The tail of a fish serves two purposes, one is to provide forward momentum and the other is to control the direction of swimming. For fish, the tail fin is far more important than the other fins, losing the other fins will affect the fish's balance, but after losing the tail fin, it will not be able to turn for the rest of its life. In addition, some fish have beautiful looking tails, or they are a great tool for attracting the opposite sex so that they can pair up better for breeding.

Expanded:

Fish can be categorized into fish and saltwater fish if they are classified according to the type of water, and the following is a look at some of the common types.

1, the grass carp

distributed all over the street, is omnivorous, soft, like warm and cold water, activity in the water in the lower region, adaptability, ice areas, there will be grass carp traces. Grass carp is also a freshwater fish that anglers like very much, the meat is tender and the nutrients are relatively high, but there are more thorns.

2, crucian carp

Wide range, river Wulin ponds, canals and baylets, small bubbles, grass ponds, all of which are active areas. Fujian Province, Yunnan Province, Jiangxi Province, Guangdong Province, Zhejiang Province, China Taiwan, Southeast Asia and other places are attributed to its habitat, it has more than a dozen kinds of similar, fishing can be daily life for three days, the meat is tender, is famous for the world's food.

3, bream

In China's eastern and southern China are many areas of its habitat is the island of reproduction, often active in the lower layer of the water, like warm water, tend to light, carnivore freshwater fish, Fujian Province, Zhejiang Province, Jiangxi Province, Hunan Province, Hubei Province, Sichuan are its figure, bream meat is delicate, nutritious.

4, grouper

In China there is a wide range all over, activities in the water under the layer, East China, South China, most of the East China region is the indoor space where it survives, like the temperature of cold water, carnivore freshwater fish, love to eat the carrion, sexual ferocity, full of force, East China South China, Taiwan, Southeast Asia are all over the.?