An object of the present invention is to provide a zebrafish individual identification method that is non-invasive, capable of easily and reliably identifying an individual. SOLUTION: Each individual of two or more zebrafish (Daniorerio) is laterally observed for the stripe pattern of the tail fin and tail fin, and the characteristics of each individual are determined from the observed stripe pattern, and each individual is based on the determined characteristics. A method for identifying zebrafish individuals. [Selection] Figure 1【課題】非侵襲的で、簡便かつ確実に個体を識別できる、ゼブラフィシュの個体識別方法を提供する。【解決手段】２匹以上のゼブラフィッシュ（Daniorerio）の各個体の尻びれ及び尾ひれの縞模様を側面観察し、観察した縞模様から各個体の特徴を決定し、決定した特徴に基づいて各個体を識別する、ゼブラフィッシュの個体識別方法。【選択図】図１
