Macrobrachium shrimp are a delicacy enjoyed by many citizens in Puerto Rico. Fishing practices in the island are a sustainability concern due to misinformation and lack of crustacean regulations on the island. There needs to be more information about the Macrobrachium species population in the Puerto Rico streams. Therefore, this study aims to observe the population dynamics of Macrobrachium shrimp in Sonadora Stream, El Yunque National Forest, through the different periods of rainfall in the year. These shrimp species are migratory organisms that use rainfall and river overflow to move across the rivers and reproduce. By quantifying population distribution, density, and elevation-related variables, we expect to observe a more stationary behavior in low rainfall season and more migratory behavior in high rainfall season, where preliminary data has shown a movement with high rainfall periods/days in comparison to sunny days. Long-term monitoring was carried out using visible implant elastomer (VIE) tags, while capture-mark-recapture analysis was utilized to estimate population number and movement. This study helps us better understand Macrobrachium spp. ecology and assist conservation efforts.