Dataset for "Population Dynamics and Seasonal Recruitment of Armatus Barb (Cyclocheilichthys armatus) in Relation to Hydrological Variability in a Tropical Reservoir"

This dataset contains monthly length-frequency data of Cyclocheilichthys armatus collected from Lam Pao Reservoir, Thailand, together with monthly rainfall and reservoir storage data for 2024. Fish sampling was conducted monthly from January to December 2024 at nine sampling stations. The dataset supports analyses of population dynamics, growth, mortality, recruitment patterns, and seasonal recruitment in relation to hydrological variability. The repository contains two primary data files: (1) monthly length-frequency data for C. armatus and (2) monthly hydrological and environmental data, including rainfall and reservoir storage. A README file provides the dataset description, data dictionary, units, data sources, and guidance for data use.