The main differences are, different body shape, different size, different caudal fins, different mouths, as follows:

I. Different body shape

1, Koi Carp

Koi Carp has a slender body, which is more like a rolling pin.

2, koi carp

Koi carp body is short and wide, the distance from the backbone to the abdomen is relatively large, an exaggeration of a bit like a racket.

Two, different sizes

1, koi carp

The same adult fish, koi carp is much larger than the koi carp, koi carp can grow to more than 1 meter.

2. Carp

Same as the adult fish, koi carp is much smaller than koi carp, koi carp up to 30 centimeters is already considered "giant".

Three, the caudal fins are different

1, koi carp

General koi carp have shorter caudal fins.

2, koi carp

Koi carp caudal fin is generally very long, flowing (special circumstances, there are varieties of koi with long caudal fins and short-tailed koi carp).

Four, the mouth is different

1, koi carp

Koi carp mouth facing down, the mouth has two pairs of different length of whiskers.

2. Koi Carp

Koi Carp's mouth faces forward, and there are no whiskers on its mouth.

Baidu Encyclopedia - Brocade Carp