From a large scale, there are more than 320 species of triggerfish in 11 families and 92 genera of 4 suborders in the world, which are collectively called "river triggerfish" whether they live in rivers or not, and China produces 106 species in 52 genera of 11 families.

From a small scope, river herring refers to the herring fish living in freshwater, in China, from Liaoning to the coast of Guangdong **** living more than 30 kinds of river herring, the common ones are: the worm pattern oriental herring, the horizontal oriental herring, the lead point oriental herring, the moon bellied herring, the red-finned oriental herring, and the dark pattern oriental herring.

How many kinds of freshwater dolphins are there in the world?

Five species:

Baiji dolphin: distributed in China's Dongting Lake and the middle and lower reaches of the Yangtze River, and also in the Qiantang River.

Lahe dolphin: lives in estuaries on the west coast of the Atlantic Ocean.

Sub-river dolphin: in the Amazon River basin and Orinoco water system in South America.

The Indus Dolphin: lives in the Indus, Ganges, Brahmaputra, and Meghna rivers (in Pakistan, India, Bangladesh, Nepal, and Bhutan).

The Ganges Dolphin is more widespread than the Indo-Pacific Dolphin, and is found in the Ganges, Meghna, and Brahmaputra river basins in western India, Nepal, Bhutan, and Bangladesh, as well as in the Gornopuri River in Bangladesh. It may also inhabit the Sengku River in Bangladesh and the headwaters of the Brahmaputra River in China (Yarlung Tsangpo River).