CRISPR/Cas9 is the powerfulpopular genome editing technology which can recognize target gene by a single guide RNA with the advantages of precision, high efficiency, easy manipulation,low cost to be applied to promote the precision breeding of aquatic organisms. The potentials of genome editing in the precision breeding of ornamental fish are mainly focused on infertility control, alternation of colorshape, growth promotion, sex control, stress tolerance, virus resistance, etc.