Left-mouthed fish belong to Chordata, Actinidia, Flaveria; Duobao fish belongs to Chordata phylum, bony fish and abalone.

2. Different morphological characteristics

Left-mouthed fish is very flat, rectangular, oval or long-tongued, with a maximum length of 5 meters. Adult fish are asymmetrical left and right. Both eyes are located on the left or right side of the head. The mouth is a little protruding. Fins usually have no fins. The dorsal fin and the anal fin are longer at the base, and are connected or not connected with the caudal fin.

Duobao fish is very flat, rectangular, oval or long tongue-shaped. Young fish's eyes are on both sides of the body, and adult fish's body is asymmetrical left and right. One eye gradually turns left or right, and the two eyes are located on the left or right side of the head. The mouth is a little protruding. Fins usually have no fins. The dorsal fin and the anal fin are longer at the base, and are connected or not connected with the caudal fin.

The eyes of Duobao fish are in the upper part of the body, and the color of this side matches the surrounding environment very well; Their lower parts are white. There are fine scales on the body surface.

3. The distribution range is different.

Left-handed fish are widely distributed in warm and hot waters of various oceans.

Duobao fish is mainly produced on the east coast of the Atlantic Ocean. It is a rare low-temperature economic fish and one of the precious fish species unique to the Northeast Atlantic.

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