Freshwater fish
Freshwater fish are not Not only can they be classified according to their salt concentration, they can also be classified according to the areas where they are distributed. Freshwater fish in different areas also have their own characteristics.
1. Heilongjiang District
Including the Heilongjiang, Pidanjiang and Heisuli, Tumen and Yalu river basins. The important fish groups in the area are cold-resistant species.
2. Northwest Plateau Region
This region includes Xinjiang, northern Tibet, Inner Mongolia, Qinghai, Gansu, Shaanxi, Shanxi and other places. The area is mainly highland or flat, and the fish that rest there all have special suitable conditions, such as drought and alkali tolerance, or the ability to live at the bottom of rapids, so there are relatively few species. Although each genera in this area is the least among all areas, However, there are some special bead genera that meet the existing conditions and have many varieties, becoming the dominant group. For example, there are about 70 species of Schizothorax subfamily and 110 species of Loach subfamily, which are private species in the capital area.
, and there are thousands of lakes of different sizes such as Poyang Lake, Dongting Lake, Taihu Lake, Chaohu Lake, etc. Because of its flat terrain and slow water flow, the most suitable characteristics of the important fish are that the general shape is that the body is flat on the side, the head and tail are pointed, and slightly Spindle-shaped, with well-developed thorax, abdomen, buttocks and tail fins. The most common species and genera of Cyprinidae are scattered in this area, such as carp, crucian carp, bream, grass carp, green carp, silver carp, bighead carp, red-eye trout, tuna, bream, catfish, bream, trevally, drift fish, wheat ear fish, copper fish , stick fish, squid, etc. Not only are there a large number of carp species in this area, but the individual yields of their species are also very abundant. It can be said to be the growth center of the carp family in Asia.
4. Dongying District
This area includes Guangdong, Guangxi, Hainan, eastern Yunnan, Guizhou, Fujian, Taiwan and other places. Most of the fish in the area belong to the subtropical zone that likes warmth. , hot wearing fish. Fish in this area live in high mountains and rivers. Due to the rapid water flow, most of the fish living in this area have suckers on their mouths or chests to survive in the rapids. This area is characterized by a large number of species of thermophilic organisms. The composition of its fish community is similar to that of Vietnam, Thailand, Myanmar, and India. Its representative species are mainly Danya of the family Cyprinidae.Family, Loach subfamily, Loach subfamily, Loach family, Loach family, Siboidae, Siboidae, Miscanthus family, Trichodermaidae, Bearded Loach family, Loach family, Trichodonidae, etc.
5. Nulan District
This district is the area where the Yarlung Zangbo River, Nu River, Lancang River, and Jinsha River flow, including southern and eastern Tibet, western Sichuan, and Yunnan west. The rivers in the area all flow in the north-south direction, so the fish from the Dongying District and the Northwest Highlands District coexist in this area through the exchange of river water. For example, species such as the Loach subfamily and the Loach family of the Loach family, the genus Catharidae of the family Loach family, the family Catridae, and the family Catidae, the mixed-branched eel, and the black snakehead of the family Chandae are similar to the Japanese region; while the Schizothorax subfamily Species such as Loach subfamily and Loach subfamily are similar to those in the northwest plateau area. The mixture of fish from the two areas is a characteristic of the fish fauna in this area.
</p>
</p>