The Eye of the Secret Realm · The Calendar of Human Friends | Calendar: I am the "Big Mac" in the fish

Editor's note:

The wild boar goes down the mountain! "Monkey Paper" to my balcony! The news of wild animals entering the city frequently shows social media. In fact, there are many local wild animals around us, and they are neighbors with us, but we rarely understand them. Understanding, friendly, and accompanying, everything can be raised and raised. Xinhua Daily · Jiaojiao Point Unite Jiangsu Wildlife Protection Station, Jiangsu Forestry Science Research Institute, Nanjing Institute of Aquatic Sciences, Nanjing Hongshan Forest Zoo, etc. launched the "Eye of the Secret Realm · Friends of Humanity" calendar column to take you together Through the perspective of infrared cameras, animal observer, etc., pay attention to the familiar and mysterious "animal neighbors". Biological diversity is the foundation and vitality of human homes. Every solar term, we will also invite solar terms to carry out the special selection and broadcast on the day. Today, come to get to know the catfish together.

Four people's heads

Herbal, giant in the carp family, slender torso, cylindrical shape, exactly like grass carp, but the skin color shows blue and black, so it is called herring. The growth rate of the cattle is fast, the meat is delicious, and the nutritional value is high. Therefore, they are one of the main economic fish species in my country, and they even became the first of the four Chinese fish.

Cycles are the only meat fish in the "Four Fish". Steo, shrimp, mussels, ravioli, waterworms, dragonfly larvae, etc. are their food sources. Herbal is particularly like to eat snails and other shells, because they have pharynx in their mouth, and they can bite hard shells to eat meat with pharynx. Cycles are also called "snail green".

Giant

Cycles are large -sized freshwater fish species. Compared with other fish, the growth rate of the german is much faster. Only 6 winter age is needed, and their weight can exceed 30 pounds. They are called small nuclear submarines by fishermen, whether they are in the wild or "black pit", they are giant in the water.

On September 19, 2004, the Nanjing Golden Niuhu Reservoir captured a large female gorgeos, with a total length of 1.74 meters and a weight of 106 kg, breaking the national record, and the record has remained so far.

Cycles are generally living on the bottom of the water body. Searching prey along the mud of the river and lakes rarely surface. The main reason is that the bottom layer of the water body is rich in snails. They are not like grass carps to grab food crazy, and they usually wait for food to send their own food slowly. The predation process is not panic or Seswin, so they are also called "Xiucai Robe".

Why do people grow less and less?

Cycles have a long history of breeding in our country. But in recent years, people have raised less and less.

The reason is that on the one hand, because the market of the catches is small, the sales are not very large. The catfish is large, and the small ones are more than a dozen pounds and tens of pounds. In addition, the price is high. People spend a lot of money to buy a one home, and they have to eat more to eat. The willingness to buy is reduced, and fishermen have gradually cultivated. On the other hand, the sexual maturity age of herring is high, and the breeding cycle is long. It takes 4 to 5 years in the south to mature. It takes 6 to 7 years in the north with low temperature. The time cost is too high. In addition, under natural conditions, there are few natural bait of catfish, and they need to feed them foods such as shrimp, mussels and snails, and have high economic costs. If the food is insufficient, the breeding cycle of the cattle will become very long, which will make many farmers discourage.

Write: Bai Xue

Beautiful editor: Zhu Danqing

Photo: Nanjing Pecont Porchurium Aquatic Biological Protection Association

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