"Select a normal and healthy carp, crucian carp and silver carp fish, with a body length of 20-30cm and a weight of 250-300g, dissect and wash for later use, make a standard curve with sugar content as abscissa and absorbance as ordinate by anthrone colorimetry, cut off 5g of epidermis and skeletal muscles of the three fish, mash them in a mortar, add clear water and stir them to obtain filtrate, and then use anthrone method to make a filtrate for each fish.

Each healthy cultured carp, crucian carp and silver carp with normal anatomy is washed with a body length of 20 cm-30cm and a body weight of 250 g-300g, and the sugar content measured by anthrone colorimetry is taken as the abscissa, and the absorbance is the standard curve of Y axis; 5, three kinds of fish with skin and fishbone removed are taken respectively, and after mashing, clear water is added to a mortar, and the filtrate is stirred, and the average absorbance is measured after the same treatment with anthrone.

Finally, find out the corresponding sugar content according to the standard curve. The results showed that the sugar content of crucian carp was the highest. The sugar content of carp is second; Silver carp is the lowest.

Finally, the standard curve tracks small advantages according to the number of sweets. The results showed that the sugar content of crucian carp was the highest; The sugar content of carp ranks second; The smallest silver carp.

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