CATDOLL : CATDOLL: What kind of fish is the black spotted flat fish?

1. What kind of fish is the black spotted fish and flat fish?

It is a round turbot. It is a freshwater fish belonging to the carp family. Turbot is mainly distributed in rivers and lakes in southern China, such as the Yangtze River, Pearl River, Huaihe River, etc. Turbot is small in size, usually between 10-15 cm in length, with an oval body and a slightly arched back. The back and sides are gray-brown, the abdomen is white, and there are many black spots on the body, especially on the head and dorsal fin. Turbot is a common ornamental fish and also an important economic fish.

2. Why do some turbot have spots and some don't? Which one tastes better?

When buying turbot, the uglier the better. The prettier and fuller-looking turbot actually has a substance called malachite green added to its feed. Like Sudan red, it is extracted and invented by scientists. It is a dye. But after the turbot eats it, its body color will turn green and look better. But if people eat such a fish, there will obviously be risks.

3. Can you eat turbot if it has a black belly?

It is better not to eat turbot if its belly is black, because there must be some bad reasons for the black color. For your own health, don’t eat it if you can.

4. Is there a difference between turbot and flounder? How to choose fish when buying?

Turbot is also a type of flatfish. Because of its diamond-shaped body, its scientific name is turbot. It is native to Europe and belongs to the cold-water fish. The so-called flatfish is a large category, but what we usually refer to is the brown flounder, also known as the side mouth, left mouth, and tooth slice. This fish is produced in the Yellow Sea and Bohai Sea. It has a long and narrow body.

Most of the fish sold on the market now are fresh fish. Try not to buy frozen dead fish, especially small-sized fish, most of which are diseased fish. When buying fresh fish, the best quality ones are fish weighing more than 2 kilograms. In foreign countries, no one eats fish weighing less than 2 kilograms. However, due to consumption levels, the best-selling ones are 1 to 1.5 kilograms. When choosing fish, pay attention to their fatness, and for flounder, pay attention to whether they are damaged.

【flounder】

Flatfish, also known as flounder, is a general term for fish of the order Pleurotiformes of the class Osteichthyes. The body is very flattened, and is oblong, oval or long-tongued, with a maximum body length of 5 meters. The body of an adult fish is asymmetrical. Both eyes are located on the left or right side of the head. The mouth is slightly protruding. The fins generally have no fin spines. The base of the dorsal and anal fins is long, and is connected to the tail fin or not. It is widely distributed in the warm waters of the oceans and mainly feeds on benthic invertebrates and fish. There are many species, with more than 540 species in the world and 120 species in China. The main categories are flounder, sole, sole, tongue sole, etc., which are economic fish.

They live on the sandy bottom of shallow seas and prey on small algae and betta shrimps. They are particularly adapted to bottom-dwelling life on the seabed. Because of their flat bodies. Both eyes are on the upper side of the body, and the color of this side matches the surrounding environment well; the lower side of their body is white. The surface of the flatfish's body is covered with very fine scales. Flatfish has only one dorsal fin, which extends almost from the head to the tail fin. They mainly live in temperate waters and are important economic fish in temperate waters.

the difference:

Flatfish, also known as flounder, is a general term for fish of the order Pleurotus. The body is very flattened, oblong, oval or long-tongued, and can reach a maximum length of 5 meters. The body of an adult fish is asymmetrical.

Both eyes are located on the left or right side of the head. The mouth is slightly protruding. The fins are generally without fin spines. The base of the dorsal and anal fins is long and connected to the caudal fin or not.

Widely distributed in the warm waters of all oceans, they mainly feed on benthic invertebrates and fish. There are many species, with more than 540 species in the world and 120 species in China. The main categories are flounder, sole, sole, tongue sole, etc. They are economic fish.

Ichthyologists say that the flounder's strange shape is not innate. The eyes of newly hatched flounders are also born on both sides. When they grow to about 3 cm long, their eyes begin to "move". The eye on one side moves to the top of the head, gradually crossing the upper edge of the head and moving to the other side until it is close to the other eye.

The living habits of flounder are very interesting. When swimming in the water, it does not swim with its back upward like other fish, but swims sideways with the side with its eyes facing upward.

It often lies flat on the seabed, with a layer of sand covering its body, leaving only its two eyes exposed to wait for prey and avoid being preyed on. In this way, the advantage of having two eyes on one side is revealed, which is of course the result of animal evolution and natural selection.

Selection:

When buying fish, we should first choose fish that are lively and jumping, because if the fish is lively and jumping, it means that the fish is healthy. And when buying fish, we should try to choose fish with complete scales and no defects, because this kind of fish is fresher.

When buying fish, you should also pay attention to the gills. If the gills are bright red, it means the fish is relatively fresh and not lacking in oxygen. If the gills are dark red, it means the fish is somewhat lacking in oxygen and is not very fresh. After the fish dies, the color of the gills will turn white.

When buying fish, try to choose live fish. If we find small insects on the fish or other parts of the fish when buying live fish, we'd better not buy such fish, because such fish may have parasites such as schistosomiasis. If we do not cook the fish for enough time or do not cook the fish thoroughly, we may suffer from schistosomiasis or other diseases after eating.

When choosing live fish, try to pick those with brighter colors, because the water quality in which such fish live is better and less polluted, and the fish's bodies contain fewer substances that are harmful to our bodies, making it safer for us to eat them.

When buying fish, if there are no live fish, we can choose fresher fish from some dead fish. First, we need to smell the fish with our nose. If it is a fish that has been dead for a long time, especially in summer, it will emit a very unpleasant odor. We'd better not buy such fish because the fish may have been infected with putrefactive bacteria.

When buying dead fish, try to buy some nearly fresh fish. We can press the fish's body with our fingers. If the fish meat is hard, it means the fish has just died. If the fish has been dead for too long, we can also see the fish meat and fish bones separated. It is best not to buy such fish, otherwise it will affect our health after we use it.

Appearance characteristics

The maximum length of an adult turbot can reach 75cm. The body is very flat and oval. Its eyes are on the left side of the head. Not only does it look peculiar, but the turbot also contains rich colloid under the skin and on the edge of the fins. The head and tail fin are small, and the fin rays are cartilaginous. There are no small bones in the body, and the bones are white jade-like. The internal organs are small, the meat yield is high, and the muscles are thick and tender. The desert flounder is similar to the Chinese brown flounder in appearance. The body is flat and oval. Both eyes are located on the left side of the head. The left side of the body is light brown with irregular spots. The color of the abdomen is lighter and can change with the surrounding environment so as to hide the body and avoid enemies. The turbot is nearly round; the side with eyes (dorsal) is blue-brown with dotted melanin and a small amount of skin spines, and the side without eyes (ventral) is white; there are also faintly visible black and brown patterns on the body surface, and the muscles are thick and tender.

Living habits

In the natural environment, turbot is carnivorous in feeding habits. Juveniles feed on crustaceans, while adults prey on small fish and shrimps. Under artificial breeding conditions, after domestication, they are mainly fed with high-energy granular feed.

Feeding habits: In natural waters, the desert flounder has the ability to ambush prey. The fry mainly feed on crustaceans. As the fish continue to grow, they gradually feed on various fish, usually including spotted mullet, striped mullet, white mullet and grass shrimp. In intensive farming, it is easy to tame it and feed on compound feed (for example: puffed fish feed, etc.).

Habitat

Turbot is a cold-water fish in Northern Europe, which has strict requirements on seawater parameters such as temperature. The highest lethal temperature of turbot is 28-30℃, the lowest lethal temperature is 1-2℃; the highest growth temperature is 21-27℃; the lowest growth temperature is 7-8℃; the optimum growth temperature is 14-17℃, and its maximum tolerance to salinity is 40‰; the lowest is 12‰.

Distribution

Turbot is mainly produced on the east coast of the Atlantic Ocean. It is a valuable low-temperature economic fish and one of the unique and valuable fish species on the northeastern Atlantic coast. Its natural distribution ranges from Iceland in the north to the European coast near Morocco in the south. It is relatively produced in the waters near the North Sea, the Baltic Sea, Iceland and the Scandinavian Peninsula.

It is naturally distributed along the European coast on the east side of the Atlantic Ocean, commonly found in the North Sea and the Baltic Sea, from the waters of 68° north latitude away from the coast of Iceland in the north, along the coast of the Scandinavian Peninsula southward, all the way to 30° north latitude away from the coast of Morocco.

It is also distributed along the Black Sea and the Mediterranean coast, mainly in the North Sea, inhabiting sea areas with a depth of 20 to 70 meters and sandy, gravel or mixed bottoms. It has the advantages of adapting to low water temperatures, fast growth, good meat quality, and great breeding and market potential, and has successively become one of the excellent marine aquaculture fish developed by European countries. It was introduced to China in 1992 and has now become an important aquaculture species along the northern coast of China.

The flounder is long and thin, while the turbot is more like a fresh mushroom, flat, so it is called a turbot.

A flounder.

Understand it.

When choosing, just smell it to see if there is any peculiar smell. There are few live ones. If it is frozen, pay attention to the edge of the fish body to see if there is any damage.