, Critical Lengths and Exploitation Status of the Gilthead Seabream, Sparus aurata (Linnaeus, 1758) in the Mediterranean Sea off Alexandria, Egypt
et al., E. (2024). Stock Analysis, Critical Lengths and Exploitation Status of the Gilthead Seabream, Sparus aurata (Linnaeus, 1758) in the Mediterranean Sea off Alexandria, Egypt. EKB Journal Management System, 28(4), 1791-1806. doi: 10.21608/ejabf.2024.375188
El-Samman et al.. "Stock Analysis, Critical Lengths and Exploitation Status of the Gilthead Seabream, Sparus aurata (Linnaeus, 1758) in the Mediterranean Sea off Alexandria, Egypt". EKB Journal Management System, 28, 4, 2024, 1791-1806. doi: 10.21608/ejabf.2024.375188
et al., E. (2024). 'Stock Analysis, Critical Lengths and Exploitation Status of the Gilthead Seabream, Sparus aurata (Linnaeus, 1758) in the Mediterranean Sea off Alexandria, Egypt', EKB Journal Management System, 28(4), pp. 1791-1806. doi: 10.21608/ejabf.2024.375188
et al., E. Stock Analysis, Critical Lengths and Exploitation Status of the Gilthead Seabream, Sparus aurata (Linnaeus, 1758) in the Mediterranean Sea off Alexandria, Egypt. EKB Journal Management System, 2024; 28(4): 1791-1806. doi: 10.21608/ejabf.2024.375188

Stock Analysis, Critical Lengths and Exploitation Status of the Gilthead Seabream, Sparus aurata (Linnaeus, 1758) in the Mediterranean Sea off Alexandria, Egypt

Egyptian Journal of Aquatic Biology and Fisheries
Article 106, Volume 28, Issue 4, July and August 2024, Page 1791-1806  XML PDF (1020.76 K)
Document Type: Original Article
DOI: 10.21608/ejabf.2024.375188
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Author
El-Samman et al.
Abstract
The gilthead seabream Sparus aurata is a commercially significant fish species in the Egyptian Mediterranean fishing areas. The present study was directed to evaluate the stock status of S. aurata fishery from Alexandria fishing ground, Egypt. The data were collected from January to December 2022, and a total of 834 specimens were measured for length-weight and length-frequency distribution. The forked length (FL) ranged from 13.3 to 32.5cm, and the weight varied from 47.2 to 640.9g. Based on otolith readings, the growth and death rates were determined. The age composition of S. aurata comprises of six age groups from I to V plus age group zero. The length-weight relationship for combined sexes was W = 0.0225 L2.96 (R2 = 0.95) showing an isometric growth. The von Bertalanffy growth parameters were 𝐿∞ = 40.5cm, K = 0.236/ year, and tο = -0.47 year.  However, total mortality (Z), natural mortality (M) and fishing mortality (F) were 1.45, 0.55 and 0.90 year-1, respectively. The exploitation ratio (E) was computed as 0.622, which is higher than the limit point (> 0.5) indicating that the stock of S. aurata is experiencing an overexploitation state. Critical lengths of this species were calculated giving that Lm was highly greater than Lc, forming  another evidence for the overfishing situation. It may be suggested that particular management actions should be taken to conserve the stock of this fishery at a sustainable level for the forthcoming generations.
Keywords
Mediterranean Sea; Sparidae; Population dynamics; Stock status; Management
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