Half a catty of crucian carp is generally about 2 1 cm in length. Wild crucian carp grows slowly in the natural environment, but sometimes the crucian carp in the market grows very fast, weighing up to half a catty or more, and its body length may also exceed 2 1 cm. However, this fast-growing crucian carp is usually not as healthy as the slow-growing wild crucian carp.

In addition, crucian carp in different areas may have slightly different body shapes and weights, so it is impossible to determine the weight and body length of wild crucian carp.