Black herring, also known as black pomfret, is covered with large scales. It looks like grass carp, but its scales and fins are gray-black. Hence the name herring. The scales are big and thick. Its tail is thinner than grass carp. Dorsal fin, pectoral fin, ventral fin and caudal fin are longer and harder than grass carp.
Grass carp is long and delicate, with bluish yellow body color and slightly white abdomen. The scales are big and thick. Its dorsal fin, pectoral fin, ventral fin and caudal fin are smaller and shorter than herring. Rivers and lakes inhabiting the plain prefer to live in the middle and lower layers of water and coastal areas with many aquatic plants.
Silver carp is flat, slightly tall, spindle-shaped, with blue-gray back and white sides and abdomen. The pectoral fin does not exceed the base of the ventral fin. Fins are gray. The head is bigger. Eye position is very low.
Bighead carp is also called silver carp, silver carp, silver carp, silver carp, Baotou fish, bighead carp, herring, hemp fish, and some are also called male fish. Bighead carp grows in freshwater lakes, rivers, reservoirs and ponds. Most of them are distributed in the middle and upper layers of water. All major water systems in the eastern plain of China have output.
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Black herring inhabits the bottom of the water, and its staple food is mollusks such as snails and mussels and aquatic insects. Grass carp likes to move around the water and feed on aquatic plants. Silver carp lives in the upper layer of water and feeds on phytoplankton. Bighead carp also likes to move in the upper water and feed on zooplankton.
From the late Yin Dynasty to the Tang Dynasty, carp was the object of fish farming in China. In the Tang Dynasty, because the emperor surnamed Li, Li carp was homophonic, and carp symbolized the royal family, so it was necessary to avoid "carp", which could not be caught or sold.
In this case, fishermen are forced to find new breeding objects, namely green grass, silver carp and bighead carp. Because of their different feeding habits and habitat habits, these four kinds of fish are very suitable for mixed culture in a pond and have great breeding benefits, so they have become traditional cultured fish in China.