Grouper is more expensive. The retail price of tiger grouper in the market is about 80 per catty, and the market price of mandarin fish is about 50 per catty. The price of grouper ranges from tens to five hundred yuan depending on the type.

Black cat fish is grouper, commonly known by local residents along the coast. Living in the cracks of rocks on the seaside, it is known as the carp in the sea. In fact, its food value and taste are higher than that of carp. More expensive than common fish. Grouper belongs to the order Perciformes, with a long oval body and slightly flat sides. The mouth is large, equipped with an auxiliary maxilla, and the teeth are thin and pointed, and some are enlarged into canines. The body is covered with small comb scales, sometimes buried under the skin. The dorsal fin and anal fin have well-developed spines, the caudal fin is round or concave, and the body color varies greatly, often brown or red, with stripes and spots. It is a large and medium-sized warm-water marine fish.

Mandarin fish, also called croaker, is a carnivorous, scaly fish; it belongs to the Lipidae family in taxonomy. Mandarin fish has flat sides, bulging back, thick body and pointed head. It is one of the "four famous freshwater fishes" in my country. Mandarin fish has tender meat, less spines and more meat. Its meat is in the shape of flaps and tastes delicious. It is really the best fish. The Tang Dynasty poet Zhang Zhihe wrote a famous poem in his "Fishing Song", "Egrets fly in front of Xisai Mountain, peach blossoms flow and mandarin fish are fat", praising this kind of fish.