This study investigates the opening force required for shucking farmed oysters to support the development of automated oyster-shucking systems. Oysters sourced from Yeosu and Tongyeong were tested for shell length, width, height, total weight, meat weight, and opening force. Results showed an average opening force of 8.1 kgf for one-year-old Yeosu oysters, 7.4 kgf for one-year-old Tongyeong oysters, and 8.7 kgf for two-year-old Tongyeong oysters, with correlations to shell width, height, and meat weight depending on production sea area and growing age. These findings highlight production sea area and growing age-based differences in oyster characteristics, contributing foundational data to advancing automation in oyster shucking.