The reasons that cause mackerel to be more expensive than grass carp are:

Mackerel farming cycle is longer, the meat quality is better than that of grass carp, the number of artificial breeding is small, mainly distributed in the middle and lower reaches of the Yangtze River, mainly eating mussels, clams, snails food, is a kind of non-vegetarian fish, and grass carp is a grass-feeding fish, fast-growing, rapid swimming, and often in groups to carry out foraging, eat less meat, the cost of mackerel farming is high.

The mackerel is a carp, mackerel genus fish. The body length can reach 145 centimeters. Individuals large, up to more than 70 kilograms. Mackerel usually inhabits the lower and middle layers of water and is inactive in nature. Its main food sources are snails, mussels, clams, clams, etc. It also occasionally preys on shrimp and insect larvae.

The grass carp is a fish of the family Carpidae, genus Grass carp. The body is tea-yellow, the abdomen is grayish white, the edge of the scales on the side of the body is grayish black, the pectoral fins and the ventral fins are grayish yellow, and the other fins are light-colored. Grass carp is a typical herbivorous fish, inhabiting the rivers and lakes in the plains, generally preferring to live in the lower and middle layers of the water and the near-shore areas of water plants. It is active, swims fast and often forages in groups. The young grass carp eat larvae, algae, etc. The grass carp also eat some meat, such as earthworms, dragonflies, etc. The fish also eat some meat, such as earthworms, dragonflies.

The difference between grass carp and cyprinids:

1, the difference in food: cyprinids are carnivorous fish, generally like to snail, crab, mussels, shrimp and other animals for food, the action is relatively slow, while the grass carp herbivory, mainly to a variety of aquatic plants for food, usually more active.

2, the shape of the fish scale is different: grass carp and cyprinids are large fish scales, but in the shape and distribution is still different, the grass carp fish scales are very neat, the size of the same than the cyprinids fish scales to be rounded. The scales of the mackerel are larger than those of the grass carp and are not arranged in a regular pattern.

3, the appearance of the difference: the body of the grass carp is slightly cylindrical, the head is slightly flat, tail side flat. The body of the fish is light tea yellow, the back of the greenish gray, the other fins light gray body is longer, the head is more flat, the tail side flat. Cyprinids are long, slightly cylindrical, generally asymmetric, the body is greenish-black, the back is darker; the fins are grayish-black, and the even fins are especially dark.