Not the same, two kinds of fish.

Difference:

I. Different names:

1. Dragonfish

Chinese name dragonfish, alias, cow tongue, sub plate fish, tongue fish.

2. Flounder

Chinese name for partial mouth fish, alias, flounder, plaice.

Second, the appearance of different characteristics:

1, Longley fish

Longley fish is also known as pedal fish, cow tongue fish, sole, dragon half-smooth tongue sole. Half-smooth tongue sole body dorsoventrally flattened, tongue-shaped. Scales are small, dorsal and anal fins are continuous with the caudal fin, none of the fins are branched, no pectoral fins, only the eye side with a ventral fin, connected to the anal fin by a membrane and the caudal fin is pointed at the end. The difference between male and female individuals is very large.

2. Flounder

The body is ovoid, laterally compressed, with a narrow caudal peduncle. Both eyes are located on the right side of the head, and the upper eye is located on the median line of the head periostracum. The mouth is large, anterior, and symmetrical. Eyed side mostly covered with weak pectinate scales, occasionally interspersed with rounded scales. Eyeless side covered with round scales. Lateral line almost straight. Dorsal fin begins on eyeless side. The pectoral fins are longer on the eyed side. The caudal fin is truncate.

Three, the habits of life are different:

1, the dragonfish

The dragonfish is a warm temperate offshore large demersal fish, with a wide range of temperatures, wide salt and adapt to changing environmental conditions, the temperature range of 3.5-32 ℃, the optimum temperature of the water 14-24 ℃, the salt range of 14-33 ‰. The most suitable water temperature is 14-24℃, and the suitable salt range is 14-33‰.

2, flounder

Offshore cold-temperature bottom fish. Winter habitat in the water depth of 60-80 meters, some in the depth of 180-270 meters can be seen.

Baidu Encyclopedia-Longley Fish

Baidu Encyclopedia-Marginalized Fish

Baidu Encyclopedia-Semi-smooth Tongue Sole