Body coloration and patterns are distinctive external morphological features in animals, significantly contributing to survival and reproduction. This investigation quantified individual variation in body surface patterns of male paradise fish ( Macropodus opercularis ) by analyzing standardized photographs of 42 individuals. Using ImageJ software, body area parameters—including total area, body area, and fin area—as well as stripe parameters such as number, area, height, and width, were extracted and statistically evaluated. Results indicated the highest coefficient of variation in pectoral fin area and the lowest in stripe number. Both the total area and body area showed significant positive correlations with the stripe number, total stripe area, total stripe height, and total stripe width ( p <0.05). These findings suggest that increased lateral body area in male paradise fish is relatively synchronized with overall growth, serving as a visual signal relevant to ecological adaptation and sexual selection, likely through signal amplification in mate choice.