Population assessment of greater amberjack Seriola dumerili along the Syrian waters in the eastern Mediterranean Sea using expert systems

Over a period of six months spanning from September 2023 to March 2024, researchers collected a total of 224 random samples of Seriola dumerili from the Syrian waters in the eastern Mediterranean Sea. These samples were subjected to advanced analysis techniques, including artificial neural networks and fuzzy logic. The largest individual captured during the study measured 165 cm in total length and was estimated to be 15 years old. By applying the von Bertalanffy growth equation to the total length data, researchers derived the formula TLt = 182.5 (1-e-0.09 (t + 1.887)), which indicates negative allometric growth (b = 2.70). The growth performance index (Φ') was calculated as 3.48, providing a measure of growth efficiency. The study also estimated various mortality coefficients for S. dumerili. The coefficients were as follows: Z = 0.54 y-1 (total mortality rate), F = 0.34 y-1 (fishing mortality rate), M = 0.20 y-1 (natural mortality rate), and E = 0.63 y-1 (exploitation rate). The survival coefficient (S) was determined to be 0.58 y-1. Analysis of the population growth of S. dumerili from the Syrian coast, with a fishing pressure (FP) value of 60, indicated a substantial growth pattern within the local marine environment. However, the study also revealed a high fishing vulnerability, with a vulnerability value of 72.7 FV. This vulnerability poses a significant threat to the fish population along the Syrian waters. The findings of this study provide valuable insights into the population dynamics of S. dumerili in the Syrian waters’ region. They underscore the importance of implementing conservation measures for the sustainable management of this species. Additionally, the results enhance our understanding of S. dumerili 's growth, mortality, and vulnerability to fishing, paving the way for future research and management strategies.