Age structure and growth dynamics of the endemic Algerian barbel, Luciobarbus callensis (Valenciennes, 1842) in Foum El Khanga Dam, northeastern Algeria

This study provides initial insights into the age structure and growth patterns of the Algerian barbel, Luciobarbus callensis (Valenciennes, 1842), in Foum El Khanga Dam (Northeastern Algeria). For this purpose, a monthly sampling was conducted throughout 2024, yielding a total of 185 specimens (129 males and 56 females). Subsequently, age was estimated using scalimetric analysis, and growth was described via the Von Bertalanffy model. Results revealed six age classes (1–6 years), among which individuals aged 3 and 4 years were the most frequent, accounting for 34.59% of the sample. Total lengths ranged from 24.20 to 55.70 cm, with a predominance of the [30–35] cm size class. Regarding growth modeling, the estimated parameters were L_∞ = 58.63cm, K = 0.39 year⁻¹, and t₀ = -0.35. In addition, the length–weight relationship exhibited negative allometry (b = 2.30), indicating that linear growth outpaces weight gain in this environment. In conclusion, these findings establish a preliminary biological baseline for this endemic cyprinid. Despite the localized nature of the study, these data offer a necessary scientific starting point for future monitoring and the management of fish resources in the region’s artificial reservoirs.