The invention relates to an extraction method of total
genomic DNA of fish. The extraction method comprises the following specific steps: A, taking the fish tissue containing
DNA, washing,
grinding, and placing into a centrifuging tube; B, adding with Chelex-100 solution, carrying out boiling water bath for 15-20 min, adding with
proteinase K solution, and carrying out water bath at 50-60 DEG C for more then 3h; C, sucking liquid in the centrifuging tube, placing the liquid into another centrifuging tube, and carrying out
centrifugal separation; D, taking the supernate, adding with RNase solution, carrying out water bath at 37 DEG C for more than 45 min; E, adding with
Tris saturated
phenol solution, uniformly mixing, carrying out
centrifugal separation, and taking the supernate; F, adding with a suitable amount of
chloroform and isoamylol
mixed solution, uniformly mixing, carrying out
centrifugal separation, and taking the upper solution; G, adding with
alcohol, and placing for 1h or a longer time; H, carrying out centrifugal separation, and discharging the supernate; I, adding with
alcohol, carrying out centrifugal separation, and discharging the supernate; J, removing the
alcohol, adding with
sterile water, and storing for later use. According to the extraction method, a
reagent is convenient to fetch, the
DNA extraction effect is good, the integrity of
DNA is high, especially the extraction can be carried out by taking scale as the
raw material, and limitation from the quantity of a sample is avoided.