The present invention relates to an algorithm by which a fish abdominal position for vaccine injection is determined based on morphological measurement data including the total length (TL), the body width (WL), and the weight (W) of the fish. More particularly, according to the fish vaccine injection position following algorithm of the present invention, abdominal position and shape including a linear distance (ML) from a mouth end portion to the abdomen, the length of the abdomen (AL), and the width of the abdomen (AW) are detected through fish X-raying and weight center point coordinates of an injection area where an internal organ is absent are obtained with the ML line being the x axis and the AW line being the y axis. Then, the coordinates are deduced into an equation using TL, TL and WL, or TL, WL, and W as variables, that is, morphological injection position coordinates. According to the present invention, the injection position following can be more accurate than in the related art in which the correlation between the total length and the body width of the fish and the like are analyzed for morphological injection position following based on an injection position manually marked on an outer surface of the fish body by an injection specialist. Also, according to the present invention, damage to the internal organ attributable to the vaccine injection can be minimized. In addition, the present invention can be effectively applied to various types of automated vaccine injection devices, including the automated vaccine injection devices of the related art in which a vision system and a rectangular coordinates robot are used.본 발명은 어류의 전장(TL)과 체폭(WL)과 무게(W)를 포함하는 형태학적인 측정데이터를 바탕으로 하여, 백신접종이 요구되는 어류의 복강위치를 결정토록 한 알고리즘에 관한 것으로서, 더욱 상세하게는 어류의 X-ray 촬영을 통하여 주둥이 끝단부에서 복강까지의 직선거리(ML)와 복강의 길이(AL)와 복강의 폭(AW)을 포함하는 복강의 위치와 형태를 파악하는 한편, 상기 ML라인을 x축으로 하고, 상기 AW라인을 y축으로 하여 내장 기관이 존재하지 아니하는 접종영역의 무게중심점 좌표를 구한 다음, 해당 좌표를 TL 또는 TL과 WL 또는 TL과 WL과 W를 변수로 하는 방정식, 즉 형태학적 접종위치 좌표로 도출
