The puffer fish, also known as halibut or halibut, has a flat body and two eyes on one side of the body. It usually lies flat on the bottom of the sea. Usually, the fish and shrimp in the ocean are the staple food, and they come out for food at night. This kind of fish has high nutritional value and excellent health care effect, which is of great benefit to maintaining human health.

Life habits of drum-eyed fish

All adult flounder are benthic fish, but their eggs contain oil droplets and float near the sea surface. In a few days, the eggs will hatch, and the hatched young fish are symmetrical in shape, with two eyes on the side of the top of the head and mouth on the ventral line, which further shows that they evolved from Perciformes.

When the juvenile fish grows to about 1 cm, it will deform and change, which will have a great influence on the symmetrical skull and eventually form the asymmetric flounder we see. The whole change begins with one eye moving to the other side of the fish head, which is realized by the resorption of cartilage strips on the skull.

Similarly, the nostrils also move to the side with two eyes or the colored side. The mouth and eyes of PARALICHTHYS olivaceus in other families moved to the same plane, except rhabdomyosarcoma. The form of eye movement is also a typical feature of some special subjects.

For example, the fishes of the family Haliotidae and the family Haliotidae are called "left-eyed Haliotidae", because their right eyes are usually active, so the colored side facing upward is the left side. Flounder is a "right-eye flounder" because their left eye usually moves, and finally their right side will face up. In Octopodidae, the number of right-eye and left-eye flounders is the same.

When these remarkable changes occur, the young fish sink to the bottom of the sea. Flounder has no swim bladder, so they always lie on or near the bottom of the sea with their eyes down. Adult PARALICHTHYS olivaceus has different body shapes-European PARALICHTHYS olivaceus and its related species have almost the same length and width, while Cynoglossus has a long and narrow body shape.

Usually flounder will bury themselves on the beach or crawl in a winding way, exposing only their eyes and upper gills. The gill cavity is connected with the outside world through special channels. Water is inhaled from the mouth through the gill cover, and exhaled water is discharged to the outside through a special channel in the buried gill cavity.