Engineering Carassius auratus, also known as Xiangyun crucian carp, is a new triploid fish species cultivated by a technical cooperation group headed by Academician Liu Jun of China Academy of Engineering, using bioengineering technology combining cell engineering and sexual hybridization.

Primary crucian carp: also known as wild crucian carp, primary crucian carp refers to crucian carp native to natural waters, and "fine" crucian carp is artificially introduced or bred by hybridization.

Compared with the growth performance of the original crucian carp, it has the advantages of underdeveloped gonads, strong disease resistance, low oxygen tolerance, low temperature tolerance, wide feeding habits, easy to catch, etc., especially the growth speed is fast, and the engineering crucian carp is three times faster than the ordinary crucian carp; But also has many advantages in commodity characteristics. The meat yield is high, but the meat quality is loose. Some unscrupulous traders will pretend to be wild crucian carp for sale, and the price is 1 times higher than that of ordinary crucian carp.

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