CATDOLL : CATDOLL: Nutritional value of large scale catfish

1. Nutritional value of large scale palladium fish

Fish is generally low in calories, carbohydrates, fat, and protein.

2. What kind of animal is cod?

A large, cold-water, economically important fish of the family Gadidae, scientifically known as Gadus morhua. Found on both sides of the North Atlantic, it generally inhabits the bottom layer, with distribution extending from the nearshore to the deep sea. It is a valuable edible fish, and its liver can be used to make cod liver oil. It has three dorsal fins, two anal fins, and one palatine barbel. Its body color varies, ranging from light green or light gray to brown or light black, or from dull red to bright red; there are dark spots on the body. The average weight of a captured individual can reach 11.5 kg (25 lb), but the largest can reach 1.8 m (6 ft) long and 91 kg (201 lb). It feeds on other fish and invertebrates. It has a large appetite and is a voracious migratory fish. The bighead cod (G. macrocephalus), found in both the eastern and western North Pacific, is very similar to the Atlantic cod, but is smaller, reaching a maximum of 75 cm (30 in), with a mottled light brown color and a white lateral line. The world's least cold-resistant fish is the Antarctic cod. In the cold water of Antarctica, it can freeze without becoming stiff. It turns out that the blood of this fish contains a component called glycogen, which has a similar effect to the antifreeze of cars.

Antarctic cod lives in the colder waters of the Southern Ocean, and is even found near the Ross Ice Shelf at 82° south latitude. It is about 40 centimeters long and weighs several kilograms. It is short and thick, silver-gray with slightly dark brown spots, has a large head, a round mouth, thick lips, and grayish-white blood without hemoglobin. As an edible fish, it has tender white meat, delicious taste, and high nutritional value. Its unique physiological function is to resist low temperatures, so in addition to being commercially developed as an important resource, Antarctic cod is also highly valued for its antifreeze function.

Research results on fish physiology show that most fish freeze into "popsicles" at -1°C. However, Antarctic cod can live actively at -1.87°C and swim around as if nothing has happened. It turns out that there is a special biochemical substance in the blood of Antarctic cod, called antifreeze protein, which is responsible for the effect.

Antifreeze proteins have an antifreeze effect because their molecules have an extended nature, as if there is a surface area in their structure that is very easy to interact with water or ice, thereby lowering the freezing point of water and preventing the freezing of body fluids. Therefore, antifreeze proteins give Antarctic cod an amazing ability to resist low temperatures.

3. Can the fish sold in the market be kept in fish tanks?

The fish sold in the market can be raised in fish tanks, but you need to understand the methods of fish farming and the additional equipment for fish farming.

4. Where is the natural cod in the storage room of Pet Kingdom?

Food Category

5. Why can the fish sold in the market live longer if diesel is added to them?

What is "diesel fish"? Where does it come from? The reporter first visited several fish stalls in the city's large farmers' markets, and almost every owner knew about "diesel fish". It is said that "diesel fish" has just been "introduced" to our city. It mainly uses diesel to stimulate those half-dead and unable to swim fish to keep them "alive and jumping".

The reporter recently saw a mobile fish truck on Anhe Street selling fresh carp for only 3 yuan for 500 grams. The reporter picked up a fish and smelled it. The fishy smell was faintly mixed with the smell of diesel. "Why does it smell like diesel?" the reporter asked. The female boss hurriedly said, "It's okay, it's probably been on the truck for a long time. Don't bother if you don't buy it."

Experts from the gastrointestinal department of the First Municipal Hospital told reporters that diesel contains a variety of heavy metals, some of which are extremely harmful to the human body. If a person inhales a small amount, he or she will experience vomiting symptoms, and the stomach and intestines will react violently when stimulated, affecting normal functions and making it difficult to recover in a short period of time. Although the diesel content in "diesel fish" is very small, it should not be eaten, let alone for a long time. How can we buy safe fish? According to the staff of the aquatic department, it is best for citizens to buy fish at regular vegetable markets and supermarkets, and don't forget to smell it before buying.