The mackerel is one of the common freshwater fish, commonly known as mackerel, grass carp, Wuqing, Wu mixed, black mixed and so on.

Because of the snail is also known as snail green, snail mix, in the folk green fish is also often called the ghost fish, life fish, there are two main reasons, one is that the green fish is often anglers dragged into the water or even drowned, and the second is the rise of the water in order to pick up the poor people green fish often drowned.

The mackerel is the carp family mackerel genus of large freshwater fish, due to the body color more green-gray and named, in fact, the mackerel genus mackerel is only one species, China in addition to the Tibetan Plateau in addition to the Yangtze River, the Pearl River, the Yellow River, the Huaihe River, the Heilongjiang River, and other major waterways are distributed, especially in the south of the Yangtze River in the distribution of the most centralized plains, the distribution of the Yangtze River north of the distribution of a relatively small number of places.

The mackerel is stout, nearly cylindrical, with a rounded abdomen, no ventral ribs, a head generally smaller than the body height, a wide dorsal fin on the back located above the ventral fin, no hard spines, an anal fin that is medium-long, a ventral fin that is opposite to the beginning of the first or second dorsal fin, a shallowly forked caudal fin, upper and lower lobes that are about equal, and a greenish-gray body color, with a darker back, an off-white abdomen, and all fins that are black.

Habits of the bluegill:

1. Benthic: The bluegill is a benthic fish, generally swimming, feeding and roosting on the bottom layer of the water, but the bluegill will also go to the middle and lower layers or the middle and upper layers of the water when the temperature is high, to swim and feed.

2. Carnivorous: Cyprinids are carnivorous fish, mainly feeding on mollusks such as snails, mussels, clams, clams, etc. They are especially fond of snail meat, and occasionally they also feed on shrimps, aquatic insects and larvae.

3, variable temperature: mackerel is a variable temperature fish, optimal survival temperature of 25 ~ 32 ℃, feeding critical temperature of 7 ~ 40 ℃, the water temperature is higher than 7 ℃ lower than 40 ℃ can maintain a certain desire to eat.

4. Migratory: Cyprinids are migratory fish, generally fattening in large waters such as lakes and reservoirs, swimming to the middle and lower reaches of rivers in late autumn and early winter to overwinter, and then backtracking to the middle and upper reaches of rivers to spawn in the spring of the following year.