ISSN: 2577-4050
Authors: Nader IH* and Nour AAB
The research on Gymnura altavela in the Syrian coastal region revealed that 18 distinct age groups were among the 67 specimens captured. The second age group was the most dominant, comprising 26.87% of the population. The largest recorded disc width was 134.66 cm in an 18-year-old specimen. The species exhibited negative allometric growth with a coefficient of 2.91, and a growth performance index (Φ’) was 3.63. The mortality coefficients were estimated as follows: Z= 0.51 year-1, F= 0.11 year-1, M= 0.40 year-1, and E= 0.22 year-1, with a survival coefficient (S) of 0.60. The population growth (FP= 42.9) indicates moderate growth in the coastal environment. However, the species faces a significant threat due to a fishing vulnerability score of 59 FV. This study offers valuable insights into the population dynamics of Gymnura altavela in the Syrian coastal region and emphasizes the importance of conservation measures to ensure sustainable management. The findings contribute to our understanding of the species’ growth, mortality, and susceptibility to fishing, providing a foundation for future research.
Keywords: Gymnura altavela; Fussy Logic; Artificial Neural Network; Exploitation
