The red top koi (confirmed introduction)
The center of the head of the red top koi has a bright red or simple color Color patterns. The best shapes of plaques are round and "shoe-pump" (rounded in front and behind).
1. The number of teeth is very small, arranged in one to three rows on the lower pharyngeal bone
2. There is only a pair of bones around the mouth close to the lower jaw, and there is no adipose fin.
3. Have two pairs of beards. Internal organs:
There are two pairs of beards on the side of the mouth, and their surface contains sensory cells similar to taste buds, which can distinguish taste and thus seek food in the mud; there are no teeth on the edge of the mouth, but there are developed throat teeth, which can taste food.
There are five pairs of gill arcs on the back of the tongue. The outermost gill arc is the so-called gill, which can filter plankton from the water. The four pairs of red gill flaps in front of the gill arcs have gas connection functions. The gill flaps are filled with numerous capillaries, and the back of the tongue is connected to the esophagus. Without the stomach, the esophagus is straight through the intestines, its length is about 5 times the body length and curves in the abdominal cavity. The part close to the esophagus is slightly thicker and contains digestive fluid infiltration glands similar to gastric glands. There is a liver, pancreas and a dark green gallbladder.
The fat is located at the back of the body cavity and is divided into two chambers, the front and back, which are combined with the inner ear through a small bone. The heart is wrapped in the cardiac sac and consists of the atrium and the ventricle, as well as an arterial bulb. There is a general elimination hole at the front end of the anal fin base, which connects the rectum, urethra and gonads. Sperm or eggs are produced in the nest.
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