The family Haliotidae includes red square fish, white square fish, yellow square fish, fox square fish and fine square fish. There is an inverted triangular silver-white band under the eyes of the red square fish. There is no mark below the yellow longitudinal band of caudal fin. Red-headed fish dig holes at the bottom of sediments with a water depth of 20-160m to nest and eat benthos. The spawning period is May-June. Its meat tastes mild, but it is delicious in sauce or dried fish. The body length is generally 25-35 cm, and the big one can reach 45 cm. Distributed in South China Sea of China and south of central Honshu Island.

Among the square head fish, the red square head fish has the largest number and the largest catch. Generally, large insect bait or shrimp is used, and boat fishing is used. When fishing, first choose the fishing spot at the bottom of the sediment, and let the boat drift with the waves while fishing. The lead pendant should be made to roll on the bottom of the water, so that the bait can enter the nest of the square head fish. It is difficult to catch square fish unless bait is sent to the fish nest.

The biggest and most delicious square head fish is white square head fish. But this kind of fish is small in number and rarely caught. The yellow flatfish looks like the red flatfish, but it lives in the deeper sea floor. This kind of fish is not big, and its taste is not as good as that of red square head fish.

The foxtail perches on the sandy seabed around coral reefs or rocky reefs, which is a very popular rare ornamental fish species. It digs holes under rocks to build nests and eats benthos. Body length is 30-45 cm. Distributed along the coast of Japan, south of Ryukyu Islands; Hawaii, Red Sea, South Africa, Indian Ocean and Western Pacific.

Square head fish, like fox, is also a rare species, with a body length of 25-30 cm. Distributed in Hawaii, South Africa, Indian Ocean and Western Pacific Ocean, as well as Japan's coastal areas.