1, species: horse mackerel belongs to the order Scleractinia, order Perciformes, family Spanish mackerel, while blue jimmies belong to the order Scleractinia, order Perciformes, family Mackerel.

2. Appearance: Mackerel has a blue or green back, a lighter belly, obvious oval spots on the side of the body, long dorsal and anal fins, and a well-developed caudal fin. The back of the Green Zambezi, on the other hand, has a darker blue color with a slight silvery sheen, five black horizontal stripes on the side of the body, relatively short dorsal and anal fins, and a forked caudal fin.

3, meat and taste: horse mackerel's meat is tighter and tastes better, while the meat of bluegill is coarser and tastes less good than horse mackerel.

4, price and use: the price of horse mackerel is relatively low, mainly for food, but also can be processed into snacks canned or salted dried fish. The price of green Jim fish is relatively high, in addition to food, can also be processed into snacks canned or air-dried dried fish, in addition to its liver can also be refined cod liver oil.