First, cut open the belly of the fish and observe it with your eyes. The hepatopancreas of fish with bad viscera is slightly swollen and light in color. If there is basically no food in the intestine, it means that the fish may have been sick before death, and then check the hepatopancreas, the structure is broken and the color is white. Only bile is darker than usual. What is a fish with intact internal organs? It's simple. The internal organs are bright red, and there are food residues in the intestines.
Related information:
The liver of fish is the core organ to maintain normal physiological functions, and its main functions include: substance synthesis center (protein synthesis, dehydrogenation, transamination and synthesis of ester protein), secretion and excretion function (bile acid production and secretion, promotion of intestinal fat digestion and absorption), detoxification function (removal of harmful substances and residual drugs), and immune function (phagocytosis of microorganisms entering the liver through the intestinal barrier).
The main characteristics of a normal and healthy liver are: ruddy liver (fresh pig liver color) and elastic liver.