This study investigates the variation and interdependence among 20 morphometric characters of the Sciaenid fish Johnius dussumieri from Ponnani, on the southwest coast of India. Pearson correlation analysis revealed strong positive correlations between most of the characters, indicating coordinated growth. Simple linear regression analyses further confirmed significant linear relationships between total length and the remaining characters. Standard length exhibited the strongest linear relationship with total length (R² = 0.976) and the highest growth rate (b = 0.886). In contrast, caudal fin length showed the weakest relationship (R²=0.312), and the lowest growth rate was recorded for second anal spine length (b = 0.081). A single principal component, PC1, was extracted, accounting for 80.58% of the total variance, and primarily representing overall body size and shape. These findings reflect strong morphometric integration and provide a valuable baseline for future stock assessment and population studies of J. dussumieri, as no existing studies on the species' morphometrics are available.