Koi fish Anatomy

 Koi Organs

 The koi has two pairs of moustaches of which epidermis contains sensory cells. They can tell the taste and help the koi seek food in the mud.

 The jaw has no Teeth but developed pharyngeal teeth break food.

 Behind the tongue there are five pairs of Saiko. Inside four pairs of those five, Saiha line like the teeth of a comb. The Gill covers them.

There are eighteen Saiha, each of which has fifteen processes. They leach out plankton form water. A wide but short Esophagus is Connected to them.

There are vertical wrinkles in it and an opening to the Air Bladder on one side of it.

The koi has no stomach, but the esophagus is directly connected to the intestines.

They are about five times as long as the body and are coiled twice in the abdomen. A part of the intestines just after the esophagus is slightly swollen, which has a secreting gland of digestive fluid. The part works as a stomach. 

 One organ functions as both the liver and the pancreas. on the right side there is a dark green gallbladder, a spleen is surrounded by all the internal organs. 

 The air bladder is on the side of the koi's back and has two ventricles. It is also connected to the internal ears by deformed vertebrae.  Inside the gill cover  there is  five pairs of Saiko, of which four have red gill filaments for respiration. A net of capillaries spreads all over the gill filaments.

The koi's heart is wrapped by the pericardium, having an atrium, a ventricle and artery. In front of the anus to which the rectum, the ureter and the gonads are connected. In the gonads spermatozoa or ova are produced.

This information has come from Takeo kuroki

.