What is the nutritional value of flounder? Why are flounder's eyes on one side?

There are many species of flounder, and they are distributed in many parts of the world. They usually live in tropical to cold waters, and a few live in fresh water. Fresh flounder is a valuable edible fish, with tender meat and few fish bones. It is suitable for steaming or braising, and is usually canned. Its liver can also be used to extract cod liver oil. If you want to know more about the nutritional value of flounder, you can go to Encyclopedia Knowledge Network!

Contents of this article

1. What are the nutritional values ​​of flounder?

2. What does flounder look like?

3. Why do flounders have their eyes on one side?

What are the nutritional values ​​of flounder?

Flounder is a precious seafood, produced in temperate waters along the coast, with Qinhuangdao and Beidaihe being the best. The appearance of flounder is different from other fishes. Its two eyes are on the same side. It usually lies on its side. The side facing up has eyes and color, while the side facing down has no eyes and no color. The color of the side facing up can change with the color of the environment. Flounder is rich in nutrients such as protein, vitamin A, vitamin 140D, calcium, phosphorus, potassium, etc., especially vitamin B6, but less fat. In addition, flounder is also rich in DHA, the main component of the brain. Regular consumption can enhance intelligence. Flounder has the effects of removing dampness, promoting blood circulation and unblocking meridians. The unsaturated fatty acids contained in it are easily absorbed by the human body, which helps to lower blood cholesterol and enhance physical fitness.

What does flounder look like?

The body of the flounder is long and flat. The body of the adult fish is asymmetrical, and the eyes are only on one side of the body. It has a unique asymmetrical structure among fish. The body shape of a newly born flounder is the same as that of a normal fish, with two eyes on both sides of the top of the head and a mouth on the midline of the abdomen. As the young fish grows up, one eye gradually moves to the top of the head and then to the other side, and the mouth gradually twists until the adult flounder permanently lies on one side on the seabed.

Flatfish is a general term for fish of the order Pleuronectiformes. Flatfish do not have a swim bladder, so they always lie on the seabed or near the seabed with the side without eyes facing downward. Flatfish usually bury themselves by hitting the sand or by meandering, leaving only the eyes and upper gill cover exposed. The gill cavity is connected to the outside world through a special channel, and water is inhaled from the mouth through the gill cover, and exhaled water is discharged to the outside through a special channel in the gill cavity on the buried side.

Why do flounders have their eyes on one side?

When the little flounder just hatched from the egg, it was no different from other fish, with two eyes growing neatly on both sides of its head. However, when it lived for about 20 days and its body grew to 1 cm, it could no longer swim normally due to the imbalance of its parts, and had to lie on its side at the bottom of the water. Its eyes began to move at this time. The growth of its two skull bones was uneven, especially the frontal bone, which was more prominent. The eye at the bottom of the body moved upwards, passing through the spine and reaching the top, and was parallel to the original eye because of the continuous growth of the soft band under the eye. At this time, its orbital bone was formed, and the position of the eye would no longer move. In fact, flounders, like other fish, all live alone. Its two eyes grew to one side because this fish has gradually adapted to the environment after many generations. Flounders live on the seabed for a long time, so its two eyes are on the top, which is very beneficial for it to find enemies and catch food.