Length-based estimates of growth parameters and population structure of Siganus rivulatus (Forsskål, 1775) from the Gulf of Suez, Red Sea, Egypt
Osman et al., H. (2024). Length-based estimates of growth parameters and population structure of Siganus rivulatus (Forsskål, 1775) from the Gulf of Suez, Red Sea, Egypt. EKB Journal Management System, 28(1), 339-351. doi: 10.21608/ejabf.2024.338215
Hanan M. Osman et al.. "Length-based estimates of growth parameters and population structure of Siganus rivulatus (Forsskål, 1775) from the Gulf of Suez, Red Sea, Egypt". EKB Journal Management System, 28, 1, 2024, 339-351. doi: 10.21608/ejabf.2024.338215
Osman et al., H. (2024). 'Length-based estimates of growth parameters and population structure of Siganus rivulatus (Forsskål, 1775) from the Gulf of Suez, Red Sea, Egypt', EKB Journal Management System, 28(1), pp. 339-351. doi: 10.21608/ejabf.2024.338215
Osman et al., H. Length-based estimates of growth parameters and population structure of Siganus rivulatus (Forsskål, 1775) from the Gulf of Suez, Red Sea, Egypt. EKB Journal Management System, 2024; 28(1): 339-351. doi: 10.21608/ejabf.2024.338215

Length-based estimates of growth parameters and population structure of Siganus rivulatus (Forsskål, 1775) from the Gulf of Suez, Red Sea, Egypt

Egyptian Journal of Aquatic Biology and Fisheries
Article 17, Volume 28, Issue 1, January and February 2024, Page 339-351  XML PDF (743.6 K)
Document Type: Original Article
DOI: 10.21608/ejabf.2024.338215
View on SCiNiTO View on SCiNiTO
Author
Hanan M. Osman et al.
Abstract
Siganus rivulatus is an economic species that has been proven to move from the Red Sea to the Mediterranean region via the Gulf of Suez and its vital canal. Clarifying the current status of this species in the Gulf of Suez is the goal of the current study. 1161 individuals (10-24 cm of total length) were collected and examined during the 2022 fishing season from Attaka fishing harbor, Suez. The distribution of length frequency indicated the predominance of small sizes (12 and 13 cm). Body weight and length indicated an isometric growth pattern. Body girth and length were found to be correlated significantly with a linear relationship (r2= 0.824). The overall mean value of the condition factor (1.25) referred to a suitable habitat for growth. Four age groups were observed where 65% and 33.7% of the population belonged to the first and the second age groups, respectively. Von Bertalanffy growth parameters were estimated as 29.2 cm, 0.373y-1 and -0.902y-1 for L¥, K and t0, respectively. The growth performance index (Ø= 2.50) expresses a good fit for habitat. Mortality coefficients indicated a high value of fishing mortality (F=1.62 y-1), exceeding the biological reference points. The length at first capture (14.90 cm) was less than that of first maturity (17.90 cm) and the optimum length (17.71 cm). The exploitation rate's value (E= 0.69) confirmed the state of over-exploitation. The study recommended tightening control over landing points, preventing the fishing of illegal sizes, and also reducing fishing effort with a rate of 46.4% to preserve the stock.
Keywords
Siganus rivulatus; Age; Growth; Exploitation rate; fisheries management; Gulf of Suez
Statistics
Article View: 187
PDF Download: 300