Method for accurately judging dominant species of fishery resources at bottom layer of artificial fish reef area

The invention relates to the technical field of ecological evaluation, in particular to an artificial fish reef area bottom layer fishery resource dominant species accurate judgment method based on a stable isotope technology. The method comprises the following steps: measuring and calculating delta 13CTOC and delta 15NTON values in a sample, respectively taking the delta 13C value and the delta 15N value as horizontal and vertical coordinates, drawing a carbon-nitrogen stable isotope ratio two-dimensional scatter set of each species, drawing a convex polygon of an isotope niche by using a function, calculating the area of the convex polygon and the area of a standard deviation ellipse, and judging dominant species of a community according to the numerical values of the areas. The method can rapidly and accurately determine the fishery resource dominant species at the bottom layer of the artificial fish reef area, and provides guidance for fishery development. 本发明涉及生态评价技术领域，尤其涉及一种基于稳定同位素技术的人工鱼礁区底层渔业资源优势种精准判定方