1, the nutritional value is different: tilapia meat is tender, good taste, which contains a lot of protein, amino acids, calcium, iron and other nutrients, after eating, can relieve eye fatigue, improve eyesight, while the crucian carp's protein content is high, less fat, amino acid content is high, the fish is more fine and soft, it can be strengthened and stomach, tonifying the middle and benefiting the qi.

2, the fins are different: the body type of tilapia and crucian carp are similar, but the fins are very different, the dorsal fin of tilapia is very long, the caudal fin is fan-shaped, swimming speed, eating ability, while the dorsal fin of crucian carp is relatively short, the fish body is smooth.